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JavaScript Formatter & Beautifier

Format and beautify JavaScript with proper indentation. Free online JS formatter based on braces and brackets. Zero dependencies.

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What is JavaScript Formatter & Beautifier?

A JavaScript formatter takes minified or messy code and reformats it with proper indentation based on braces, brackets, and statement structure. This makes code readable for debugging, code review, and learning. The formatter uses a zero-dependency approach with brace-level tracking.

How to Use

  1. Paste your JavaScript code in the input area
  2. The formatted code appears instantly in the output panel
  3. Indentation is applied based on brace and bracket nesting
  4. Download the result as a .js file

Examples

Format minified JS

Inputfunction greet(name){const msg='Hello, '+name;console.log(msg);return msg;}
Outputfunction greet(name) { const msg = 'Hello, ' + name; console.log(msg); return msg; }

Format with objects

Inputconst data={name:'Alice',scores:[90,85,92]};if(data.scores.length>0){console.log(data);}
Outputconst data = { name: 'Alice', scores: [90, 85, 92] }; if (data.scores.length > 0) { console.log(data); }

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Frequently Asked Questions

How does this differ from the JS Minifier tool?

The JS Minifier uses Terser for professional minification and beautification. This JavaScript Formatter is a simpler, zero-dependency beautifier that handles basic formatting based on brace/bracket tracking. It is lightweight and runs entirely with pure browser JS.

Does it handle arrow functions and template literals?

Yes. Arrow functions, template literals, destructuring, and other modern JavaScript syntax are handled. String content inside quotes and backticks is preserved without modification.

Is the formatting always correct?

This is a basic formatter using brace-level tracking, not a full AST-based formatter like Prettier. It works well for most common code patterns but may not perfectly handle edge cases like complex expressions or chained method calls.