Code Formatting

JavaScript Formatter

Format, compress and pretty-print JavaScript code.

输入 JavaScript
Formatted result
格式化结果将显示在这里

What is JavaScript Formatter?

JavaScript formatter beautifies JS code with proper indentation, making it easier to read, debug, and maintain.

Features

  • Format: Beautify with indentation
  • Minify: Compress for production
  • Syntax Highlighting: Color-coded output

Use Cases

  • Code review and debugging
  • Minified code analysis
  • Code style standardization

Frequently Asked Questions

Can formatting break my JavaScript?
No. Built on js-beautify, the tool only re-arranges whitespace and line breaks — no syntax rewriting. Note that minified code still has variable names like a and b after formatting: that renaming happened during minification, and only a source map can restore original names.
How does this relate to Prettier and ESLint?
This tool is for quickly reading deployed minified code or tidying pasted snippets. For team projects use Prettier (consistent formatting) plus ESLint (code quality), enforced in CI. They complement each other: quick look versus engineering guarantees.
2 spaces, 4 spaces, or tabs?
Follow the existing project; 2 spaces is the JS mainstream. What matters is repo-wide consistency enforced automatically via .editorconfig and Prettier, not which style is "correct".