JSON Formatter & Validator

Prettify, minify, and validate your JSON data. Essential utility for developers.

How This Tool Works
100% Client-Side

Your data never leaves your device. All processing happens locally in your browser. No text is sent to any server, no data is stored, and no cookies track your usage.

JSON is parsed using the browser's native JSON.parse() function for validation. Formatting uses JSON.stringify() with configurable indentation (2 spaces for pretty, 0 for minified).

  • Validates JSON syntax and reports specific parsing errors
  • Uses native browser APIs - no external libraries needed
  • Handles nested objects and arrays of any depth
How to verify this yourself

Check your browser's Network tab to see nothing is sent:

  1. Open DevTools: Right-click anywhere on the page → "Inspect" (or press F12)
  2. Go to Network tab: Click "Network" at the top of the DevTools panel
  3. Use the tool: Type or paste text and watch the Network tab
  4. Verify: You'll see no requests to external servers — all processing is local

Works in Chrome, Firefox, Safari, and Edge.

About JSON

JSON (JavaScript Object Notation) is a lightweight data-interchange format. This tool helps you validate and format JSON strings to make them readable.