JS Beautifier

Free JS Beautifier

JS Beautifier formats your JavaScript code with proper indentation, consistent spacing, and organized structure so you can read, debug, and maintain it easily. We built six JavaScript formatting utilities into one workspace so you can beautify, minify, check syntax, format JSON, format JSX, and deobfuscate JavaScript without installing software or creating an account. Paste your code into the editor, upload a file from your computer, or drag and drop it onto the workspace. Your code stays on your device because all processing happens locally in your browser.

Online JS Beautifier with Configurable Formatting

Reading minified or poorly formatted JavaScript is frustrating when hundreds of statements run together on a single line without indentation or spacing. Variable declarations blur into function calls, nested conditionals become impossible to follow, and finding a specific block of logic means scanning through a wall of characters. Our JS Beautifier solves this by parsing your code and applying consistent formatting rules that you control through the options dock.

Upload JavaScript Files From Your Computer

You can load JavaScript into the workspace three ways: paste it into the code editor on the left, drag and drop a file anywhere onto the workspace, or click the Upload File button in the toolbar. We accept .js, .jsx, .ts, .tsx, .mjs, .cjs, and .json files. Because everything runs in your browser, there is no upload size limit imposed by a server and your files never leave your machine. This makes the beautifier safe for proprietary code, production bundles, and files containing sensitive configuration data.

Choose Your Formatting Preferences

The options dock below the toolbar lets you customize formatting in real time. Select an indent size of 2, 4, or 8 spaces, or switch to tabs. For JavaScript beautification, choose a brace style: Collapse keeps opening braces on the same line, Expand places them on a new line, and End-Expand puts closing braces on their own line. The size comparison indicator shows you the before and after file sizes so you can see the formatting impact immediately.

Validate, Minify, and Deobfuscate JavaScript

Beyond beautifying, you often need to work with JavaScript in other ways. The Syntax Checker parses your code through the browser JavaScript engine and reports any syntax errors with descriptive messages and line numbers. The JS Minifier strips comments and whitespace to produce a compact version for production use. The Deobfuscator takes compressed or minified third-party scripts and reformats them into structured, readable code so you can understand what they do.

Format JSON and JSX Code

Two additional tools handle specific formats. The JSON Beautifier parses your JSON string, validates its structure, and reformats it with your chosen indentation. If the JSON is invalid, you get a clear error message pointing to the problem. The JSX Formatter applies the same beautification engine with JSX-aware parsing so that React component code, nested elements, and embedded expressions are properly indented and structured.

Your JavaScript Stays Private in Your Browser

We process everything locally using the js-beautify library loaded directly in your browser. No server requests, no cookies, no account required. You can safely format production code, proprietary business logic, and configuration files containing API keys knowing that nothing is transmitted anywhere. Close the browser tab and your code is gone.

Related JavaScript and Code Tools

If you work with JavaScript regularly, these tools complement what you can do here:

• JSON Formatter -- format, minify, validate, and transform JSON data
• HTML Beautifier -- beautify and indent HTML with syntax highlighting
• CSS Beautifier -- beautify, format, and organize CSS stylesheets
• CSS Formatter -- format and prettify CSS code for readability
• HTML Checker -- validate HTML for errors and standards compliance
• Code Formatter -- format code across multiple programming languages