JSON Formatter, Beautifier & Validator
Paste JSON to beautify, minify or validate it instantly.
How to use the JSON Formatter & Validator
- Paste your JSON into the box.
- Click Beautify to indent it, or Minify to compress it.
- Click Validate to check for errors.
- Copy the result.
What is JSON?
JSON (JavaScript Object Notation) is the most common format for APIs and configuration files. It is easy for machines to parse but hard to read when minified on one line.
Common JSON errors
- Trailing commas after the last item.
- Single quotes instead of double quotes.
- Unquoted keys.
- Comments (not allowed in standard JSON).
The validator uses the browser's built-in JSON.parse and reports the exact error message. Your JSON never leaves your device, so it's safe for API responses containing private data.
Frequently asked questions
Is my JSON uploaded?
No. Everything runs locally in your browser.
Can it handle large files?
Yes, several MB of JSON works fine in modern browsers.
Why does the tab option matter?
Some teams prefer tabs for indentation; choose what matches your codebase.
Last updated: 10 November 2026