JavaScript Formatter — Beautify & Minify JS Online Free
Beautify or minify JavaScript with custom indent, quote style, Terser compression, syntax highlighting, and one-click download — all private in your browser.
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Beautify options
Indent
Quote style
How to Use
Step-by-step guide to get the most from this tool
- 1
Paste JavaScript
Drop minified or messy JS into the input panel.
- 2
Choose mode
Select Beautify with indent options, or Minify with compression settings.
- 3
Review output
Read syntax-highlighted output with line numbers.
- 4
Copy or download
Copy to clipboard or download as a .js file.
Features
What makes this tool stand out
Syntax highlighting
Keywords, strings, numbers, and comments colored.
Indent control
2 spaces, 4 spaces, or tabs.
Terser minify
Mangle, compress, and strip comments.
Parse errors
Clear error messages for invalid JS.
Download
Save output as a .js file.
Offline-ready
Client-side only — no server.
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Frequently Asked Questions
Quick answers to common questions
How do I beautify minified JavaScript?+
Paste your code, choose Beautify mode, set indent and formatting options, and read the formatted output with syntax highlighting instantly.
How does minify mode work?+
Minify uses Terser in your browser to remove comments, optionally mangle variable names, and compress expressions for a smaller output file.
What if my JavaScript has syntax errors?+
Invalid syntax shows a clear parse error message. Fix the error in your input and the output updates automatically.
Does this support modern ES6+ syntax?+
Yes. Both js-beautify and Terser support modern JavaScript including async/await, classes, and modules syntax.
Is my code sent to a server?+
No. Beautify and minify run entirely in your browser with no network requests.
Can I download formatted output?+
Yes. Use the Download button to save output as a .js file.
Free?+
Yes.