How to use this tool
- Paste your JSON into the input.
- It is validated and formatted automatically.
- Copy the tidy output, or read the error if it is invalid.
What your result means
A green status means valid JSON, neatly indented; an error points to what is malformed and roughly where. Formatting only changes whitespace and layout — never your data’s values.
The data format that quietly runs the internet
Almost every app you use talks to its servers in JSON — a simple, human-readable way to structure data that beat heavier rivals through sheer simplicity. When an app breaks, malformed JSON is often the culprit.
A single missing comma or stray quote can crash an entire request. Formatting and validating here shows you exactly where it went wrong — all in your browser, so sensitive data stays private.
How it works
Paste JSON into the input and click Beautify to indent it neatly, or Minify to strip whitespace for compact transfer. The tool parses your JSON in the browser and reports the exact position of any syntax error, so nothing is ever uploaded.
Frequently asked questions
Why is my JSON invalid?＋
Common causes are trailing commas, single quotes instead of double quotes, or unquoted keys. The status message shows where parsing failed.
Is my data private?＋
Completely. All parsing and formatting happens locally in your browser — your JSON is never sent to a server.