JSON Formatter & Validator

What is JSON Formatter?

JSON Formatter is a free online tool that instantly formats and validates JSON data. Paste raw or minified JSON and click Format to produce human-readable output with proper indentation. Use Minify to compress JSON for APIs or storage.

How to use

1. Paste your JSON text into the input box.
2. Click Format to pretty-print with 2-space indentation, or Minify to remove all whitespace.
3. If there is a parse error, the status line shows the exact location.
4. Click Copy to copy the output to your clipboard.

Notes

• All processing happens in your browser. Your JSON is never sent to a server.
• JSON keys must be quoted with double quotes. Single quotes are not valid JSON.
• Trailing commas are not allowed in standard JSON.

FAQ

Can this tool validate JSON?

Yes. If the input is not valid JSON, the tool shows a parse error with the reason. A successful format means the JSON is syntactically valid.

What is the difference between Format and Minify?

Format adds indentation and line breaks to improve readability. Minify removes all unnecessary whitespace to reduce file size, which is useful for APIs and production builds.

Is there a size limit?

There is no hard limit. Performance depends on your browser and device. Very large JSON files (several MB) may be slow to process.