Format & Pretty Print JavaScript
Turn minified or messy JavaScript into clean, readable code — or minify it back down with one click. Supports modern JS with syntax error reporting. All processing happens in your browser.
JavaScript Beautifier
Formatting Options
Parse Error
Warnings
Press Ctrl+Enter to beautify · Ctrl+Shift+M to minify
What this tool does not do
- Does not silently mangle code with syntax errors — it reports the first parse error with its line and column.
- Does not transpile TypeScript, JSX, decorators, or experimental language proposals.
- Very large files (over ~5 MB) may take a few seconds to process.
How It Works
Paste your code
Enter or paste any JavaScript code into the input area.
Choose options
Pick indent, semicolons, quotes, and brace style from the settings panel.
Format or minify
Beautify your code with one click, or minify it for production. Statistics and byte savings are shown instantly.
Frequently Asked Questions
What does the JavaScript beautifier do?
It formats minified or messy JavaScript code by adding proper indentation, line breaks, and structure, making code readable and maintainable. It can also minify code back down for production.
What options are available?
You can choose indent size (2, 4, 8 spaces, or tabs), semicolon handling (add, keep, or remove), quote style, brace placement, and how many empty lines to keep.
Is my JavaScript uploaded to a server?
No. All processing happens entirely in your browser. Your code never leaves your device.