Format and validate JSON
This JSON formatter turns compact or messy JSON into clean, indented, readable output, and validates it at the same time. Paste your JSON and choose 2 spaces, 4 spaces, tabs, or minified. If the JSON is invalid, you get a clear message with the line and column of the problem so you can fix it fast. Everything runs in your browser, so you can safely paste internal or sensitive data.
Format, validate, or minify
- Beautify adds consistent indentation and line breaks so nested structures are easy to read.
- Validate checks that your JSON is well-formed and pinpoints the first syntax error by line and column.
- Minify strips all whitespace to make the payload as small as possible.
Frequently asked questions
How do I format JSON?
Paste your JSON, pick an indentation, and the formatted version appears on the right, ready to copy.
How do I know if my JSON is valid?
The tool shows a "Valid JSON" or "Invalid JSON" badge as you type, and prints the exact line and column of the first error when something is wrong.
Can it minify JSON too?
Yes. Choose the Minified option to strip every space and line break while keeping the data identical.
Is my JSON uploaded anywhere?
No. Formatting and validation happen entirely in your browser.