★ Free Developer Tool
JSON Formatter & Validator
Format, validate and minify JSON, with clear error messages.
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Runs entirely in your browser. Your files and text are never uploaded to our server.
About this toolJSON Formatter makes JSON readable with indentation, checks that it is valid, points to the line of any error, and can minify it again.
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- 100% free
- No sign-up
- Private
JSON Formatter makes JSON readable with indentation, checks that it is valid, points to the line of any error, and can minify it again.
More about JSON Formatter & ValidatorHow to use, good to know & FAQ
How to use JSON Formatter & Validator
- Paste your JSON.
- Click "Format", "Minify" or "Validate".
- Copy or download the result.
Frequently asked questions
Is my data sent anywhere?
No. Parsing happens in your browser, so API keys or private data in the JSON stay on your device.
What are common JSON errors?
Trailing commas, single quotes and unquoted keys are the most common causes of invalid JSON.
Is my JSON sent to a server?
No. Formatting and validation run locally in your browser.
When to use JSON Formatter & Validator
- Read messy API responses
- Find syntax errors in config files
- Minify JSON for production
- Share readable JSON with teammates
📘 Read the guide: JSON Formatting & Validation: A Beginner’s Guide With Examples