Free · in your browser
JSON Formatter
Pretty-print, validate and minify JSON instantly — with clear error messages. Free, fast and private: your data never leaves your device.
Private by design — your JSON is parsed locally and never uploaded.
How to format JSON online
- Paste your JSON into the box above.
- Pick your indentation (2 spaces, 4 spaces, or tab) and click Format / Beautify.
- Use Minify to strip whitespace, or Copy to grab the result.
Why use a JSON formatter?
Minified or hand-edited JSON is hard to read and easy to break. A formatter re-indents it consistently so structure is obvious, while the validator catches missing commas, unquoted keys, and trailing characters before they cause bugs in your API or config. Everything runs in your browser, so even sensitive payloads stay on your machine.
Frequently asked questions
Is this JSON formatter free and private?
Yes — it is 100% free with no sign-up, and completely private. Your JSON is parsed and formatted in your browser with the native JSON engine; nothing is ever uploaded to a server.
What does formatting (beautifying) JSON do?
It re-indents your JSON with consistent spacing and line breaks so it is easy to read and diff. You choose 2 spaces, 4 spaces, or tab indentation.
How does validation work?
As you type or paste, the tool parses your JSON. If it is invalid, you get a clear error message with the position of the problem so you can fix it fast.
Can it minify JSON?
Yes. The Minify button strips all whitespace to produce the smallest valid JSON, ideal for sending over the wire or embedding in code.