Tool · /01
JSON Formatter & Validator
Paste JSON, get formatted, validated, and minified output instantly. Runs entirely in your browser.
Format, validate, and minify JSON without uploading anything to a server. Useful for debugging API responses, cleaning up config files, and inspecting deeply nested objects.
FAQ
Is my data sent to a server?
No. All parsing and formatting happens locally in your browser using the native JSON API.
What's the maximum JSON size?
Limited only by your browser's memory. We've successfully formatted JSON files over 50MB without issue on modern hardware.
Why is my JSON invalid?
The most common causes are trailing commas, single quotes instead of double quotes, and unquoted keys. Our validator highlights the line and column where parsing failed.
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