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JSON Formatter - Free Online Tool

Paste minified or messy JSON and format it with consistent indentation (2 or 4 spaces). Useful for config files, API responses, and debugging.

Format JSON

How to Use This Tool

  1. Paste your JSON into the input box.
  2. Choose indentation: 2 or 4 spaces.
  3. Click Format to pretty-print the JSON.
  4. Copy the result or clear to start over.

Benefits of Using This Tool

  • Readable JSON for configs and API responses.
  • No signup; runs in your browser.
  • Free and private—nothing is sent to servers.

When to Use JSON Formatter

  • Format API responses for debugging.
  • Prepare config files for version control.
  • Make minified JSON human-readable.

Decision Guide

Best for

  • Reading nested API responses before writing transformation code.
  • Reviewing config changes in pull requests with readable diffs.
  • Cleaning JSON copied from logs or browser network tabs.

Avoid when

  • You need schema validation or business-rule validation beyond syntax.
  • Data contains sensitive production payloads you should not paste into a browser tool.

Example

Format minified API payload

Input

{"user":{"id":42,"name":"Rohan","roles":["admin","editor"]},"active":true}

Output

{
  "user": {
    "id": 42,
    "name": "Rohan",
    "roles": [
      "admin",
      "editor"
    ]
  },
  "active": true
}

Readable formatting makes nested fields easy to scan and debug.

Troubleshooting

Formatter shows a syntax error unexpectedly.

Check for trailing commas, unquoted keys, or single quotes. JSON requires double-quoted keys and strings.

Output is valid but too large to inspect.

Format first, then copy into your code editor and use folding/search to inspect specific branches.

FAQs

Is my JSON sent to a server?

No. Formatting runs entirely in your browser. Your data never leaves your device.

What if my JSON is invalid?

You will see the parser error message so you can fix the syntax.

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