JSON Formatter & Validator
Pretty-print, minify and validate JSON with clear error messages — entirely in your browser.
Runs in your browser — files never leave your device
Output
How it works
Paste JSON and format it with 2 or 4 spaces, or minify it to a single line.
Invalid JSON shows a clear error. Everything runs locally.
Frequently asked questions
- Is my JSON uploaded?
- No — parsing and formatting happen in your browser.
- What if my JSON is invalid?
- You’ll get the parser’s error message so you can find the problem.
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