About This Tool

JSON is everywhere — APIs, configuration files, structured data. But JSON errors can be hard to spot. This free JSON formatter validates your JSON, pretty-prints it for readability, minifies it for storage, and highlights syntax errors. Paste any JSON, and the formatter instantly shows you if it's valid. Copy the formatted output, download it, or use it to debug API responses right in your browser.

Common Uses

  • Validate and format API responses
  • Debug malformed JSON in configuration files
  • Minify JSON for deployment or storage
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JSON Formatter & Validator

Pretty-print, validate, sort keys, or minify any JSON. Your data never leaves your browser.

{
  "name": "justthink",
  "plans": [
    {
      "id": 1,
      "tier": "week",
      "price": 25000
    },
    {
      "id": 2,
      "tier": "project",
      "price": null
    }
  ],
  "active": true
}
16 lines204 bytes9 keys4 max depth

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Frequently Asked

What counts as valid JSON?
Valid JSON must follow strict syntax: quoted keys, proper commas, no trailing commas, and valid value types (strings, numbers, booleans, null, arrays, objects).
Can I minify JSON?
Yes. The formatter can both pretty-print (readable) and minify (compact) JSON. Choose "Minify" to reduce file size.
Is my JSON stored?
No. All formatting happens in your browser. Your JSON never leaves the page unless you explicitly download or copy.
Can I debug deeply nested JSON?
Yes. The formatter highlights which line has the error and shows the structure clearly so you can spot the issue.