JavaScript Beautifier — Format & Unminify JS Online
Beautify and format minified or messy JavaScript with readable indentation. Choose 2 spaces, 4 spaces or tabs, paste your code, and copy clean JS — all in your browser.
🔒 Runs entirely in your browser. Your input and output are never sent to a server or stored — fully private.
About this tool
Paste minified or messy JavaScript and this tool re-formats it into clean, readable code, with consistent indentation, spacing and line breaks. Choose two spaces, four spaces or tabs to match your project's style. It is great for inspecting a one-line bundle, making sense of code from someone else, or simply tidying a file before you commit it. Everything happens in your browser, so even proprietary or unreleased source code never leaves your machine.
Frequently asked questions
What does beautifying do, and which indentation should I choose?
Beautifying re-applies consistent indentation and spacing, puts statements and blocks on their own lines, and makes the structure of the code easy to follow. For indentation, pick whatever matches your codebase: two spaces is common in web and JavaScript projects, four spaces gives a more open look, and tabs let each developer set their own width. The choice is purely about appearance, not behavior.
Does beautifying change how my code runs?
No. Beautifying only adjusts whitespace and line breaks, so your JavaScript behaves exactly as before — it is the opposite of minifying, which compresses code for delivery. The tool is not a linter, transpiler or obfuscator: it will not fix bugs, modernize syntax or rename variables. If the input has a syntax error, the formatter may not be able to lay it out until you correct it.
Is my code uploaded anywhere?
No. All beautifying runs locally in your browser, so the JavaScript you paste is never sent to or stored on a server. You can safely format proprietary code, work in progress or snippets that contain API keys or other secrets, because none of it leaves your device.