Online JavaScript Formatter

JavaScript

Online JavaScript formatter that works directly in your browser. Format and beautify JavaScript code instantly without downloading software. It runs in your browser, and your input stays on this device.

Back to JavaScript Formatter

Formatter example

Compare the exact input shape with the cleaned output before opening the editor.

Local preview

Before

input
const user={name:'Ada',roles:['admin','editor']};

After

formatted
const user = { name: 'Ada', roles: ['admin', 'editor'] };

Workflow

Use JavaScript without sending code.

Paste a snippet, run the action, review any highlighted issue, then copy the result back to your work.

Current language
JavaScript
Current action
JavaScript Formatter
  1. 01

    Start

    Paste a snippet or full file into the editor.

  2. 02

    Run

    Use Run JavaScript Formatter from the action bar.

  3. 03

    Review

    Fix syntax issues if processing stops.

  4. 04

    Move

    Use Copy code when the result is ready.

Files
.js, .jsx, .mjs
Paste a JavaScript snippet or a full source file.
Engine
web_fmt
Runs the browser-side formatter for readable output.
Privacy
Local run
The editor does not send pasted code to a formatting API.
Result
Readable output
Move the formatted code back to your editor.