JSON Formatter & Validator — Free Online Tool

What is a JSON Formatter?

A JSON formatter (also called a JSON beautifier or JSON pretty printer) is a tool that transforms minified or poorly structured JSON data into a clean, human-readable format with proper indentation. JSONFormatter.site is a free, browser-based JSON formatter that also validates JSON syntax, detects errors, and converts JSON to other formats — all without sending data to any server.

JSONFormatter.site is a free JSON formatter online that works directly in your browser. Whether you need to format JSON, validate JSON syntax, beautify minified API responses, or fix broken JSON — this tool handles it all without sending your data to any server. It works as a JSON beautifier, JSON linter, JSON cleaner, and JSON minifier in one place.

JSON Validator Online

Our online JSON validator checks your JSON syntax in real-time, identifying errors instantly with precise line numbers and clear error messages. Validation happens entirely in your browser for maximum speed and privacy.

Why use a JSON validator? Invalid JSON breaks applications and APIs. Validating JSON before use prevents runtime errors, failed API calls, and data corruption. Our validator catches syntax errors like missing commas, unquoted strings, and malformed arrays. Learn how to format JSON online in our complete guide.

Features of this JSON Tool

JSONFormatter.site vs Alternatives

How to Format JSON Online

How to format JSON? Follow these simple steps. Read our full guide on how to format JSON for advanced tips.

1. 1
   Paste your JSON — Copy your JSON data and paste it into the input panel on the left, or upload a file / load from URL.
2. 2
   Click Format — Press the Format button to beautify your JSON with proper indentation. Use Minify to compress it instead.
3. 3
   Copy the result — Click the copy button to copy the formatted JSON to your clipboard, or download it as a file.

Frequently Asked Questions about JSON Formatting

See our complete JSON formatter FAQ for more questions and answers.

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Example JSON

Here's an example of properly formatted JSON structure that demonstrates objects, arrays, and data types:

{
  "user": {
    "id": 12345,
    "name": "John Doe",
    "email": "john@example.com",
    "isActive": true
  },
  "orders": [
    {
      "orderId": "ORD-001",
      "total": 99.99,
      "items": ["Widget", "Gadget"]
    }
  ],
  "metadata": null
}