JSON Formatter & Validator

Beautify, minify, and debug JSON data locally. No server uploads.

Ready
Input / Raw JSON Paste messy code here
Output / Result

Why Use This JSON Tool?

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Private & Secure

JSON often contains sensitive API keys or user data. This tool runs 100% in your browser—your code is never sent to our servers.

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Instant Validation

Quickly spot syntax errors. Whether it's a missing comma or an extra bracket, we'll help you find the bug in seconds.

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File Support

Working with large config files? Upload your .json files directly to format them without crashing your browser.

Common JSON Errors We Fix

JSON (JavaScript Object Notation) is strict. A single mistake breaks the whole file. Here are common issues developers face:

  • Trailing Commas: Leaving a comma after the last item in a list ([1, 2,]) is invalid in standard JSON.
  • Single Quotes: JSON keys and strings must use double quotes ("key"), not single quotes ('key').
  • Unescaped Characters: Special characters inside strings must be properly escaped using backslashes.