JSON Formatter & Validator
Prettify, format, and minify JSON code strings.
About This Tool
Paste raw, unformatted, or minified JSON and instantly get a readable, indented version — or go the other way and minify it for production use. The tool also validates the JSON and points out if it is malformed.
How to Use JSON Formatter & Validator
- Paste your JSON into the text box.
- Click "Prettify JSON" for readable indentation, or "Minify JSON" to compress it to one line.
- If the JSON is invalid, an error message appears instead.
Frequently Asked Questions
What happens if my JSON has a syntax error?
The tool will show an "Invalid JSON string" message rather than silently producing wrong output, so you know to check for issues like trailing commas or unquoted keys.
Is my JSON data sent to a server?
No, all formatting and validation happens locally in your browser using the native JSON parser.