JSON Formatter & Validator
Paste raw or minified JSON to pretty-print with customizable indentation, validate syntax against RFC 8259, or minify payloads for production APIs. All parsing runs locally in your browser so sensitive API payloads stay private.
How to Use JSON Formatter & Validator
- 1Paste your raw JSON string into the input editor on the left.
- 2Choose an indentation level (2 spaces or 4 spaces) and click 'Format' to pretty-print, or 'Minify' to strip whitespace.
- 3If your JSON has a syntax error, check the validation banner for the error message and position.
- 4Click 'Copy' to copy the formatted or minified JSON to your clipboard.
Frequently Asked Questions
Is it safe to paste API responses or configuration files here?
Yes. Formatting and validation use your browser's native JSON.parse and JSON.stringify methods. No payload data is ever sent over the network.
Why do trailing commas or single quotes fail JSON validation?
The official JSON specification (RFC 8259) strictly requires double quotes around all keys and string values and forbids trailing commas after the last item in an object or array.
What is the difference between formatting and minifying JSON?
Formatting adds line breaks and indentation so humans can read nested objects easily. Minifying removes all non-essential whitespace and newlines to reduce payload size over HTTP.
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