JavaScript Formatter Online

About the JavaScript Formatter

The JavaScript Formatter (also called a JS Beautifier) takes minified, compressed, or poorly indented JavaScript code and transforms it into clean, readable, properly formatted code. It's an essential tool for any web developer.

Why Format JavaScript?

Reading Minified Code Production JavaScript is often minified — all whitespace, comments, and line breaks are removed to reduce file size. When you need to debug or understand minified code, a formatter is the first step.

Code Review Before reviewing a colleague's pull request, paste their JS through the formatter to ensure consistent indentation and style.

Learning from Source When studying third-party libraries or vendor scripts, formatting the code first makes it far easier to understand the logic flow.

Quick Cleanup Even in development, code can become messy. The formatter applies consistent spacing and indentation in one click.

What Gets Fixed

• Indentation — Consistent 2-space or 4-space indentation
• Line Breaks — Each statement on its own line
• Brace Placement — Consistent { and } positioning
• Semicolons — Optionally add or normalize semicolons
• Whitespace — Remove excess blank lines and trailing spaces

Supported JavaScript Syntax

• ES5, ES6+, ES2020+
• Arrow functions, template literals, destructuring
• Async/await, Promises
• Class syntax
• Import/Export (ESM)
• CommonJS (require, module.exports)
• JSX (React syntax — basic support)

Formatter vs Linter

A formatter only fixes style (spacing, indentation, line breaks). A linter checks for code quality issues like unused variables, unreachable code, or potential bugs. Tools like ESLint combine both. Our formatter focuses purely on making code readable.