How to Use 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.
Open the JSON Formatter & Validator tool →What is JSON Formatter & Validator?
Beautify, minify and validate JSON with configurable indentation — instantly, in your browser. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use JSON Formatter & Validator
- Open the JSON Formatter & Validator tool.
- Paste or type your input.
- Set any options provided.
- Copy the result. Everything runs in your browser — nothing is 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.
Ready to try it?
Open JSON Formatter & Validator →