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    JavaScript FormatterFree Online Developer Tool

    JavaScript Formatter is a free online developer tool. Free JavaScript formatter and beautifier online. Add proper indentation to make JS readable.

    Input JavaScript
    Formatted JavaScript
    100% Private100% Private
    InstantInstant
    Any DeviceAny Device
    Free ForeverFree Forever
    How to useHow to use & Tips

    Steps

    1. 1Paste your JavaScript code into the 'Input JavaScript' box
    2. 2Click 'Load Sample' to try with example JavaScript
    3. 3Choose your preferred indentation size (2 or 4 spaces)
    4. 4Click 'Format JS' to beautify the code
    5. 5Copy the formatted JavaScript using the copy button

    Use Cases

    • -Minified Code Analysis — Beautify minified JavaScript from production bundles to understand and debug the code.
    • -Code Review — Standardize JavaScript formatting across your team for consistent, readable code.
    • -Third-Party Scripts — Format obfuscated or minified third-party scripts to understand their behavior.
    • -API Response Debugging — Format JSON-like JavaScript objects returned from APIs for easier inspection.

    About JavaScript Formatter

    Everything you need to know about this tool and how to get the most out of it.

    What is JavaScript Formatter?

    What is JavaScript Formatter?

    JavaScript formatting transforms minified or poorly structured code into clean, readable code with proper indentation. Our free JS Formatter instantly beautifies any JavaScript, making it easy to read, debug, and understand.
    How JavaScript Formatter Works

    How JavaScript Formatter Works

    Paste your JavaScript code, choose an indentation size, and click Format. The formatter parses the code structure and adds proper indentation and line breaks.
    Why Use JavaScript Formatter?

    Why Use JavaScript Formatter?

    Modern JavaScript build tools minify code for production, removing all whitespace to reduce file size. While efficient for browsers, minified code is unreadable for developers. Formatting restores the structure, making it possible to understand logic, find bugs, and learn from the code.
    Tips

    Tips & Best Practices

    • 12 spaces is the most popular choice in modern JavaScript projects (used by React, Vue, and Next.js) — it balances readability with compact code while keeping files smaller.
    • 2Tools like Prettier have made consistent formatting automatic in many workflows — use this tool for quick one-off formatting tasks or when Prettier isn't configured in your project.
    • 3Use this tool for quick formatting tasks without setting up a full toolchain — it's especially useful for understanding third-party scripts and production code bundles you encounter online.

    Frequently Asked Questions