JSON Formatter & Validator

{ }
JSON Formatter
Input
Paste JSON or click Load sample
Indent:
Output

Privacy-first JSON formatter

ser-json helps you format, validate, and convert JSON right in your browser. Paste JSON into the input panel and instantly beautify or minify it to make it readable (or compact) for debugging, logs, and API work.

This tool is privacy-first: your data stays on your device. No JSON is uploaded, stored, or sent to any server — everything runs locally in the browser.

You can also sort keys for consistent output and convert JSON to YAML, XML, or CSV when you need a different format.

FAQ

Is my JSON uploaded to a server?

No. ser-json runs entirely in your browser, so your JSON is not sent to any server.

Can I convert JSON to YAML?

Yes — use the Convert actions to generate YAML output.

Can I convert JSON to XML or CSV?

Yes. ser-json can convert JSON to XML and CSV directly in the app.

Does ser-json validate JSON?

Yes. It validates JSON and shows errors as you type or paste.

Does it support large JSON files?

Yes. Everything runs locally in your browser; performance depends on your device and browser.