JavaScript Formatter & Beautifier

What is a JavaScript Formatter & Beautifier?

A JavaScript formatter (also called a JS beautifier or JS prettifier) is a tool that takes unorganized, minified, or inconsistently written JavaScript code and restructures it with standardized indentation, proper spacing, and consistent line breaks. JavaScript is the programming language of the web, used in everything from simple interactive elements to complex single-page applications and server-side Node.js services. Production JavaScript bundles are routinely minified to reduce size, making them impossible to read without a formatter. The JavaScript Formatter's JavaScript beautifier parses your code using a modern ECMAScript parser that supports ES2022+ syntax including optional chaining, nullish coalescing, async iterators, and class fields.

How to Use JavaScript Formatter & Beautifier

1. Paste your JavaScript code — minified or unminified — into the left input panel.
2. Use 'Sample' to load an example and see the formatter in action.
3. Adjust the indent size to match your team's coding style (2 or 4 spaces recommended).
4. Click ⚡ Format or press Ctrl+Enter — your code is formatted and syntax-highlighted instantly.
5. Review the output in the right panel for clean, readable JavaScript.
6. Click Copy to use the result immediately, or Download to save it as a .js file.

Frequently Asked Questions