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JSON Formatter

Format and validate JSON in real-time. All processing happens locally.

Real-time mode
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What is JSON Formatter?
 
JSON Formatter is a developer tool that takes minified or unformatted JSON data and presents it in a human-readable, properly indented structure. It helps developers debug API responses, configuration files, and data structures by making them easier to read and understand.
 
 
 
Why use this JSON Formatter?
 
     
  • 100% Local Processing — Your data never leaves your browser. No server uploads, no logging.
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  • Real-time Formatting — See results instantly as you type with 100ms debounce.
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  • Large File Support — Automatically switches to button mode for files over 50KB to protect performance.
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  • Error Detection — Get helpful error messages when your JSON is invalid.
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How to use
 
     
  1. Paste your JSON data into the input field above.
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  2. The formatted result appears instantly in the output area.
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  3. Use the indent selector to choose 2 or 4 space indentation.
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  4. Click "Copy Result" to copy the formatted JSON to your clipboard.
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FAQ
 
 
 
Is my JSON data sent to any server?
 
No. All processing happens entirely in your browser using JavaScript. Your data never leaves your device.
 
 
 
What's the maximum JSON size I can format?
 
There's no hard limit, but for inputs over 50KB, the tool automatically switches to button mode to prevent browser slowdown.
 
 
 
Does this work offline?
 
Yes! Once the page loads, it works completely offline thanks to service worker caching.