Format, validate and minify JSON right in your browser. Paste your JSON below and tidy it up with one click — with clear error messages when something is wrong. Free, private and no sign-up needed.
How to Use
- Paste your JSON into the input box above.
- Click Format to pretty-print it, Minify to compress it to a single line, or Validate to check it without changing anything.
- If the JSON is invalid, a clear error message explains what went wrong. Use Copy Output to copy the result.
Key Features
- One-click formatting with clean, readable 2-space indentation.
- Minify mode — compress JSON to a compact single line for APIs and storage.
- Instant validation with plain-language error messages.
- Copy Output button for quick reuse in your code.
- 100% private — your JSON is processed in your browser and never sent to a server.
FAQs
Is this JSON formatter free?
Yes. It is completely free to use, with no sign-up and no limits on the size of JSON you format.
What happens if my JSON is invalid?
You get a clear red error message describing the problem, such as an unexpected token or a missing quote, and the output panel is left empty until the input is fixed.
Does minifying change my data?
No. Minify only removes unnecessary whitespace and line breaks — your keys, values and structure stay exactly the same.
Is my JSON sent to a server?
No. All parsing and formatting happens locally in your browser with JavaScript, so your data never leaves your device.