Free Online JSON Formatter & Validator

Format, beautify, validate, and minify your JSON data instantly. 100% private and processed locally in your browser—no data is ever uploaded.

🔒 Local Processing: Your JSON is formatted directly in your browser. No files or text leave your device.

Input

Output

Size
0 B
Keys
0
Max Depth
0
Valid
-

How to Use the JSON Formatter

  1. Paste your raw or unformatted JSON data into the Input text area on the left.
  2. Select your preferred indentation (2 or 4 spaces) from the dropdown.
  3. Click Format to pretty print the JSON with syntax highlighting on the right.
  4. If you want to compress the data, click Minify to remove all whitespace.
  5. Check the stats below to see the size, number of keys, and nesting depth of your JSON object.
  6. Use the Copy or Download buttons to save your formatted JSON.

Frequently Asked Questions

How does this JSON Formatter preserve my privacy? ▼
Unlike other online formatters, this tool runs entirely in your local browser using client-side JavaScript. No data, files, or API payloads are sent to our servers, making it completely safe for debugging sensitive production JSON payloads.
Does it support JSON validation? ▼
Yes. The tool automatically validates your JSON syntax as you format or minify it. If there is a syntax error (such as a missing quote, bracket, or key), it highlights the validity status and shows the exact error message and line number to help you debug quickly.
What JSON auto-fix options are available? ▼
You can check the "Auto-Fix Errors" box to automatically repair common JSON syntax errors, such as removing JavaScript-style inline/block comments, striping trailing commas before closing brackets, converting single quotes to double quotes, and wrapping unquoted keys in double quotes.
Can I minify or compress my JSON? ▼
Yes. Click the "Minify" button to instantly compress your JSON by stripping all unnecessary spacing, tabs, and line breaks. This optimizes the payload size for API requests and network transfers.
How do I download the formatted JSON? ▼
Once formatted or minified, you can click "Copy" to save it to your clipboard, or click "Download" to save the output directly as a formatted.json file to your device.