무료 온라인 도구

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JSON Formatter

Format, minify & validate JSON data HOT 🗜

JSON Minifier

Remove whitespace to compress JSON 🔄

JSON to YAML

Convert JSON to YAML format 🔄

YAML to JSON

Convert YAML to JSON format 📊

JSON to CSV

Convert JSON arrays to CSV tables 📋

CSV to JSON

Convert CSV tables to JSON arrays 📄

XML Formatter

Format, minify & validate XML data 🔄

XML to JSON

Convert XML structure to JSON 🔄

JSON to XML

Convert JSON to XML structure 🌐

HTML Formatter

Format and beautify HTML code 🎨

CSS Formatter

Format and minify CSS code ⚡

JS Formatter

Format and minify JavaScript code 🗃

SQL Formatter

Format complex SQL queries HOT 🔐

Base64 Encode/Decode

Encode and decode Base64 strings HOT 🖼

Image Base64

Convert images to/from Base64 🔗

URL Encode/Decode

Encode and decode URL strings HOT 🏷

HTML Entity Escape

Encode/decode HTML special entities 🔠

Unicode Escape

Escape and unescape Unicode chars #️⃣

Hex Encode/Decode

Convert text to/from hex strings 📝

Markdown Preview

Live render Markdown to HTML 📋

TOML Formatter

Format and validate TOML config 📦

Protobuf Viewer

Parse and format Protobuf messages 📦

MessagePack Viewer

Parse MessagePack binary format 📦

CBOR Viewer

Parse and display CBOR binary data 📋

Bencode Decoder

Decode BitTorrent Bencode format 📋

INI Formatter

Format and validate INI config ⚡

GraphQL Formatter

Format GraphQL schemas and queries 🔐

PEM Certificate Decoder

Parse PEM format SSL certificates 🎫

JWT Deep Inspector

Deep inspect JWT structure & expiry 📋

JSONL Formatter

Validate and format JSON Lines 🔄

TOML to JSON

Convert TOML config to JSON 🔄

YAML to TOML

Convert YAML config to TOML 📊

XML to CSV

Batch convert XML data to CSV ⚙

Nginx Config Validator

Check Nginx config syntax errors 📄

.env File Formatter

Format and validate .env files ✅

OpenAPI Validator

Validate OpenAPI/Swagger specs 🔍

JSON Deep Diff

Visualize nested JSON differences 🔐

Base32 Encode/Decode

Encode and decode Base32 strings 🔠

UTF-8 Encoder Analyzer

Analyze text UTF-8 byte sequences 🗜

HTML Minifier

Compress HTML, strip comments 🌐

Punycode Converter

Encode/decode internationalized domains NEW

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MD5 Hash

Generate MD5 hash of text HOT 🔒

SHA1 Hash

Generate SHA1 hash of text 🔒

SHA256 Hash

Generate SHA256 hash of text 🔒

SHA512 Hash

Generate SHA512 hash of text 🔒

SHA3 Hash

Generate SHA3-256 hash of text 🔑

HMAC Generator

Generate HMAC auth codes with key 🔑

Bcrypt Hash

Generate and verify bcrypt hashes 🔐

AES Encrypt/Decrypt

AES symmetric encrypt and decrypt 🎲

UUID Generator

Generate v1/v4/v5 standard UUIDs HOT 🎲

ULID Generator

Generate sortable ULID identifiers 🎲

Nano ID Generator

Generate compact random string IDs 🔑

Password Generator

Generate secure random passwords HOT 💪

Password Strength Checker

Check password security strength ⚖

Hash Compare

Compare two hash values for match 🎫

JWT Decoder

Parse and display JWT token content HOT 🎫

JWT Generator

Generate JWT with custom payload NEW 🔢

OTP Generator

Generate TOTP/HOTP one-time codes 🗝

API Key Generator

Generate secure random API keys 🔑

RSA Key Generator

Generate RSA 2048/4096-bit key pair 🔐

PGP Key Guide

PGP public key encryption guide 📜

X.509 Certificate Decoder

Parse X.509 certificate details 🔑

Argon2 Hash Generator

Generate secure Argon2 password hash 🔢

Two-Factor Auth Guide

TOTP/HOTP 2FA implementation guide 🔑

SSH Key Generation Guide

Ed25519/RSA SSH key generation guide 🔢

Checksum Generator

Generate CRC32/MD5/SHA checksums 📊

Entropy Calculator

Calculate Shannon information entropy

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Text Diff

Visually compare two text fragments 📊

Character Counter

Count characters, words and lines HOT ✂

Text Deduplicator

Remove duplicate lines from text 🔤

Text Sorter

Sort text lines alphabetically 🔍

Regex Tester

Live test regex pattern matches HOT 🔡

Case Converter

Batch convert text case styles 🐍

Camel/Snake Case Converter

Convert camelCase/snake_case/kebab 🔄

ROT13 Cipher

ROT13 text encryption/decryption 📊

Word Frequency Counter

Count word occurrence frequency •—

Morse Code Converter

Convert text to/from Morse code 🔐

Text Escape/Unescape

Escape/unescape HTML, JS, JSON text ↔

Text Reverser

Reverse string or line order 📄

Text Wrapper

Wrap text at character/word count ✂

Text Trimmer

Remove extra spaces and blank lines 🔍

Text Extractor

Extract URLs, emails, numbers 📝

Text Template

Variable replacement template tool 📄

Lorem Ipsum Generator

Generate Lorem Ipsum placeholder 📝

Chinese Lorem Ipsum

Generate Chinese placeholder text 💰

Number to Chinese Words

Convert numbers to Chinese words 📊

Advanced Text Stats

Paragraph, sentence & word stats ✂

Text Truncator

Truncate text and add ellipsis ☁

Word Cloud Data

Build word frequency data for clouds 📖

Readability Score

Compute Flesch readability score 📊

Sentence Counter

Count sentences by punctuation 🔊

Syllable Counter

Count syllables in English text 🔐

Simple Text Cipher

Simple ciphers like Caesar cipher 🐷

Pig Latin Converter

Convert English to Pig Latin 💻

Leet Speak Converter

Convert text to/from 1337 speak 📄

HTML to Plain Text

Strip HTML tags to plain text 🔗

Text to URL Slug

Convert title to URL-friendly slug 🎲

Random Word Generator

Generate random English words 🔑

Passphrase Generator

Generate memorable passphrases 🔄

Palindrome Checker

Check if text is a palindrome 🔤

Anagram Checker

Check if two words are anagrams 📧

Email Subject Tester

Score email subject line quality 📌

Punctuation Guide

English punctuation rules guide ✍

Writing Style Guide

Technical writing style reference 📖

Readability Formulas

Flesch-Kincaid formula reference 📊

Pro Text Statistics

Advanced vocabulary diversity stats 📋

Content Brief Template

SEO content brief template 📰

Headline Formulas

High-click headline formulas 🔍

SEO Copywriting Guide

SEO keyword copy techniques 📚

English Grammar Guide

Common English grammar reference 🔍

Regex Pattern Library

Curated regex pattern collection 🔄

Traditional/Simplified Chinese

Convert Traditional/Simplified Chinese NEW 🔤

Fullwidth/Halfwidth Converter

Convert fullwidth/halfwidth characters NEW 📖

Pinyin Converter

Convert Chinese characters to Pinyin NEW

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Base Converter

Convert binary/octal/hex numbers HOT 💯

Number Formatter

Add thousands separators & decimals 📊

Percentage Calculator

Calculate percentage increase/decrease ⚖

BMI Calculator

Calculate BMI from height & weight 🎲

Random Number Generator

Generate random numbers in range ⚡

Bitwise Calculator

AND/OR/XOR/NOT bitwise operations 📐

Ratio Calculator

Calculate proportional scaling 🔢

Prime Number Checker

Check if a number is prime 🌀

Fibonacci Sequence

Generate Fibonacci sequence 🔢

Factorial Calculator

Calculate large integer factorials 💰

Loan Calculator

Calculate monthly payments & interest 💵

Tip Calculator

Calculate tip amount and split 🔢

Scientific Notation Converter

Convert scientific notation 📐

Matrix Calculator

Matrix operations and determinants 🔢

Complex Number Calculator

Complex number arithmetic Ⅻ

Roman Numeral Converter

Convert Arabic/Roman numerals 📐

Angle Converter

Convert degrees, radians, gradians 🏷

Discount Calculator

Calculate discount price & savings HOT ⚡

Electricity Bill Calculator

Calculate electricity bill by usage 📊

Percentage Change Calculator

Calculate percent change between values ➗

Ratio Simplifier

Simplify ratios to lowest terms 📊

Weighted Average Calculator

Calculate weighted average value 👥

Split Bill Calculator

Split bill with tip among people 🎨

Paint Calculator

Calculate paint needed for walls 🏗

Concrete Calculator

Calculate concrete volume needed ⛽

Fuel Cost Calculator

Calculate trip fuel cost HOT 🎂

Exact Age Calculator

Calculate exact age in days/hours

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Timestamp Converter

Convert Unix timestamp to date/time HOT 📅

Date Difference

Calculate days between two dates ⏰

Cron Expression Parser

Parse and generate cron expressions HOT 🎂

Age Calculator

Calculate precise age from birthday 📅

Week Number Finder

Find week number and weekday 🌍

Timezone Converter

Convert times between timezones 📅

ISO Week Calculator

Convert ISO 8601 week format 📅

Date Formatter

Convert between date format strings 📅

Business Days Calculator

Count business days between dates 📆

Calendar Generator

Generate calendar view for any month 🌐

Timezone Reference

Global timezone UTC offset lookup ☀

DST Checker

Check if date is in DST period 🕐

Online Clock

Fullscreen digital & analog clock NEW 📅

Anniversary Calculator

Important date countdown timer NEW

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Color Format Converter

Convert HEX/RGB/HSL/HSV colors HOT 🎨

Color Picker

Visual color picker with code copy 🎨

Color Palette Generator

Generate harmonious color schemes 👁

Color Contrast Checker

Check WCAG color contrast ratio 🌈

Gradient Generator

Visual CSS gradient code generator 🗜

Image Compressor

Compress images to reduce file size 📏

Image Resizer

Resize images while keeping ratio ✂

Image Cropper

Crop images to specified area 🔄

Image Format Converter

Convert PNG/JPG/WebP/AVIF formats 🖼

ICO to PNG Converter

Extract all sizes from ICO files as PNG NEW 🎨

SVG 转 PNG

SVG矢量图转PNG自定义尺寸导出 NEW 📐

图片缩放

批量调整图片尺寸按比例缩放裁剪 NEW 🔍

Image Metadata Viewer

View image EXIF metadata info 📱

QR Code Generator

Generate custom content QR codes HOT 📱

QR Code Reader

Scan and read QR code from image 🖼

Favicon Generator

Generate multi-size favicon icons NEW 🎨

Favicon Converter

Convert images to ICO favicon files NEW 🔍

Favicon Checker

Check website favicon status and format NEW 🎨

SVG Optimizer

Compress and optimize SVG graphics 🖼

Placeholder Image

Generate placeholder images 🎨

Material Design Colors

Google Material Design color palette 🎨

Tailwind Colors Reference

Tailwind CSS color palette lookup 🎨

Image Color Extractor

Extract colors from images 🌈

CSS Gradient Presets

Curated CSS gradient backgrounds 👁

Color Blindness Simulator

Simulate color blindness types ♿

Accessible Color Pairs

Generate WCAG AA/AAA color pairs 🎨

Color Name Finder

Find closest named color from hex 🎨

Color Scheme Generator

Generate mono/complementary schemes 🏢

Brand Color Guide

Famous brand colors and guidelines 🎨

Material Design Colors

Google Material Design color palette 🎨

Tailwind Colors

Tailwind CSS color palette lookup

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IP Address Lookup

Look up IP address geolocation HOT 🔍

DNS Lookup

Query A/AAAA/MX/TXT DNS records 🌐

WHOIS Lookup

Query domain registration info NEW 🔒

DNS Leak Test

Test VPN for DNS request leaks NEW 🔐

DNS加密完全指南

DoH/DoT/DoQ对比及代理DNS加密配置 NEW 🔐

TLS/JA3 Fingerprint

Detect browser TLS/JA3 fingerprint NEW 📡

WebRTC Leak Test

Test WebRTC real IP address leaks NEW 🔍

Browser Fingerprint

Detect browser canvas/WebGL prints NEW 🌐

IP/HTTP Header Leak Test

Test IPv6 and HTTP proxy header leaks NEW 📍

Geolocation Leak Test

Test browser location API leaks NEW 🔎

Domain Recon

Full DNS/mail/CDN/security recon NEW 🏷️

Domain Availability

Bulk check domain availability NEW 📋

HTTP Status Codes

HTTP status code quick reference 📋

HTTP Headers Reference

HTTP request headers reference 🌐

CORS Config Generator

Generate CORS configuration code ⌨

cURL Command Builder

Build cURL commands via form 🔗

URL Parser

Parse URL into components 🔗

URL Builder

Build complete URL from parts 📋

MIME Types Reference

File extension to MIME type lookup 🔌

Port Reference

Common network port reference 🔍

User-Agent Parser

Parse User-Agent string details 🔐

Base64 URL Encoding

URL-safe Base64 encode/decode 🌐

IP Range Calculator

Calculate CIDR subnet IP ranges 🔍

MAC Address Lookup

Look up MAC address vendor info 🔒

SSL Certificate Decoder

Decode SSL certificate details 📡

HTTP Request Builder

Build and test HTTP requests 🔑

OAuth2 Flow Builder

Build OAuth2 authorization URLs 📊

JWT vs Session Guide

Compare JWT vs session auth 📡

WebSocket Echo Test

Test WebSocket connection & echo 🌐

DNS Records Guide

A/AAAA/CNAME/MX/TXT record guide 📡

HTTP Headers Guide

HTTP request/response headers guide 🔌

REST API Best Practices

RESTful API design conventions 🔄

WebSocket Reference

WebSocket protocol handshake guide 🔐

OAuth2 Flow Guide

OAuth2 auth code and PKCE flows ⚡

GraphQL Overview

GraphQL query/mutation/sub overview 🌍

CDN Setup Guide

CDN principles and cache config 📡

TCP vs UDP Guide

TCP vs UDP protocol comparison ⚖

Load Balancer Guide

Round-robin, weighted LB algorithms 🔍

Network Debug Guide

ping/traceroute/nslookup diagnostics 🔌

API Versioning Guide

URL/header API versioning strategies ⏱

Rate Limiting Guide

Token bucket, sliding window algos 🔐

API Auth Guide

API Key/JWT/OAuth2 auth comparison 🔗

Webhook Guide

Webhook config, signing & retries 🌐

CORS Config Guide

Complete CORS config reference 🌍

IP Geolocation

Look up IP geographic location 🌐

HTTP Status Codes

Complete HTTP status code reference ⚡

Speed Test

Test download, upload speed and latency HOT NEW 🗜

Gzip Compression Checker

Check if website uses Gzip compression NEW

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AI Models Comparison

Compare GPT-4, Claude, Gemini, Llama specs & pricing NEW 💰

AI API Pricing

AI API pricing comparison by token NEW 🔢

Token Counter

Estimate GPT/Claude token count for text NEW 📝

Prompt Templates

AI prompt templates and best practices NEW 🧠

ML Algorithms Guide

ML algorithm comparison and selection guide NEW 🧬

Neural Network Architectures

CNN, RNN, Transformer, GAN architecture reference NEW 🔥

PyTorch Cheat Sheet

PyTorch common API and code patterns NEW 📊

TensorFlow Cheat Sheet

TensorFlow/Keras API quick reference NEW 🔍

Regex Generator

Auto-generate common regex patterns 🎨

Color Code Generator

Generate color codes in all formats 📦

Flexbox Generator

Visual Flexbox code generator HOT 📦

CSS Grid Generator

Visual CSS Grid code generator 🌑

CSS Shadow Generator

Visual CSS box-shadow generator ✨

CSS Animation Generator

Visual CSS animation generator 🌈

CSS Gradient Generator

Visual CSS gradient generator ⬜

Border Radius Generator

Visual border-radius generator 🎨

CSS Filter Generator

Visual CSS filter generator 🏷

Meta Tags Generator

Generate SEO meta tags with preview 📄

HTML Template

Generate HTML page boilerplate 🤖

Robots.txt Generator

Generate and validate robots.txt ⚙

.htaccess Generator

Generate Apache .htaccess config ⚙

Nginx Config Generator

Generate Nginx server config 🐳

Docker Compose Generator

Generate Docker Compose config 🐳

Dockerfile Generator

Generate Dockerfile templates NEW 🚫

.gitignore Generator

Generate project .gitignore files HOT ⚡

GitHub Actions Generator

Generate CI/CD workflow config 📋

JSON Schema Generator

Generate and validate JSON Schema 📚

OpenAPI Template

Generate OpenAPI 3.0 spec template 📡

API Response Format

Generate standard JSON API response 🎨

CSS Variables Generator

Generate CSS custom property tokens ⚡

Tailwind Config Generator

Generate tailwind.config.js 🔍

ESLint Config Generator

Generate .eslintrc config template ✨

Prettier Config Generator

Generate .prettierrc config template 📘

tsconfig Generator

Generate TypeScript tsconfig.json 📦

Webpack Config Generator

Generate webpack.config.js template ⚡

Vite Config Generator

Generate vite.config.ts template 🔄

Babel Config Generator

Generate babel.config.js template 📋

Makefile Template

Generate project Makefile template 📦

package.json Template

Generate Node.js package.json ▶

Code Runner

Run HTML/CSS/JS code online HOT NEW 📊

Sorting Visualizer

Animated sorting algorithm comparison HOT NEW 🗺

Pathfinding Visualizer

A*/Dijkstra/BFS maze pathfinding NEW 🌳

Data Structure Viewer

Linked list, tree, graph animations NEW

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JSON to TypeScript

Generate TypeScript types from JSON HOT 🐹

JSON to Go Struct

Generate Go structs from JSON HOT ☕

JSON to Java Class

Generate Java POJO classes from JSON 🐍

JSON to Python Class

Generate Python dataclasses from JSON 🦀

JSON to Rust Struct

Generate Rust structs from JSON 💜

JSON to C# Class

Generate C# classes from JSON 🗃

SQL to JSON

Format SQL results as JSON 📝

Markdown to HTML

Convert Markdown text to HTML 📄

HTML to Markdown

Convert HTML code to Markdown 🔄

TOML to JSON

Convert TOML config to JSON 🔄

INI to JSON

Convert INI config to JSON 📏

Length Converter

Convert meters, inches, feet, etc. ⚖

Weight Converter

Convert kg, pounds, ounces, etc. 🌡

Temperature Converter

Convert Celsius, Fahrenheit, Kelvin 📐

Area Converter

Convert sq meters, acres, hectares 💾

Data Size Converter

Convert Byte, KB, MB, GB, TB 🏃

Speed Converter

Convert km/h, m/s, mph, etc. 🎲

Mock Data Generator

Generate various test mock data HOT 👤

Random User Generator

Generate random user profiles 🪪

ID Card Validator

Validate Chinese ID card numbers 📱

Phone Number Validator

Validate phone number format 📧

Email Validator

Validate email address format 💳

Credit Card Validator

Luhn algorithm card validation 📊

Excel Formula Converter

Convert Excel formulas to SQL 🔍

JSON Diff

Visual diff of two JSON structures 🔍

YAML Diff

Visual diff of two YAML files 🔄

.env to JSON

Convert .env variables to JSON 📋

JSON Flattener

Flatten nested JSON to key-value 🗃

CSV to SQL

Generate SQL INSERT from CSV data 🗃

JSON to SQL

Generate SQL INSERT from JSON data 📊

SQL to CSV

Convert SQL results to CSV format 📘

GraphQL to TypeScript

Generate TS types from GraphQL 📘

OpenAPI to Types

Generate TS types from OpenAPI spec 📊

Data Format Comparison

Compare JSON/XML/CSV/YAML/Parquet ✅

JSON Schema Validator

Validate JSON against JSON Schema ✅

CSV Validator

Check CSV encoding and data errors 📊

CSV Viewer

Preview CSV/TSV with sort and search NEW 📄

XML Schema Guide

XSD XML validation reference 📦

Avro Schema Guide

Apache Avro schema definition guide

📏

px / rem Converter

Convert between px and rem/em units HOT 📐

CSS Units Converter

Convert px/em/rem/vh/vw CSS units 📱

Viewport Units Reference

vw/vh/vmin/vmax conversion reference 📚

Z-index Manager

Manage and plan CSS z-index layers 🔤

Font Scale Generator

Generate harmonious font size scale 📐

Spacing System Generator

Generate base-multiplied spacing 📱

Responsive Breakpoints

Framework responsive breakpoint ref 🔣

Unicode Icons Finder

Search and copy Unicode icon chars 😀

Emoji Finder

Search, find and copy emojis HOT ✨

Special Characters

Common special characters reference 🎨

ASCII Art Generator

Convert text to ASCII art fonts 📈

Cubic Bezier Editor

Visual CSS cubic-bezier editor 📱

Media Query Generator

Generate CSS media query snippets 🎨

Tailwind Colors

Tailwind CSS color palette lookup 📏

REM Baseline Calculator

Calculate REM baseline font size 📦

Container Query Builder

Generate CSS Container Query code 📜

Scroll Snap Reference

CSS Scroll Snap property reference 📋

CSS Logical Properties

CSS logical vs physical properties ✨

Animation Duration Guide

UI animation timing best practices ⚡

will-change Reference

CSS will-change usage guide 🔢

CSS Counter Guide

CSS counter property usage guide 🖨

Print Stylesheet Guide

CSS print media best practices 📱

PWA Development Guide

Service Worker & Manifest guide ♿

Web Accessibility Guide

WCAG 2.1 accessibility reference 🎨

CSS Variables Guide

CSS custom property theming guide 📐

CSS Container Queries

Container Queries syntax & usage ⚡

Web Performance Guide

Code splitting & lazy loading tips 💾

Browser Storage Guide

localStorage/IndexedDB comparison 🎨

Canvas API Guide

HTML5 Canvas drawing API reference ✨

Web Animations Guide

CSS/WAAPI animation perf guide 📄

HTML5 Semantic Tags

Semantic HTML element usage guide 📐

CSS Grid Advanced Layout

Masonry and complex Grid layouts 🔧

Micro Frontend Guide

Module Federation micro frontend 📚

Storybook Guide

Component docs and visual testing 🌙

Dark Mode Guide

CSS prefers-color-scheme dark mode 📝

CSS Naming Convention

BEM/SMACSS/OOCSS naming comparison 🖼

Image Lazy Loading Guide

IntersectionObserver lazy loading 🔤

Font Loading Optimization

font-display and subsetting tips 📐

CSS Logical Properties

CSS logical properties for i18n 🎨

Tailwind Cheatsheet

Tailwind CSS class name lookup 📐

Flexbox Playground

Interactive Flexbox layout editor 🔲

CSS Grid Generator

Visual CSS Grid layout generator

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SSL Certificate Checker

Check SSL certificate status & expiry 🧮

Password Entropy Calculator

Calculate password entropy & strength 🛡

XSS Reference

XSS payloads and defense reference 🗃

SQL Injection Reference

SQL injection testing & defense guide 🛡

CSP Policy Generator

Generate Content Security Policy 🔑

OAuth 2.0 Builder

Build OAuth 2.0 auth request params 🔍

Sensitive Info Detector

Detect secrets & passwords in text NEW 🔒

Hash Algorithm Reference

Hash algorithm security reference 🔐

SSL/TLS Reference

SSL/TLS versions & cipher suites ref 🎫

JWT Best Practices

JWT security guide & common errors 🌐

CORS Security Guide

CORS cross-origin security practices ⚡

Rate Limiting Patterns

Token bucket, sliding window algos 🔍

Dependency Audit Reference

npm/pip/go dependency audit commands 🔑

Secret Scanning Patterns

API key format regex patterns 🛡

OWASP Top 10 Reference

OWASP Top 10 vulnerability guide 🛡

OWASP Top 10 Guide

2021 OWASP Top 10 risks explained 🔐

Secure Coding Guide

Input validation & parameterized queries 🔓

Pentest Basics

Authorized penetration testing guide 🔑

Cryptography Basics

Symmetric/asymmetric crypto & hashing 🏰

Zero Trust Guide

Zero trust security architecture 🚨

Incident Response Guide

Security incident response playbook 🔍

Vulnerability Management

CVE/CVSS scoring & patch workflow 🎯

Threat Modeling Guide

STRIDE threat analysis methodology ☁

Cloud Security Guide

IAM & network cloud security tips 🔗

Supply Chain Security

SBOM & dependency risk mitigation 🔏

GDPR Compliance Checklist

EU data protection compliance guide 📋

Privacy Policy Guide

Privacy policy required clauses 🔒

SSL/TLS Config Guide

TLS 1.3 certificate security config 🛡

HTTP Security Headers

CSP/HSTS/X-Frame security headers 🔍

Dependency Audit Guide

npm audit/Snyk vuln scanning

📚

Git Commands Cheatsheet

Git common commands cheatsheet HOT 🏷

Semantic Versioning Parser

Parse and compare SemVer versions 🐳

Docker Commands Cheatsheet

Docker common commands cheatsheet 🐧

Linux Commands Cheatsheet

Linux common commands cheatsheet HOT 🔴

Redis Commands Cheatsheet

Redis common commands cheatsheet 🗃

MySQL Commands Cheatsheet

MySQL common commands cheatsheet ☸

Kubernetes Cheatsheet

kubectl common commands cheatsheet 📜

Shell Script Template

Generate shell script boilerplate ⚙

.env Template Generator

Generate project .env template 📋

Changelog Template

Generate standard CHANGELOG template 📄

README Template

Generate project README template ⚖

License Generator

Generate open source license files 📚

Regex Pattern Library

Curated regex pattern collection 📋

ASCII Table

ASCII character code lookup table 📦

Protobuf Reference

Protocol Buffers syntax reference 📋

Makefile Reference

Makefile syntax and tips reference ⚡

CI/CD Patterns

Common CI/CD pipeline patterns 🚀

Blue-Green Deployment

Blue-green & canary deploy guide 🚩

Feature Flags Guide

Feature flag design best practices 📊

Observability Guide

Metrics/Logs/Traces pillar guide ⚙

Nginx Config Guide

Reverse proxy, SSL, vhost config ☸

K8s YAML Reference

Deployment/Service/ConfigMap YAML 🌍

Terraform Basics

HCL syntax, resource & provider config 📊

Prometheus Monitoring

PromQL query syntax & alert rules ⎈

Helm Charts Guide

Helm package & chart template guide 🔄

CI/CD Patterns

Common CI/CD pipeline patterns 📋

Log Aggregation Guide

ELK Stack & Loki log collection 🕸

Service Mesh Guide

Istio & Linkerd core concepts 📦

GitOps Guide

ArgoCD & Flux GitOps workflows ☁

Cloud Native Guide

Microservices & serverless patterns 🛡

Container Security Guide

Docker & K8s container security 👁

Observability Guide

Metrics/Logs/Traces pillar guide 🔧

SRE Practice Guide

SLO/SLA & error budget practices 🏗

Infrastructure as Code

IaC best practices & tool guide 🚀

Blue-Green/Canary Deploy

Blue-green vs canary deploy guide ⏰

Cron Expression Builder

Visual cron expression builder 🐳

Docker Best Practices

Image optimization & multi-stage builds ☸

K8s Troubleshooting

Pod CrashLoopBackOff diagnostics 📦

Git Advanced Guide

rebase/cherry-pick/stash techniques 🔒

SSH Tunneling Guide

Local/remote/dynamic port forwarding ⏲

Cron Expression

Build and validate cron expressions 🗂

Git Commands Cheatsheet

Git common commands cheatsheet

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Meta Tags Preview

Preview page in search engine results HOT 📱

Open Graph Preview

Preview Open Graph social share card 🐦

Twitter Card Preview

Preview Twitter share card design 🔖

Schema.org Generator

Generate JSON-LD structured data 🗺

Sitemap Validator

Validate sitemap.xml format 📊

Keyword Density Analyzer

Analyze page keyword density 📖

Readability Analyzer

Analyze text readability difficulty 🌍

Hreflang Generator

Generate multi-language hreflang tags 📊

Core Web Vitals Guide

LCP/FID/CLS optimization guide 🔦

Lighthouse Metrics

Lighthouse score meaning & tips 🔖

Structured Data Types

Schema.org data types reference 🔗

Canonical Tag Guide

Canonical tag best practices 📄

Pagination SEO Guide

Pagination SEO best practices 🌍

International SEO Guide

Multi-language multi-region SEO ⚡

AMP Basics

Accelerated Mobile Pages intro 📊

Core Web Vitals Guide

LCP/FID/CLS optimization guide 🏗

Structured Data Guide

JSON-LD Schema.org markup guide ✅

Technical SEO Checklist

Technical SEO audit checklist 🔗

Link Building Guide

Quality backlink building strategies 📍

Local SEO Guide

Google My Business local SEO tips ⚡

Page Speed Guide

Page load speed optimization guide 🛒

E-Commerce SEO Guide

Product page SEO optimization tips 📝

Content SEO Guide

Keyword layout & content structure 🌍

International SEO Guide

Multi-language multi-region SEO 🔍

SEO Audit Guide

Complete site SEO health audit 🔍

Keyword Research Guide

Search intent & keyword analysis 📝

Title Tag Optimization

SEO title tag writing & length tips 🖼

Image SEO Guide

Alt text, naming & format optimization 📱

Mobile SEO Guide

Mobile-first indexing optimization 🎤

Voice Search Optimization

FAQ content & Featured Snippet tips

🐍

Python Formatter

Format Python code to PEP8 style 🐍

PEP8 Checker

Check Python PEP8 compliance 🐍

venv Setup Guide

Python virtual env setup guide 🐍

pip Commands Reference

Python pip commands cheatsheet 🐍

Type Hints Guide

Python type annotation reference 🐍

List Comprehension

List/set/dict comprehension examples 🐍

Decorators Reference

Python decorator patterns & examples 🐍

Generators Reference

Python generator & yield guide 🐍

asyncio Reference

Python async programming reference 🐍

dataclass Reference

Python dataclasses module guide ⚡

ES6+ Cheatsheet

ES6/ES2017+ syntax cheatsheet ⚡

Promise Patterns

Promise & async/await patterns ⚡

Array Methods Reference

JavaScript Array methods reference HOT ⚡

Object Methods Reference

JavaScript Object methods reference ⚡

Closure Patterns

JavaScript closure use patterns ⚡

Prototype Chain Guide

Prototype chain & inheritance guide ⚡

Event Loop Reference

Event loop mechanism illustrated ⚡

Module Patterns

CommonJS/ESM/UMD module comparison ⚡

JS Regex Reference

JavaScript RegExp full reference ⚡

Web APIs Reference

Browser Web API quick reference 📘

Utility Types Reference

TypeScript built-in utility types 📘

tsconfig Generator

Interactive tsconfig.json generator 📘

Interface Builder

Visual TypeScript interface builder 📘

Generics Guide

TypeScript generics syntax guide 📘

TS Decorators

TypeScript decorator syntax & examples 📘

Strict Mode Guide

TypeScript strict mode config guide 📘

Type Guards Reference

Type guard patterns reference 📘

Conditional Types

Conditional type syntax reference 🐹

Go Commands Reference

go build/test/mod commands guide 🐹

Go Modules Guide

Go module management & go.mod 🐹

Concurrency Patterns

Goroutine & Channel patterns 🐹

Interface Patterns

Go interface design patterns 🐹

Error Handling Guide

Go error handling best practices 🐹

Goroutine Guide

Goroutine lifecycle & management 🐹

Channel Patterns

Go channel usage patterns 🐹

Go Testing Guide

Go testing package cheatsheet 🦀

Cargo Commands

Rust Cargo commands cheatsheet 🦀

Ownership Guide

Ownership & borrowing rules guide 🦀

Lifetime Reference

Lifetime annotation syntax guide 🦀

Trait Patterns

Trait design & common patterns 🦀

Rust Error Handling

Result/Option error patterns 🦀

Async Patterns

async/await & tokio reference 🦀

Macros Guide

Declarative & proc macro guide ☕

Maven Commands

Maven build tool commands guide ☕

Gradle Commands

Gradle build tool commands guide ☕

Stream API Reference

Java Stream API method reference ☕

Optional Guide

Java Optional best practices ☕

Concurrency Reference

Java concurrency & thread pools ☕

JVM Reference

JVM params & memory model guide ☕

Annotations Guide

Java annotations usage reference 🐘

Composer Commands

PHP Composer commands cheatsheet 🐘

Artisan Reference

Laravel Artisan commands reference 🐘

Laravel Helpers

Laravel global helper functions 🐘

PSR Standards

PHP PSR standards comparison 🐘

PHP Security Guide

PHP security vulnerabilities guide 💎

Gem Commands

Ruby Gem commands cheatsheet 💎

Rails Commands

Rails CLI commands cheatsheet 💎

RSpec Reference

RSpec testing framework reference 💎

Bundler Guide

Ruby Bundler usage reference 💎

Metaprogramming Reference

Ruby metaprogramming techniques 🍎

SPM Commands

Swift Package Manager commands 🍎

Optional Patterns

Swift Optional usage patterns 🍎

Closures Guide

Swift closure syntax & capture 🍎

Combine Reference

Swift Combine framework reference 🍎

Swift Concurrency

Swift async/await concurrency 🎯

Coroutines Guide

Kotlin Coroutines usage guide 🎯

Collections Reference

Kotlin collection operations 🎯

Extension Functions

Extension functions & properties 🎯

Sealed Classes

Sealed classes & when expressions 🎯

Null Safety Reference

Null safety operators reference 💜

NuGet Commands

NuGet package manager commands 💜

LINQ Reference

C# LINQ query syntax reference 💜

C# async/await

C# async programming reference 💜

Attributes Guide

C# Attribute usage & custom attrs 💜

Records Reference

C# record type syntax reference 🎯

pub Commands

Dart pub package commands 🎯

Flutter CLI

Flutter CLI tool reference 🎯

Null Safety Guide

Dart null safety migration guide 🎯

Streams Reference

Dart Stream/StreamController guide 🔴

SBT Commands

Scala SBT build tool commands 🔴

Collections API

Scala collection operations 🔴

Pattern Matching

Scala pattern matching syntax 🔴

Futures Reference

Scala Future async programming 💧

Mix Commands

Elixir Mix build tool commands 💧

Phoenix Guide

Phoenix framework commands guide 💧

Processes Reference

Elixir process & GenServer guide 💧

Ecto Reference

Elixir Ecto database queries 🔵

Lein Commands

Clojure Leiningen commands 🔵

REPL Guide

Clojure REPL tips & tricks 🔷

Cabal Commands

Haskell Cabal commands guide 🔷

Type System Guide

Haskell type system & typeclasses 📊

R Packages Reference

R package install & usage guide 📊

dplyr Reference

R dplyr data operations reference 🔵

Pkg Commands

Julia Pkg manager commands 🔵

Plotting Reference

Julia Plots.jl plotting guide 🐪

CPAN Commands

Perl CPAN module management 🐪

Advanced Regex

Perl advanced regex reference 🌙

Lua Reference

Lua 5.4 syntax & stdlib guide 🌙

Coroutines Reference

Lua coroutine usage reference 📜

Bash Scripting Guide

Bash scripting syntax & tips 📜

Bash Regex

Bash regex matching reference 📜

Process Substitution

Bash process substitution guide 📜

Bash Arrays Reference

Bash array operations reference 🐘

PHP Composer Guide

Composer package manager guide 💎

Bundler Guide

Ruby Bundler usage reference 🍎

Swift Package Guide

Swift Package Manager guide 🎯

Dart Quick Reference

Dart core syntax & async guide ⚡

Scala Quick Reference

Scala FP & OOP features guide 💧

Elixir Quick Reference

Elixir concurrency & pipe guide λ

Haskell Quick Reference

Haskell types & function guide 🌙

Lua Basics Guide

Lua core syntax quick reference ⚡

C Language Reference

C pointers & memory management ⚡

C++ STL Reference

C++ STL containers & algorithms 💻

Assembly Basics

x86/x64 assembly instruction set 🔍

Regex Flavors Guide

PCRE/Python/JS regex differences 🐚

Shell Scripting Guide

Bash/Zsh scripting tips reference 🔧

AWK & SED Reference

Text processing AWK & SED guide 🔧

Makefile Guide

GNU Make rules & variables guide

⚛

React Hooks Reference

useState/useEffect hooks reference HOT ⚛

Context Patterns

React Context API usage patterns ⚛

Performance Tips

React performance optimization tips ⚛

Testing Library Reference

React Testing Library reference ⚛

React Query Guide

TanStack Query data fetching guide ⚛

Redux Toolkit

RTK state management cheatsheet ⚛

React Router v6

React Router v6 routing guide 💚

Composition API

Vue 3 Composition API reference 💚

Vue Router v4

Vue Router 4 routing config guide 💚

Pinia Guide

Vue 3 Pinia state management 💚

Vite + Vue Setup

Vite + Vue 3 project setup guide 💚

Vue Testing

Vue Test Utils testing reference 🔺

Angular CLI

Angular CLI commands cheatsheet 🔺

Angular Signals

Angular 17+ Signals API reference NEW 🔺

Angular Forms Guide

Reactive & template forms guide 🔺

RxJS Patterns

RxJS operators in Angular guide 🔺

Angular Testing

Angular TestBed testing reference ▲

Next.js Routing

Next.js App Router routing guide ▲

Next.js Data Fetching

Server Components data fetching ▲

Next.js API Routes

Next.js API route config guide ▲

Next.js Middleware

Next.js Middleware usage guide ▲

Next.js Optimization

Image/Font/Script optimization 💚

Nuxt Modules

Nuxt 3 module system reference 💚

Nuxt Composables

Nuxt built-in composables guide 💚

Nuxt Routing

Nuxt 3 file-based routing guide 🔶

Svelte Stores Guide

Svelte Store reactive state guide 🔶

Svelte Transitions

Svelte transition animation API 🔶

SvelteKit Reference

SvelteKit routing & data loading 🚂

Express Middleware

Express middleware writing guide 🚂

Express Routing Patterns

Express route organization guide 🚂

Express Error Handling

Express error middleware guide 🚂

Express Security

Express Helmet security config ⚡

FastAPI Dependencies

FastAPI dependency injection guide ⚡

FastAPI Models

FastAPI Pydantic models reference ⚡

FastAPI Auth

FastAPI OAuth2/JWT auth reference 🎸

Django ORM Reference

Django ORM query cheatsheet 🎸

Django Admin Guide

Django Admin customization guide 🎸

DRF Reference

Django REST Framework reference 🎸

Django Signals

Django signal mechanism reference 🍃

Spring Annotations

Spring Boot annotations reference 🍃

Spring Data JPA

Spring Data JPA methods reference 🍃

Spring Security

Spring Security config reference 🍃

Spring Actuator

Spring Boot Actuator endpoints 🔴

Eloquent ORM Guide

Laravel Eloquent ORM reference 🔴

Blade Templates

Laravel Blade template syntax 🔴

Laravel Middleware

Laravel middleware registration 🔴

Laravel Queues

Laravel job queue config & usage 💎

ActiveRecord Reference

Rails ActiveRecord query reference 💎

Rails Routing Guide

Rails routing DSL cheatsheet 💎

Rails Turbo Guide

Rails Turbo/Hotwire reference 🐱

NestJS Modules

NestJS module system reference 🐱

NestJS Guards

NestJS guards & interceptors 🐱

NestJS Decorators

NestJS custom decorators guide 📡

tRPC Router

tRPC router & type inference 📡

tRPC Client

tRPC React Query client guide 🐹

Gin Routing

Go Gin routing & groups guide 🐹

Gin Middleware

Go Gin middleware writing guide 🐹

Echo Framework Reference

Go Echo framework cheatsheet 🐹

Fiber Framework Reference

Go Fiber framework cheatsheet 🔥

Hono Framework Reference

Hono edge web framework guide NEW 🚀

Astro Components

Astro component syntax reference 🚀

Astro Routing

Astro file & dynamic routing ⚡

Qwik Framework Guide

Qwik resumability & lazy loading 💿

Remix Framework Guide

Remix loaders & form actions 🚀

Astro Framework Guide

Astro islands & content collections 🔥

HTMX Guide

HTMX attributes & hypermedia 🏔

Alpine.js Guide

Alpine.js lightweight reactivity ⚡

Stencil.js Guide

Stencil Web Components guide 🔥

Lit Framework Guide

Lit Web Components guide 🐍

Flask Guide

Flask routing, context & blueprints ⚡

Go Fiber Guide

Go Fiber high-perf framework 🔥

Hono Guide

Lightweight multi-runtime framework 🦀

Actix Web Guide

Rust Actix Web framework guide 🦀

Axum Framework Guide

Rust Axum web framework guide 🎯

Ktor Framework Guide

Kotlin Ktor server-side guide 🍃

Spring WebFlux Guide

Spring reactive & R2DBC guide 🔌

gRPC Guide

Protobuf & gRPC service definition ⚡

GraphQL Server Guide

Apollo Server / GraphQL Yoga 💾

Prisma ORM Guide

Prisma Schema & DB migration 💾

Drizzle ORM Guide

Drizzle type-safe SQL queries 🗄

Turso Database Guide

LibSQL edge database guide ⚡

Supabase Guide

Supabase DB, auth & realtime ⚡

TanStack Query Guide

Async state & data fetching 🐻

Zustand State Management

Lightweight React state manager ⚛

Jotai Atomic State

Atomic React state management ⚡

Vite Config Guide

Vite build tool config & plugins 📦

Webpack Config Guide

Webpack module bundler config

🗄

MySQL Query Builder

MySQL SELECT/JOIN/GROUP BY guide 🗄

MySQL Index Guide

MySQL index types & optimization 🗄

Transaction Guide

MySQL transaction isolation levels 🗄

Stored Procedures

MySQL stored procedure syntax 🗄

MySQL Optimization

MySQL query & config optimization 🐘

Window Functions

PostgreSQL window functions guide 🐘

JSONB Guide

PostgreSQL JSONB operations guide 🐘

Full-Text Search

PostgreSQL full-text search guide 🐘

Extensions Reference

PostgreSQL common extensions 🐘

Table Partitioning

PostgreSQL table partitioning 🍃

Aggregation Pipeline

MongoDB aggregation operators 🍃

Index Strategies

MongoDB index types & selection 🍃

Schema Patterns

MongoDB schema design patterns 🍃

MongoDB Transactions

MongoDB multi-doc transactions 🔴

Data Structures Reference

Redis five data structure commands 🔴

Pub/Sub Guide

Redis publish/subscribe patterns 🔴

Redis Lua Scripts

Redis Lua scripting guide 🔴

Sentinel Guide

Redis Sentinel HA config guide 📄

SQLite Commands

SQLite CLI commands cheatsheet 📄

SQLite JSON Support

SQLite JSON functions reference 🔍

Query DSL Reference

ES Query DSL search reference 🔍

Aggregation Reference

ES aggregation query reference 📈

Flux Query Reference

InfluxDB Flux query reference 📈

Line Protocol Reference

InfluxDB Line Protocol format 👁

CQL Reference

Cassandra CQL query reference 👁

Data Modeling Guide

Cassandra data modeling guide 🔗

Cypher Guide

Neo4j Cypher query language guide 🔗

Graph Patterns

Neo4j graph database patterns 💎

Prisma Schema Guide

Prisma schema.prisma syntax guide 💎

Prisma Migrations

Prisma DB migration commands 📘

TypeORM Entities

TypeORM Entity decorators guide 📘

TypeORM Migrations

TypeORM migration commands & API 🟢

Sequelize Models

Sequelize model definition guide 🟢

Sequelize Associations

Sequelize model associations 🟡

Drizzle ORM Reference

Drizzle ORM schema & query guide NEW 🗄

MySQL Performance Guide

MySQL slow query & index tuning 🐬

MySQL完全指南

51个深度专题从入门到架构师级别 HOT NEW 🐘

PostgreSQL Advanced

Window functions, JSONB, FTS 🍃

MongoDB Aggregation Guide

Aggregation pipeline optimization 🔴

Redis Patterns Guide

Cache, session, queue patterns 🔍

Elasticsearch Query Guide

Search, filter & aggregation guide 📐

Database Design Guide

Normalization & ER diagram guide 🗃

SQL Window Functions

OVER/PARTITION BY/RANK functions 📑

Database Indexing Guide

B-tree, hash, composite index tips 📊

NoSQL Comparison

MongoDB/Redis/Cassandra comparison 🔄

DB Migration Guide

Migration strategy & rollback guide 🗄

SQLite Guide

SQLite lightweight DB operations 🗄

Cassandra Guide

Cassandra data model & CQL guide 🕸

Neo4j Guide

Neo4j Cypher query language guide 📊

ClickHouse Guide

ClickHouse columnar storage guide 💾

Database Backup Guide

MySQL/PostgreSQL backup & restore

☁

AWS CLI Reference

AWS CLI common commands reference ☁

IAM Policies Reference

AWS IAM Policy syntax reference ☁

S3 Operations Reference

AWS S3 bucket operations guide ☁

Lambda Patterns

AWS Lambda function patterns ☁

EC2 Reference

AWS EC2 instance management ☁

CloudFormation Basics

CloudFormation template syntax ☁

VPC Guide

AWS VPC network config guide ☁

RDS Guide

AWS RDS database instance guide 🔵

GCP CLI Reference

gcloud CLI tool cheatsheet 🔵

GCP IAM Guide

Google Cloud IAM permissions 🔵

Cloud Run Reference

Google Cloud Run deploy guide 🔵

BigQuery Reference

Google BigQuery SQL reference 🔵

Pub/Sub Guide

Google Cloud Pub/Sub guide 🔷

Azure CLI Reference

Azure CLI common commands 🔷

ARM Templates

Azure Resource Manager templates 🔷

Azure Functions Guide

Azure Functions dev guide 🔷

DevOps Pipelines

Azure DevOps Pipeline YAML 🐳

Docker Registry Guide

Docker image registry operations 🐳

Docker Networking

Docker network mode config guide 🐳

Docker Volumes Guide

Docker data volume mount guide 🐳

Docker Security Tips

Docker container security tips ☸

K8s Manifest Templates

K8s common resource YAML templates ☸

Helm Guide

Kubernetes Helm Chart guide ☸

RBAC Guide

Kubernetes RBAC permission guide ☸

Network Policies

K8s NetworkPolicy config guide ☸

Resource Limits

K8s Pod resource limits config 🏗

Terraform Providers

Terraform common providers 🏗

Terraform Modules

Terraform module writing guide 🏗

Terraform State

Terraform remote state management ⚡

Actions Workflows

GitHub Actions workflow YAML guide 🦊

GitLab CI Reference

GitLab CI/CD .gitlab-ci.yml guide 📋

Ansible Playbook Guide

Ansible Playbook syntax reference 🏗

Pulumi Reference

Pulumi IaC cheatsheet ☁

GCP Services Guide

Google Cloud services overview ☁

Azure Services Guide

Microsoft Azure services guide 🌤

Cloudflare Config Guide

DNS/CDN/Workers security config ⚡

Serverless Guide

Lambda/Cloud Functions patterns 🔧

Microservices Patterns

Service discovery, circuit breaker 💰

Cloud Cost Optimization

Reserved/Spot instance optimization 🌐

Multi-Cloud Guide

Multi-cloud deploy & management 🗄

Cloud Storage Guide

S3/GCS/Azure Blob usage guide 📦

Container Registry Guide

ECR/GCR/Docker Hub usage guide 🌐

Cloud Networking Guide

VPC/subnet/security group guide 💰

AWS Cost Estimator

AWS service cost estimation 💰

GCP Cost Estimator

Google Cloud cost estimation 🌐

Edge Computing Guide

CDN edge functions & edge DB 🔒

Disaster Recovery Guide

RTO/RPO & disaster recovery plan 🚀

Cloud Migration Guide

On-prem to cloud migration guide

🃏

Jest Config Guide

Jest testing framework config 🃏

Jest Mock Patterns

Jest mock functions & modules 🃏

Snapshot Testing

Jest snapshot testing guide 🧪

pytest Fixtures Guide

pytest fixture usage reference 🧪

pytest Parametrize

pytest parametrize reference 🧪

pytest Coverage

pytest-cov coverage reference ☕

JUnit5 Annotations

JUnit 5 test annotations guide ☕

JUnit5 Assertions

JUnit 5 assertion methods guide ☕

JUnit5 Parameterized

JUnit 5 parameterized tests 🐹

Go Testing Reference

Go testing package cheatsheet 🐹

Go Benchmark Guide

Go benchmark performance testing 🐹

Table-Driven Tests

Go table-driven test patterns ☕

Mocha Setup Guide

Mocha test framework config guide 🍵

Chai Assertions

Chai assertion library reference 🎭

Sinon Mocks

Sinon.js stub/spy/mock reference 🎭

Playwright Scripts

Playwright end-to-end test guide 🎭

Playwright API Testing

Playwright API testing reference 🌲

Cypress Commands

Cypress test commands cheatsheet 🌲

Cypress Fixtures

Cypress test fixtures usage 🔬

Selenium Guide

Selenium WebDriver cheatsheet 📮

Postman Scripts

Postman pre/post scripts guide 📮

Newman Commands

Newman CLI collection runner 🔥

k6 Load Testing

k6 performance load test scripts 🦗

Locust Setup Guide

Locust distributed load testing ⚡

Apache ab Benchmark

Apache ab benchmark commands ⚡

wrk Benchmark

wrk HTTP benchmark tool guide 🎭

MSW Handlers Guide

MSW request interception guide 🎭

Nock Interceptors

Nock HTTP interception reference 🧪

Unit Testing Guide

AAA pattern & test doubles guide 🔄

TDD Guide

Red-green-refactor TDD cycle 🔌

API Testing Guide

Postman/Newman API testing guide ⚡

Performance Testing Guide

JMeter/k6 stress testing guide 🎭

E2E Testing Guide

Cypress/Playwright framework guide 📊

Test Coverage Guide

Coverage tools & target setting 🎭

Mock & Stub Guide

Test double types & usage guide 🛡

Security Testing Guide

OWASP security testing basics 📱

Mobile Testing Guide

iOS & Android app testing guide 👁

Visual Regression Testing

Percy/Chromatic visual testing

📈

线性回归详解

线性回归原理公式代码实现完全指南 NEW 🌳

决策树算法详解

决策树ID3/C4.5/CART原理与实现 NEW 🌲

随机森林详解

随机森林集成学习原理与调参指南 NEW 📐

SVM 支持向量机详解

SVM核函数超平面分类原理与实现 NEW 📍

KNN 算法详解

K近邻算法原理距离度量与实现 NEW ⬇

梯度下降详解

梯度下降SGD/Adam优化器原理 NEW 🎯

K-Means 聚类详解

K-Means原理肘部法则轮廓系数 NEW 🚀

XGBoost 详解

XGBoost梯度提升原理调参与实战 NEW ∑

Mean, Median & Mode

Compute mean, median & mode ∑

Standard Deviation

Calculate population & sample SD ∑

Variance Calculator

Calculate population & sample var ∑

Correlation Coefficient

Pearson/Spearman correlation 📈

Regression Analysis

Linear regression & prediction 🎲

Probability Calculator

Independent/conditional probability ∑

Bayes' Theorem

Bayesian posterior probability 🎲

Permutations & Combinations

Calculate C(n,r) and P(n,r) 📐

Matrix Addition

Matrix addition & subtraction 📐

Matrix Multiplication

Matrix multiplication operation 📐

Matrix Determinant

Compute square matrix determinant 📐

Matrix Inverse

Compute invertible matrix inverse ∫

Derivative Rules

Derivative & chain rule reference ∫

Integral Rules

Indefinite & definite integral rules ∞

Limits Reference

Limit formulas & L'Hopital's rule 🔢

Prime Factorization

Factor integers into primes 🔢

GCD & LCM Calculator

Calculate GCD and LCM 🔢

Modular Arithmetic

Modular operations & modular inverse 🔢

Number Sequences

Arithmetic/geometric/Fibonacci gen 📐

Area Formulas Reference

Common geometry area formulas 📐

Volume Formulas Reference

Common solid volume formulas 📐

Trigonometry Reference

Trig function table & formulas 📐

Coordinate Geometry

Line, circle & distance formulas 🌊

Fourier Transform

Fourier transform formulas 🌊

Laplace Transform

Common Laplace transform pairs 📐

Quadratic Equation Solver

求解ax²+bx+c=0的实数根和复数根 📊

Statistics Calculator

Mean/median/SD all-in-one calc 📉

Z-Score Calculator

Z-score & normal distribution 🔢

Permutation & Combination

Calculate P(n,r) and C(n,r) 📐

Vector Calculator

2D/3D vector dot & cross product 📐

Trigonometry Calculator

Sin/cos/tan & inverse trig calc 🔢

Logarithm Calculator

Natural, common & custom base log 📐

Polynomial Operations

Polynomial add/multiply/factor ⭕

Unit Circle Reference

Trig function unit circle lookup ∫

Calculus Formulas

Derivative & integral formulas 📊

Linear Algebra Guide

Matrix, determinant & eigenvalue 🔢

Number Bases Guide

Binary/octal/hex conversion theory 🎲

Probability Guide

Classical & conditional probability 📐

Geometry Formulas

Triangle/circle/polygon formulas 📊

Financial Math Guide

PV/FV/IRR calculation principles 🔢

Set Theory Guide

Union/intersection/Venn diagrams 💻

Boolean Algebra Guide

Logic operations & truth tables 🕸

Graph Theory Basics

Directed graphs & path algorithms 🔢

Scientific Calculator

Advanced calculator with sin/cos/log NEW 📐

Quadratic Equation Solver

求解一元二次方程并画图 NEW 📐

Quadratic Equation Solver

求解ax²+bx+c=0并绘制图像 NEW 📊

Poisson Distribution

Poisson probability calculator NEW

💹

Compound Interest Calculator

Calculate compound growth & FV 💰

Simple Interest Calculator

Calculate simple interest & FV 📈

ROI Calculator

Calculate return on investment 💰

NPV Calculator

Calculate net present value 📈

IRR Calculator

Calculate internal rate of return 🏠

Mortgage Calculator

Calculate monthly payment & plan 📋

Loan Amortization

Generate loan amortization table 🏠

Refinancing Calculator

Calculate refinancing savings 🏠

Rent vs Buy Analyzer

Compare renting vs buying costs 📋

Tax Bracket Reference

Income tax bracket reference 💰

VAT Calculator

Calculate VAT inclusive/exclusive 📈

Capital Gains Calculator

Calculate stock capital gains tax 💱

Currency Format Reference

Global currency format & symbols 💱

Exchange Rate Guide

Foreign exchange rate guide 📊

Options Greeks Reference

Delta/Gamma/Theta/Vega reference 📊

Black-Scholes Calculator

Black-Scholes option pricing 📊

Implied Volatility

Calculate option implied volatility 📈

Sharpe Ratio Calculator

Risk-adjusted return calculation 📈

Beta Calculator

Calculate stock beta coefficient 📊

Portfolio Variance

Portfolio variance & std deviation 📋

Balance Sheet Template

Standard balance sheet template 📋

Income Statement Template

Standard income statement template 📋

Cash Flow Template

Standard cash flow statement 📊

Financial Ratios Reference

Liquidity/profitability ratios 🏠

Mortgage Calculator

Calculate monthly payment & plan HOT 🚗

Car Loan Calculator

Calculate car loan monthly payment 💳

Credit Card Payoff

Calculate credit card payoff time 🏦

Savings Goal Calculator

Calculate monthly savings needed 👴

Retirement Planner

Estimate retirement savings needed 📈

Stock Profit Calculator

Calculate stock trading profit 💰

Dividend Yield Calculator

Calculate dividend yield & income 📊

Break-Even Calculator

Calculate break-even point 💹

Inflation Calculator

Calculate inflation impact on value 📋

US Tax Brackets

2024 US federal tax brackets 🇬🇧

UK Income Tax Calculator

UK income tax & NI calculation 🇦🇺

Australia GST Calculator

Australia GST tax calculator 🏦

Pension Calculator

Calculate Chinese pension benefits HOT NEW 💰

Income Tax Calculator

China income tax with deductions HOT NEW

🛒

Amazon FBA Calculator

Calculate Amazon FBA fees & margins HOT 🛒

Shopify Fee Calculator

Calculate Shopify plan fees HOT 🏪

eBay Fee Calculator

Calculate eBay listing & FVF fees HOT 🎨

Etsy Fee Calculator

Calculate Etsy listing & txn fees 💰

Profit Margin Calculator

Calculate gross/net profit margin HOT 🚢

Import Duty Calculator

Estimate import duty & VAT costs HOT 📦

Dropshipping Profit Calc

Calculate dropshipping profit margin 💳

PayPal Fee Calculator

Calculate PayPal transaction fees 💳

Stripe Fee Calculator

Calculate Stripe payment fees 📊

Amazon ACOS Calculator

Calculate Amazon ACOS and TACOS 💱

Currency Converter

Real-time multi-currency converter HOT 🧾

EU VAT Calculator

Calculate EU country VAT rates 🧾

US Sales Tax Calculator

Calculate US state sales tax 📈

E-Commerce ROI Calculator

Calculate ad & marketing ROI 🏷

Product Pricing Tool

Reverse-calculate price from margin 📮

Shipping Weight Calculator

Calculate DHL/FedEx/UPS weight 🔍

Amazon Keyword Guide

Amazon search keyword strategies 🔍

Shopify SEO Guide

Shopify store SEO best practices 📦

Dropshipping Guide

Full dropshipping workflow guide 📧

E-Commerce Email Guide

Cart recovery & welcome email tips ⭐

Amazon Review Strategy

Compliant Amazon review strategies 📷

Product Photography Guide

Product photo shooting & editing 💰

Marketplace Fees Comparison

Platform fee comparison chart ✈

Intl Shipping Guide

DHL/FedEx/UPS comparison guide ↩

Return Rate Calculator

Calculate return cost impact 📱

Influencer Marketing Guide

Influencer collaboration strategies 📊

Customer Lifetime Value

LTV calculation & retention tips 🔄

Subscription Model Guide

SaaS & subscription pricing tips 📈

Upsell & Cross-Sell Guide

Upsell & cross-sell techniques 🛒

Abandoned Cart Guide

Cart recovery email strategies NEW 📦

Shipping Calculator

Estimate courier shipping costs NEW 📊

Barcode Generator

Generate EAN/UPC/Code128 barcodes NEW

🍎

Daily Calorie Calculator

Calculate daily calorie needs HOT 😴

Sleep Cycle Calculator

Find optimal bedtime by wake time HOT 🤱

Due Date Calculator

Calculate due date from LMP HOT 📅

Ovulation Calculator

Calculate ovulation & fertile days ⚖

Ideal Weight Calculator

Calculate ideal weight by formulas 💪

Body Fat Calculator

Estimate body fat percentage 💧

Water Intake Calculator

Calculate daily water needs ❤

Heart Rate Zones

Calculate cardio heart rate zones 🥗

Macro Calculator

Calculate daily protein/fat/carb 🏃

Running Pace Calculator

Convert pace, speed & finish time HOT 👟

Steps to Calories

Convert daily steps to calories 🍺

Alcohol Units Calculator

Calculate alcohol units & metabolism 💊

Blood Pressure Guide

Blood pressure WHO grade reference 🔥

TDEE Calculator

Calculate total daily energy output HOT 🥩

Protein Intake Calculator

Calculate protein needs by weight 👶

Baby Milestone Guide

0-24mo baby development milestones 📏

Height Predictor

Predict child adult height 💉

Vaccination Schedule

Recommended vaccination schedule ☀

Sunscreen SPF Guide

SPF & PA sunscreen index guide ⏰

Intermittent Fasting Calc

16:8 fasting window calculator 📅

Period Cycle Calculator

预测下次月经时间和周期规律 💉

Cholesterol Reference

Total/HDL/LDL cholesterol levels 🩸

Blood Sugar Reference

Fasting/postprandial glucose ref 👁

Vision Prescription Guide

Myopia/astigmatism diopter guide 🏋

Fitness Goal Calculator

Bulk/cut/maintain calorie plan ☀

UV Index Guide

UV index grades & skin protection 🔊

Noise Level Reference

Common noise decibel levels 😴

Sleep Quality Guide

Science-based sleep quality tips 🧘

Stress Management Guide

Stress assessment & relief methods 🥦

Nutrition Guide

Vitamin & mineral daily intake 💺

Posture Guide

Desk posture & eye care guide NEW 👁

Eye Care Guide

20-20-20 rule & eye strain tips NEW ☕

Caffeine Guide

Caffeine content & safe intake 🍽

Meal Planning Guide

Balanced weekly meal planning 🧘

Stretching Guide

Desk worker stretching exercises 💕

Zodiac Compatibility

Check zodiac sign compatibility NEW 👁

Color Vision Test

Screen for color blindness NEW 🔊

Noise Generator

White/pink/brown noise for focus NEW 📜

Today in History

What happened today in history NEW 🌍

World Capitals

World capitals, flags, population NEW 🌸

Period Cycle Calculator

女性生理周期安全期排卵期 NEW 🔌

Electricity Cost Calculator

Estimate appliance electricity cost NEW 📜

Today in History

What happened today in history NEW 🌍

World Capitals

World capitals, flags, population NEW 👁

Color Vision Test

Screen for color blindness NEW

📐

Area Converter

Convert sq meters/acres/hectares HOT 🧪

Volume Converter

Convert liters/gallons/cu feet 🚀

Speed Converter

Convert km/h/mph/m/s/knots HOT ⬇

Pressure Converter

Convert Pa/psi/atm/bar units ⚡

Energy Converter

Convert joules/calories/BTU 💡

Power Converter

瓦特、马力、BTU/h等功率单位互转 ⛽

Fuel Economy Converter

Convert L/100km and MPG 👕

Clothing Size Converter

Intl clothing size chart HOT 👟

Shoe Size Converter

Intl shoe size conversion chart HOT 💍

Ring Size Converter

Ring size to inner diameter chart 🍳

Cooking Unit Converter

Convert cups/tbsp/ml/grams HOT 📄

Paper Size Reference

A/B series & letter paper sizes 🖥

Screen Resolution Guide

Common screen resolutions & DPI 🔤

Typography Unit Converter

Convert pt/px/em/rem font units 🔧

Torque Converter

Convert Nm/ft-lbs torque units 🌊

Flow Rate Converter

Convert L/s, GPM flow rate units 💡

Illuminance Converter

Convert lux/foot-candle units 📡

Frequency Converter

Convert Hz/kHz/MHz/GHz units 👙

Bra Size Converter

International bra size chart 🚗

Tire Size Calculator

Decode tire specs & dimensions 🔌

Wire Gauge Reference

AWG wire gauge to area chart 🪵

Lumber Size Guide

Nominal vs actual lumber sizes 🎩

Hat Size Guide

Head circumference to hat size 🚲

Bicycle Size Guide

Height to bike frame size chart ⌚

Watch Size Guide

Wrist size to watch dial guide 🌡

Body Temperature Guide

Normal body temp & fever range 👕

Care Symbols Guide

Laundry care symbol meanings 🔌

International Plug Guide

Worldwide power plug & voltage NEW 🕐

Timezone Offset Calculator

UTC offset & DST calculation NEW 🗺

Map Scale Calculator

Map scale to real distance calc ⚡

Power Converter

瓦特马力千瓦等功率单位换算 NEW 🧪

Density Converter

Convert density units kg/m3 etc NEW 💪

Force Converter

Convert newtons, dynes, kgf etc NEW ⚖

Weight Converter

Convert kg, lb, oz, stone etc NEW

🍅

Pomodoro Timer

25min focus + 5min break timer HOT ⏱

Countdown Timer

Online countdown timer tool HOT 🌍

World Clock

Multi-city real-time clock display HOT 💰

Meeting Cost Calculator

Real-time meeting cost tracker HOT 💵

Hourly Rate Converter

Convert annual/monthly/hourly rate 📅

Workday Counter

Count workdays between dates ⏰

Overtime Pay Calculator

Calculate overtime pay by hours 📖

Reading Time Estimator

Estimate reading time by word count HOT ⌨

Typing Speed Test

Test typing speed in WPM 📋

Project Deadline Calculator

Calculate deadline from workdays 🌐

Timezone Meeting Planner

Find best time across timezones 💼

Salary Comparison Calc

Compare salary across time units 💻

Freelance Rate Calculator

Calculate freelance hourly rate ✅

Habit Streak Tracker

Track consecutive habit days 🎯

Focus Session Guide

Deep work & focus training tips 🍽

Daily Calorie Tracker

Track daily meal calorie intake 📝

Weekly Review Template

Weekly review & planning template 🎯

OKR Planner

OKR goal setting guide 📧

Email Subject Line Guide

Email subject line writing tips 🔑

Password Change Reminder

Password age & change reminder 🌍

Timezone Reference

Global timezone UTC offset lookup ⌨

Keyboard Shortcuts Guide

VS Code/Figma/Chrome shortcuts 🔍

Regex Cheatsheet

Common regex patterns & examples 📦

Git Workflow Guide

Feature Branch/Gitflow workflows 👀

Code Review Guide

PR code review best practices 📄

Invoice Template Guide

Freelancer invoice essentials 🏠

Remote Work Guide

WFH productivity best practices NEW 🗣

Daily Standup Template

Agile daily standup format guide 📋

Sprint Planning Guide

Scrum Sprint planning reference NEW 🔄

Retrospective Template

Agile retrospective meeting guide ⚡

Reaction Speed Test

Test reaction time with color change NEW 🖥

Dead Pixel Test

Full-screen color test for dead pixels NEW 🎤

Microphone Test

Test if your microphone works NEW 📹

Webcam Test

Test webcam video and parameters NEW ⌨

Keyboard Test

Test every key on your keyboard NEW ⌨

打字练习

分级段落打字训练提升速度准确率 NEW 🖐

盲打指法练习

分区域训练标准十指盲打指法 NEW ⚡

快捷键练习

练习常用键盘快捷键闯关计分 NEW 🎮

单词打字游戏

打字消除掉落单词练速度学词汇 NEW 🔢

数字键盘练习

小键盘数字录入速度训练 NEW 🎵

Online Metronome

Adjustable BPM music metronome NEW 🎨

Online Whiteboard

Free online drawing whiteboard NEW 🎤

Microphone Test

Test if your microphone works NEW 📹

Webcam Test

Test webcam video and parameters NEW 🎵

Online Metronome

Adjustable BPM music metronome NEW

📱

Social Media Image Sizes

Platform cover/avatar/post sizes HOT 🖨

Print DPI Calculator

Calculate print size from px & DPI 📐

Image Aspect Ratio Calc

Calculate & convert aspect ratios HOT 🌐

Favicon Size Guide

Browser & device favicon sizes NEW 📱

App Icon Sizes

iOS/Android/PWA icon sizes NEW 🪪

ID Photo Sizes

Passport & visa photo sizes HOT 📱

Device Screen Sizes

Phone/tablet/desktop resolutions 🖼

Photo Print Guide

Common photo sizes & print quality 🗂

Poster Sizes Guide

A-series & standard poster sizes 🎬

Video Thumbnail Guide

YouTube/Twitch thumbnail specs 🗜

Image Compression Guide

JPEG/PNG/WebP/AVIF compression tips HOT 🔗

OG Image Guide

OG & Twitter Card image specs 📧

Email Image Guide

Email marketing image best practices ✨

Retina Display Guide

High DPI @2x/@3x image handling 🎨

SVG Basics Guide

SVG format features & use cases 🖼

Image Format Comparison

JPEG/PNG/WebP/GIF/AVIF comparison 📷

Stock Photo Resources

Free commercial-use photo sites 💧

Watermark Guide

Image watermark best practices 🎨

Color Profile Guide

sRGB/Adobe RGB/CMYK color spaces 📁

Batch Image Processing

Batch resize/rename/convert tools ✨

Design Inspiration

Quality design inspiration sites 🎨

Figma Shortcuts

Figma keyboard shortcuts & tips 🏢

Logo Design Guide

Logo design principles & styles 🔤

Typography Guide

Font selection & typesetting guide NEW 🖌

UI Design Patterns

Button/form/nav UI pattern guide 🔲

Iconography Guide

Line & filled icon design rules 🎨

Color Grading Guide

Color temp & saturation basics 📊

Infographic Guide

Infographic layout & data viz NEW ✨

Motion Design Guide

UI motion timing best practices NEW 🎨

Design System Guide

Component lib & design tokens NEW 🖼

Screenshot Beautifier

Add background, shadow to screenshots NEW