JavaScript Formatter & Beautifier - Free Online

A JavaScript formatter takes compressed or poorly spaced JS and outputs clean, indented code. It aligns blocks, standardizes spacing, and spots common syntax issues, making scripts easier to read and debug. Use it for frontend bundles, snippets, or Node utilities without opening an IDE. Everything runs in your browser.

1. Paste JS: Add minified bundles, inline scripts, or utility functions.
2. Choose indentation: Select 2 or 4 spaces to match your style guide.
3. Get results: View formatted code instantly. Copy it or download as a .js file.

• Faster debugging: Clear indentation reveals missing braces or misplaced commas.
• Readable reviews: Share tidy code in pull requests or docs.
• Local privacy: Scripts stay on your device; nothing is uploaded.

Use case 1: Debug minified snippets

Beautify console snippets or third-party widgets before inspecting logic.

Use case 2: Code review prep

Format pasted code blocks for clearer PR comments or documentation.

Use case 3: Learning and onboarding

Clean up examples to teach newer teammates how a script flows.

Basic example

Input: function add(a,b){return a+b}
Output:

function add(a, b) {
  return a + b;
}

Advanced example

Input: Minified bundle with nested callbacks
Output: Multi-line, indented code showing function scopes clearly.

Unterminated strings

If parsing fails, look for missing quotes. The formatter points to the first error location.

Trailing commas in older targets

Some environments reject trailing commas. Remove them if the code targets older browsers.

• Keep 2-space indent for JS to match common style guides.
• Pair with the TypeScript formatter for TS files.
• After formatting, run linting in your project to catch stylistic rules.

• Format JSON using the JSON formatter.
• Clean CSS with the CSS formatter.
• Minify structured data using the JSON minifier.

Formatting happens locally in your browser. No JavaScript content is uploaded or stored.