JS Formatter / Minifier
Beautify or compress JavaScript code snippets. Format JavaScript for readability or minify it for production use. Useful for code optimization and development.
JavaScript Input
Formatted Output
Formatted JavaScript will appear here
About JavaScript Formatter
This tool formats and beautifies JavaScript with js-beautify, or minifies it with terser (dead-code elimination, mangling, comment stripping) — entirely in your browser. Paste, upload, or load the sample and the result appears instantly. Note that minification is compression, not obfuscation or encryption.
About JS Formatter / Minifier
A JavaScript formatter and minifier is an essential development tool that beautifies unreadable JavaScript code with proper indentation, spacing, and structure for improved readability, or compresses JavaScript by removing whitespace, comments, and unnecessary characters to reduce file size. This tool supports both development workflows and production optimization needs.
Why use a JS Formatter / Minifier?
Using a JavaScript formatter enhances code readability and maintainability, making debugging and collaboration easier, while the minifier drastically reduces file sizes for faster script loading and improved website performance. It ensures consistent coding standards across development teams, and optimizes JavaScript delivery without affecting functionality, resulting in better user experience and SEO rankings.
Who is it for?
This tool is crucial for JavaScript developers formatting code for better readability and maintenance, front-end developers optimizing scripts for production deployment, Node.js developers preparing server-side code, development teams maintaining consistent code formatting standards, and anyone working with JavaScript who needs to either beautify code for development or compress it for optimal performance in production environments.
How to use the tool
Paste your minified or unformatted JavaScript code into the input field
Choose Format mode for readable output or Minify mode for compression
Click the Format JS (or Minify JS) button to process your code; pasting, uploading a file or loading the sample runs it automatically
Review the formatted output with improved structure or optimized file size
Copy the processed JavaScript code for use in your development or production environment
Frequently Asked Questions
How do I format and beautify JavaScript code?
Paste your JavaScript into the input area (or upload a file, up to 5 MB). The tool re-indents with 2 spaces, uses same-line braces and normalizes spacing. There are no settings for indent size, quote style or semicolons, and it never adds or removes quotes or semicolons. Copy the formatted output. Runs entirely in your browser — your code never leaves the device. Useful for: cleaning up minified JS, formatting pasted code from documentation, debugging unreadable third-party scripts.
What's the difference between formatting and minifying JavaScript?
Formatting (beautifying) adds whitespace and indentation for human readability. Minifying removes whitespace and comments, renames local variables to short names (`u` instead of `userName`), and removes dead code for a smaller production file. Top-level names are not renamed. Use formatting during development; use minification for production. This tool offers both modes; switch with the Format / Minify toggle. Minification is compression, not obfuscation or encryption.
Is my code sent to a server?
No — formatting and minifying run entirely in your browser via JavaScript. Your code never reaches a server, never gets logged. Verify in DevTools' Network tab: the only request is the minifier's own code, loaded the first time you minify, never your script. Safe for proprietary code, business logic, or sensitive scripts.
Does this handle TypeScript, JSX, or modern syntax?
Format mode handles modern ES2020+ syntax (async/await, optional chaining, nullish coalescing, spread/rest) and detects JSX, so React components format correctly. TypeScript is not supported: type annotations and interfaces may be laid out badly. Minify mode needs valid JavaScript: it accepts modern syntax and ES modules (including top-level await) but not JSX or TypeScript, and shows the syntax error if it can't parse your code. Transpile JSX/TS to JavaScript first if you want to minify it.
Will formatting change my code's behavior?
Formatting only changes whitespace, so behavior is preserved, and the tool does not add or remove semicolons. Minifying rewrites the code: it renames local variables and removes dead code and `debugger` statements, which preserves behavior for normal code but can break code that depends on function-local variable names (for example via `eval`). One caveat with either mode: 'automatic semicolon insertion' (ASI) can interact with line breaks in surprising ways for code that omits semicolons, so test the output if your style is semicolon-less.
When should I use this tool instead of my editor's formatter?
This tool is for ad-hoc formatting and minifying (pasted code, online demos, learning), with fixed settings: 2-space indent and no quote or semicolon changes. For active development, set up auto-format on save in your editor so the whole team shares one configuration. This online tool is good for one-off cleanup and quick lookups.
Should I use semicolons or omit them?
Stylistic choice, and this tool does not change it: it keeps whatever semicolons your code already has. Either style is valid — pick one and apply consistently. With semicolons: explicit, no surprise ASI issues. Without semicolons: cleaner-looking, but watch for the few ASI traps (lines starting with `(`, `[`, `+`, `-`, `/`, or a template literal). For most use cases, semicolons are the safer default.
When should I format JS in development?
Always-on auto-format-on-save in your editor (VS Code, JetBrains, Sublime, etc.) eliminates manual formatting effort and ensures consistent style across the team. For one-off cleanup (paste-in code, copied from a tutorial, debugging minified production code), use this online tool. For production builds, minification normally happens automatically via your bundler, or use Minify mode here for a single file. The three layers (auto-format on save, ad-hoc formatting, production minification) cover all use cases.
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