JSON Formatter & Validator
Paste messy JSON to pretty-print it with your chosen indentation, or minify it to a single line. Invalid JSON gets a clear error so you can fix it fast — and your data never leaves your browser.
To format JSON, paste it in, choose an indentation, and click Format to pretty-print it (or Minify to compact it) — validated instantly in your browser.
Zero Server Uploads
Files process in local RAM
Instant WASM Speed
No waiting queues or lags
Unlimited Batching
Convert files without limits
How to use JSON Formatter
- 1Paste your JSON into the input box.
- 2Pick an indentation: 2 spaces, 4 spaces, or tabs.
- 3Click Format to beautify, or Minify to compact it.
- 4Copy the result; invalid JSON shows a clear error to fix.
How it works
Paste your JSON and hit Format to indent it neatly, or Minify to strip whitespace for the smallest possible payload. Pick 2 spaces, 4 spaces or tabs to match your codebase.
If the JSON is invalid, you'll get a precise error message pointing at the problem instead of a silent failure.
Why format in the browser
API responses, config files and logs often contain sensitive data — tokens, personal details, internal endpoints. Formatting locally means none of that is ever sent to a third-party server.
Frequently Asked Questions
Does it validate my JSON?
Yes. If the input isn't valid JSON, formatting fails with an error message describing what went wrong, so you can locate and fix it.
What indentation can I choose?
Two spaces, four spaces, or tabs. Minify removes all optional whitespace for the smallest output.
Is my JSON uploaded?
No. Parsing and formatting run entirely in your browser — your data stays on your device.