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JSONForge

JSON Formatter, Validator & Diff Tool

Format, validate, compare, and explore JSON data. Tree view, diff mode, syntax highlighting. Free, private — runs entirely in your browser.

✓ Valid JSONLines: 28Chars: 435Keys: 29Depth: 3
Input
Output
{
  "name": "Infinity AI",
  "type": "Organization",
  "projects": [
    {
      "name": "Neuromantix",
      "modules": 102,
      "language": "Rust"
    },
    {
      "name": "Vitalis",
      "modules": 345,
      "language": "Rust"
    },
    {
      "name": "Void LLM",
      "params": "303M",
      "language": "Rust + CUDA"
    }
  ],
  "stats": {
    "totalLOC": 347000,
    "totalTests": 8206,
    "rustVsPython": "139x faster"
  },
  "url": "https://infinitytechstack.uk",
  "active": true
}

Why JSONForge?

Format & Beautify

Transform messy, minified JSON into beautifully indented, readable code. Configurable indentation with 2, 4, or 8 spaces.

Instant Validation

Get real-time validation with precise error messages showing exactly where the syntax error is. No guessing, no frustration.

Tree View Explorer

Navigate complex JSON structures with our visual tree view. See keys, types, and values at every nesting level at a glance.

JSON Diff Compare

Paste two JSON objects side-by-side and instantly see the differences highlighted. Perfect for API debugging and config comparisons.

100% Private

Zero server requests. All processing happens in your browser using native JSON.parse/stringify. Your data never leaves your machine.

Export & Share

Copy formatted JSON to clipboard or download as a .json file. Ready to use in your codebase, API, or configuration.

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