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JSON Formatter & Validator
Paste any JSON and format it with 2-space, 4-space or tab indentation, or minify it down to a single line. Invalid JSON is caught immediately with the exact parser error, so it doubles as a validator and linter. Everything runs client-side — your data never leaves your machine.
Input JSON
Result
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
Is my JSON uploaded to a server?＋
No. All parsing and formatting happens locally in your browser using JavaScript's native JSON engine. Nothing is transmitted or stored.
Can it validate JSON?＋
Yes — if the input is invalid, you'll see the exact syntax error (including position) instead of formatted output.
What indentation options are supported?＋
2 spaces, 4 spaces, or tabs for beautifying, plus a one-line minify mode.