About the JavaScript Formatter / Beautifier
Debugging minified or unformatted JavaScript in production logs and bundle outputs is challenging. This JavaScript Formatter transforms dense, single-line JS code into structured, human-readable scripts with consistent brace placement, loop nesting, and operator spacing.
This tool is designed for developers debugging frontend bundles, reverse-engineering client scripts, or cleaning up unformatted code snippets before adding them to repositories. It formats functions, conditional blocks, object literals, and arrays with customizable indentation.
To use it, paste your JavaScript snippet into the input box and choose 2 or 4 spaces for indentation. Click 'Format JavaScript' to beautify the code instantly. You can inspect line counts, copy the output, or download the formatted script as a .js file.
For example, a compressed function like 'function sum(a,b){if(!a)return 0;return a+b;}' is expanded into properly formatted lines with clear block hierarchy and consistent indentation.
A common debugging mistake is attempting to read minified stack traces without beautifying the underlying code first. Formatting restores readability so you can trace logic flow and variable assignments effortlessly.
Tip: For TypeScript code with interfaces and generic types, use our dedicated TypeScript Formatter tool.