JavaScript Beautifier
Beautify minified or messy JavaScript with consistent indentation — instantly inside your browser.
What does this tool beautify?
JavaScript that's been minified or machine-generated can be hard to read — this tool re-indents JavaScript based on its brace nesting structure, so blocks line up consistently and the code becomes easy to scan.
GuideHow to use it
How the beautifying works
Each language uses its own nesting rules: HTML tracks opening and closing tags, CSS and JavaScript track curly braces. As the code is walked, each new nested block is indented one level deeper, and closing brackets or tags pull the indentation back out.
Why it helpsFeatures & benefits
Why this runs entirely in your browser
Beautifying runs in JavaScript locally in the tab, which means it keeps working offline once the page has loaded and nothing pasted here is ever sent to a server.
Common uses
Making a minified file readable for debugging, or cleaning up code before a code review.
Frequently asked questions
A few things people usually want to know before trusting the numbers.
No. Only whitespace and line breaks are adjusted — the actual logic is preserved exactly.
No — it uses bracket-based indentation rules rather than a full JavaScript parser, so it works well for typical code but may not perfectly handle every edge case, like braces inside strings or template literals.
This tool only beautifies (adds formatting). Use the dedicated JavaScript Minifier to go the other direction.
Yes. Clicking a different language switches the page while keeping the code you've already entered for each language separately.
No. All beautifying happens locally in your browser. Nothing pasted here is sent to a server, stored, or shared.