Developer tool
JSON Formatter and Validator
Paste JSON to format it with indentation, minify it for transport, or catch parsing errors before sending data to an API.
When to use this JSON formatter
Use this page when API responses are minified, configuration files are hard to scan, or a payload needs a quick validity check before it is copied into an app, test case, webhook, or documentation page. The formatter uses your browser's JSON parser, so invalid commas, missing quotes, incomplete arrays, and mismatched braces are reported immediately.
Formatted JSON is easier to compare, review, and debug. Minified JSON is useful when you need a compact payload for logs, examples, or transport.
Practical examples
- Beautify a compressed API response before reading nested fields.
- Validate a JSON request body before sending it to an endpoint.
- Minify a configuration snippet after editing it in a readable format.
FAQ
Is the JSON uploaded?
No. Formatting, minifying, and validation run in your browser for this static version.
Can it repair invalid JSON?
It reports parse errors so you can fix the input, but it does not automatically rewrite broken JSON.
What JSON problems does it catch?
It catches syntax issues such as missing quotes, trailing commas, incomplete arrays, and mismatched braces.