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JSON Formatter

JSON Formatter

Format, validate, minify, and beautify JSON data instantly in your browser.

Formatted JSON output

Configure inputs and run the tool

Results will appear here

About this JSON Formatter

The JSON Formatter is a free online tool that helps you format, validate, and minify JSON data instantly. JSON (JavaScript Object Notation) is the most widely used data interchange format on the web, powering APIs, configuration files, and data storage. Whether you're debugging an API response, cleaning up messy JSON, or checking if your data is valid, our JSON formatter makes it quick and easy — all processing happens in your browser, so your data never leaves your device.

How to use the JSON Formatter

  1. 1 Paste your JSON data into the input box above.
  2. 2 Choose an action: Format/Beautify to make it readable, Minify to compress it, or Validate to check for errors.
  3. 3 Click the Run button (or press Ctrl+Enter) to process your JSON.
  4. 4 Copy the formatted output or download it as a text file.

Frequently Asked Questions

What is a JSON Formatter?
A JSON formatter takes raw, unformatted JSON data and adds proper indentation and line breaks to make it human-readable. It helps developers debug API responses, inspect data structures, and validate that JSON is syntactically correct.
Is my JSON data secure?
Yes! All processing happens directly in your browser using JavaScript. Your JSON data is never uploaded to any server or stored anywhere. This makes our JSON formatter safe for sensitive data like API keys, tokens, and personal information.
What's the difference between formatting and minifying JSON?
Formatting (beautifying) adds indentation, line breaks, and spacing to make JSON readable by humans. Minifying removes all unnecessary whitespace to create the smallest possible file size — ideal for production API responses where bandwidth matters.
Can this tool validate if my JSON is correct?
Yes! Select the "Validate Only" option and our tool will check your JSON syntax and report any errors with their exact location. It also shows the number of keys and data type detected.
How do I fix "Invalid JSON" errors?
Common JSON errors include missing commas, trailing commas, unquoted keys, and mismatched brackets. Our validator points out the error message. Check that all keys are double-quoted, there are no trailing commas after the last item, and all brackets/braces are properly matched.

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