Free Online JSON Formatter & Validator
Format, validate, and minify JSON data instantly in your browser. Paste or type JSON to see it beautifully formatted with syntax highlighting, or minify it for production. Detects and highlights errors with line numbers. 100% private — nothing is uploaded or stored.
0 characters 1 line
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Frequently Asked Questions
Yes — all processing happens in your browser. Nothing is sent to any server.
It highlights the exact error location with a descriptive message so you can fix it quickly, but it doesn't auto-correct.
Format adds indentation and line breaks for readability. Minify removes all whitespace to reduce size for production use.
No hard limit — it depends on your browser's available memory. Works well with files up to several MB.