A JSON formatter turns messy or minified JSON into clean, indented, readable text, and validates it as you type so you instantly see whether the structure is correct and where any error is. Everything runs locally in your browser.
How to use it
- Paste or type your JSON into the input box.
- The formatted, indented result appears instantly.
- Use Minify to strip whitespace for production payloads.
- Use Copy to copy the result.
- Invalid JSON shows exactly what and where the problem is.
About JSON Formatter
JSON is the most common data-interchange format on the web. APIs return it, configs are written in it, logs are structured with it. But JSON in the wild is often minified into one unreadable line or hand-typed with trailing commas that break parsers. Formatting makes it readable so you can inspect a payload, debug a response, or review a config at a glance. Validating catches the small mistakes that cause cryptic runtime errors. Because this runs client-side, it is safe to paste sensitive payloads — nothing is sent to any server.
FAQ
Is my JSON uploaded anywhere?
No. All formatting and validation happens locally in your browser. Your data never leaves your device.
What is the difference between formatting and minifying?
Formatting adds indentation to make JSON readable. Minifying removes all whitespace to make the payload as small as possible for production.
Why is my JSON invalid?
Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or unbalanced brackets. The validator points to the first error.