Is my JSON sent to a server?

No — formatting and validation run entirely in your browser, so sensitive data stays local.

Will it tell me where the error is?

Yes — invalid JSON is flagged so you can find and fix the problem.

Yes — collapse formatted JSON back to a single compact line.

Is there a size limit?

No fixed limit; large payloads are handled in-browser.

JSON Formatter

Beautify, minify and inspect JSON.

100% private — runs in your browser, no upload

Loading tool…

Format, validate and inspect JSON in your browser — VuConvert pretty-prints messy JSON, flags syntax errors with the line, and can minify it back down, all without sending your data anywhere. Built for developers debugging API responses and config files.

How to json formatter

1.Paste your JSON into the box above.
2.It's validated and pretty-printed instantly.
3.Fix any flagged errors, or minify to one line.
4.Copy the formatted (or minified) output.

Frequently asked questions

Is my JSON sent to a server?: No — formatting and validation run entirely in your browser, so sensitive data stays local.
Will it tell me where the error is?: Yes — invalid JSON is flagged so you can find and fix the problem.
Can it minify too?: Yes — collapse formatted JSON back to a single compact line.
Is there a size limit?: No fixed limit; large payloads are handled in-browser.