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Code Formatting
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JSON Formatter

Format, validate, and beautify JSON data. Features include custom indentation, key sorting, and error detection.

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About this tool

About JSON Formatter & Beautifier

Large, unformatted JSON files are notoriously difficult to read and debug. Our JSON Formatter & Beautifier is designed to transform messy payloads into clean, human-readable code in milliseconds. Whether you're debugging an API response, preparing documentation, or cleaning up a config file, this tool provides the precision you need with zero data leaving your browser.

How to use JSON Formatter & Beautifier

  1. 1

    Paste your raw or minified JSON string into the 'Input' text area.

  2. 2

    Optionally select your indent size and toggle 'Sort Keys' if needed.

  3. 3

    Click the 'Format' button to instantly beautify your code.

  4. 4

    Review any validation errors or download the result as a .json file.

Key features

  • Real-time JSON validation with line-number error reporting
  • Customizable indentation (2, 4, or 8 spaces) to match your team's style
  • Alphabetical key sorting to easily compare different JSON objects
  • One-click minification for production deployment and payload reduction
  • Safe browser-side processing—your sensitive data never touches our servers

Why use this tool?

  • Save time debugging complex nested API responses
  • Improve code readability for team reviews and documentation
  • Reduce file sizes significantly using the minify feature
  • Maintain privacy by formatting local configuration files securely

Frequently asked questions

Is it safe to paste sensitive JSON data here?
Yes. Our JSON Formatter works entirely on the client side. This means the formatting logic runs in your own browser's memory, and your JSON data is never uploaded to our servers or stored anywhere.
How does the error detection work?
We use a robust parsing engine that identifies syntax errors (like missing commas or mismatched brackets) and provides the exact line and column number where the error occurred.
Can I format very large JSON files?
Absolutely. The tool is optimized for performance and can handle multi-megabyte JSON strings comfortably without freezing your browser.
Does it support sorting keys alphabetically?
Yes, you can toggle the 'Sort Keys' switch to recursively sort all object keys in alphabetical order, which is perfect for identifying diffs between two JSON files.

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