Free JSON Formatter and Validator
Paste JSON to make it readable, shrink it to one line, or check whether it is valid. Errors point to where parsing failed.
Your data stays on your device.
Features
- Pretty-print with 2 spaces, 4 spaces or tabs
- Minify to a single line
- Validation with a clear error message
- Runs locally, safe for private payloads
How to use JSON Formatter
- Paste your JSON into the input box.
- Choose Format, Minify or Validate.
- Copy the result.
Frequently asked questions
Is it safe to paste private data?
The JSON is parsed in your browser and is not sent to any server.
Why is my JSON invalid?
Common causes are trailing commas, single quotes instead of double quotes, unquoted keys and comments. Standard JSON allows none of these.
Does formatting change my data?
No. Only whitespace changes. Keys stay in the same order and values are untouched.