JS Formatter
Pretty-print or minify JavaScript in your browser. The result updates as you type.
Input
Mode
Convert to
Output
Private by design
This conversion runs entirely in your browser. Your text is not sent to a server.
Tip
Format pretty-prints. Minify compresses whitespace. These helpers are for reading and shipping snippets, not a full language toolchain.
How to convert with JS Formatter
Paste HTML, CSS, or JavaScript in the input box.
The formatted result updates as you type — nothing is uploaded.
Choose Format or Minify, or Convert to to open another formatter.
Copy the result. This is a local pretty-printer, not a compiler.
When should you use it?
HTML
Indent tags so a pasted fragment is easier to read.
CSS
Pretty-print rules, or minify before you embed a snippet.
JavaScript
Add line breaks around braces and semicolons for a quick read.
Stays here
Code never leaves this tab.
Your code stays private.
Formatting runs entirely in your browser. Snippets never leave this tab.
About formatting HTML, CSS, and JavaScript in the browser
HTML, CSS, and JS formatters pretty-print or minify snippets as you type. They are local helpers for reading and shipping copy-paste, not a compiler, not ESLint, not PostCSS, and not a browser. Format vs minify is a whitespace choice. Convert to jumps between HTML, CSS, and JS with separate persist keys.
Worked example: a one-line <div><span>x</span></div> becomes indented tags. A minified CSS rule block expands onto separate properties. Syntax that is badly broken may still look odd after format — the point is readability, not a guaranteed AST round-trip.
Related: HTML Encode for entities, JSON Formatter for data, Markdown → HTML for notes. Nothing is uploaded. Do not treat format as XSS sanitization.
Related code tools
HTML Formatter
Pretty-print or minify HTML in your browser. The result updates as you type.
CSS Formatter
Pretty-print or minify CSS in your browser. The result updates as you type.
HTML Encode / Decode
Encode or decode HTML entities. Type or paste below — the result updates as you type.
JSON Formatter
Pretty-print JSON with indentation, optional key sorting, and minify. The result updates as you type.
JS Formatter examples
Format
Format vs minify
| Mode | Example | Typical use |
|---|---|---|
| Format | a { | Readability, reviews, and diffs |
| Minify | a{color:red;} | Smaller snippets for shipping or embedding |
JS Formatter FAQ
No. It adds line breaks around braces and semicolons for a quick read, or minifies whitespace. It is not ESLint, not a bundler, and not Node. Syntax errors may still pretty-print poorly.
Treat this as a JS snippet helper. JSON → TypeScript is the sibling when the input is JSON, not source. Keep production secrets off shared machines.
No. Formatting stays in this browser. Convert to opens HTML or CSS formatters.