# EZ4Code

> EZ4Code (易知码, ez4code.com) is a free developer reference site with cheatsheets, code snippets, online tools, shortcuts, quizzes, and API reference for 25+ programming languages. Find code answers in 30 seconds, not minutes. 让代码一点就通。

EZ4Code (易知码) 是专业的编程技术基础教程和开发者工具网站,提供 Python、JavaScript、Java、Go、TypeScript、HTML、CSS、MySQL、PHP、Linux、Ruby、C 语言等编程语言的速查表、代码片段和在线工具。菜鸟教程、机器学习、JSON 格式化等编程资源,永久免费,无需注册,支持 9 种语言(英/中/日/西/法/德/葡/韩/俄)。

## Main Sections
- [Cheatsheets](https://ez4code.com/cheatsheets): Quick reference for 25+ programming languages including Python, JavaScript, TypeScript, Go, Java, Rust, and more.
- [Snippets](https://ez4code.com/snippets): Copy-paste code snippets for common programming tasks.
- [Tools](https://ez4code.com/tools): 296+ free online developer tools — JSON formatter, Base64, regex tester, color picker, QR generator, and more.
- [AI Guides](https://ez4code.com/ai): AI/ML concept guides and tutorials with code examples. Covers Claude Code, Cursor, Trae, MCP, AI Agents, LLMs.
- [Shortcuts](https://ez4code.com/shortcuts): Keyboard shortcuts for popular applications.
- [Quizzes](https://ez4code.com/quizzes): Interactive quizzes to test your programming knowledge.
- [API Reference](https://ez4code.com/reference): Detailed method reference for Python, JavaScript, Go, Rust, Java, and TypeScript.
- [Certificates](https://ez4code.com/certificates): Earn certificates by completing quizzes and AI guides.

## Popular Cheatsheets
- [Python Cheatsheet](https://ez4code.com/cheatsheets/python): Python syntax reference — data types, control flow, functions, classes, modules, file I/O.
- [JavaScript Cheatsheet](https://ez4code.com/cheatsheets/javascript): JS syntax reference — ES6+, arrays, objects, promises, async/await.
- [TypeScript Cheatsheet](https://ez4code.com/cheatsheets/typescript): TS types, interfaces, generics, utility types.
- [Go Cheatsheet](https://ez4code.com/cheatsheets/go): Go syntax — goroutines, channels, structs, interfaces.
- [Java Cheatsheet](https://ez4code.com/cheatsheets/java): Java reference — classes, generics, streams, collections.
- [Rust Cheatsheet](https://ez4code.com/cheatsheets/rust): Rust ownership, borrowing, lifetimes, traits.
- [SQL Cheatsheet](https://ez4code.com/cheatsheets/sql): SQL queries — SELECT, JOIN, GROUP BY, subqueries.
- [HTML Cheatsheet](https://ez4code.com/cheatsheets/html): HTML5 semantic tags, forms, accessibility.
- [CSS Cheatsheet](https://ez4code.com/cheatsheets/css): CSS layout, flexbox, grid, animations.
- [React Cheatsheet](https://ez4code.com/cheatsheets/react): React hooks, components, patterns.
- [Git Cheatsheet](https://ez4code.com/cheatsheets/git): Git commands — branch, merge, rebase, stash.
- [Bash Cheatsheet](https://ez4code.com/cheatsheets/bash): Shell scripting — variables, loops, pipelines.

## Popular Tools
- [JSON Formatter](https://ez4code.com/tools/json-formatter): Format, validate, and minify JSON.
- [Base64 Encoder/Decoder](https://ez4code.com/tools/base64): Encode and decode Base64 strings.
- [UUID Generator](https://ez4code.com/tools/uuid-generator): Generate RFC4122 UUIDs.
- [JWT Decoder](https://ez4code.com/tools/jwt-decoder): Decode JWT header and payload.
- [Hash Generator](https://ez4code.com/tools/hash-generator): MD5, SHA-1, SHA-256, SHA-512 hashes.
- [Regex Tester](https://ez4code.com/tools/regex-tester): Test regular expressions with live matching.
- [Color Tool](https://ez4code.com/tools/color-tool): Color picker, converter, palette generator.
- [QR Code Generator](https://ez4code.com/tools/qr-code-generator): Generate QR codes from text or URLs.
- [Timestamp Converter](https://ez4code.com/tools/timestamp-converter): Convert Unix timestamps to dates.
- [SQL Formatter](https://ez4code.com/tools/sql-formatter): Format and beautify SQL queries.

## AI Guides
- [Claude Code](https://ez4code.com/ai/claude-code): Anthropic's CLI AI coding agent.
- [Cursor IDE](https://ez4code.com/ai/cursor): AI-powered code editor.
- [Trae](https://ez4code.com/ai/trae): ByteDance's AI IDE.
- [MCP](https://ez4code.com/ai/mcp): Model Context Protocol — connect AI to external tools.
- [AI Agents](https://ez4code.com/ai/agents): Autonomous AI systems for coding tasks.

## Supported Languages
Content available in 9 languages: English, 中文, 日本語, Español, Français, Deutsch, Português, 한국어, Русский.

## Company
- [About](https://ez4code.com/about): About EZ4Code — our mission and team.
- [Contact](https://ez4code.com/contact): Contact us for questions, feedback, or partnerships.
- [Privacy Policy](https://ez4code.com/privacy): How we handle data and cookies.
- [Terms of Service](https://ez4code.com/terms): Terms of use for EZ4Code.

## Sitemap
- [XML Sitemap](https://ez4code.com/sitemap.xml): Complete list of indexable URLs.
- [Full Content Index for AI](https://ez4code.com/llms-full.txt): Comprehensive content map with all tool names, descriptions, and entity definitions.