JavaScript Beautifier (Format, Indent & Pretty Print JS Online)
Format minified or messy JavaScript with readable indentation, line breaks, and brace style. Paste bundled code, stack traces, or snippets to understand and debug faster—runs locally in your browser.
Free online tool. No signup required. All processing runs in your browser.
About this tool
Ideal after downloading production bundles, inspecting third-party scripts, or cleaning snippets before code review. Pair with a minifier when you need to ship optimized assets again.
What is JavaScript Beautifier (Format, Indent & Pretty Print JS Online)?
Beautification (pretty-printing) rewrites JavaScript with consistent indentation and line breaks without changing behavior, so humans can read minified or generated code.
How to use JavaScript Beautifier (Format, Indent & Pretty Print JS Online)
- Paste JavaScript (single-line minified is fine).
- Choose indentation width or brace preferences if the tool offers them.
- Copy the formatted output or save it to your editor.
Examples
Example input
function a(b){return b+1;}Example output
function a(b) {
return b + 1;
}FAQ
Will beautifying change how my code runs?
Correct beautifiers preserve semantics; always verify critical paths if you paste back into production.
Beautify vs minify?
Beautify is for humans; minify removes whitespace and shortens names for smaller downloads.
Are these tools free?
Yes. All tools on DevToolsHub are free to use.
Does the tool store my data?
No. Processing happens in your browser. We do not store or send your input to any server.
Can I use the output in production?
Yes. Use the result as you like; we do not claim any rights over the output.