JavaScript Formatter

JavaScript Formatter — Overview

The JavaScript Formatter beautifies minified or unformatted JavaScript code into clean, readable code with consistent indentation, spacing, and line breaks. It also provides a minifier mode to strip all unnecessary whitespace and comments, reducing file size for production deployment. Modern JavaScript build pipelines typically minify code automatically, but when you receive or need to inspect a minified bundle — perhaps to debug an issue, understand a third-party library, or review auto-generated code — manually formatted JS is essential. The formatter handles all modern JavaScript syntax including ES2020+ features, arrow functions, destructuring, template literals, async/await, and optional chaining. You can configure indentation width (2 or 4 spaces) and choose whether to preserve or strip comments. All formatting happens client-side with no code ever sent to a server.

Common Use Cases

• Beautifying minified third-party JavaScript to understand or debug it
• Cleaning up auto-generated or concatenated JavaScript before code review
• Minifying JavaScript files to reduce bundle size for production deployment
• Reformatting inconsistently indented code to a consistent style before committing

How to Use This Tool

Paste your JavaScript code into the input editor. Click Format to beautify it with proper indentation and spacing, or click Minify to strip all whitespace for production use. Select your preferred indentation size (2 or 4 spaces) from the options. The result appears in the output panel, ready to copy.