JSON Formatter / Validator
Format, beautify, validate, and minify JSON in your browser with clear error messages. Free online JSON formatter — nothing is uploaded.
Format, validate, and minify JSON in one place. Paste raw JSON to beautify it with clean indentation, collapse it to a single line, or instantly find out whether it's valid — with a clear error message pointing at the problem. Everything is processed locally in your browser.
How to use JSON Formatter / Validator
- Paste your JSON into the input box.
- Click "Beautify" to indent it, or "Minify" to compress it.
- If it's invalid, read the error message, fix the issue, and try again.
Frequently asked questions
What does "Invalid JSON" mean?
It means the text doesn't follow JSON syntax — often a missing comma, an unquoted key, a trailing comma, or single quotes instead of double quotes. The message describes where parsing failed.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks so JSON is easy to read; minify strips all optional whitespace to make the smallest possible payload for transmission.
Is my JSON uploaded anywhere?
No. Parsing and formatting happen entirely in your browser, so sensitive data in your JSON stays on your device.
Does it validate against a schema?
It validates JSON syntax, not a specific schema. It confirms the structure is well-formed, but not whether fields match a particular specification.