JSON formatter
Format, indent, minify and validate JSON. 100% client-side.
🔒 100% client-side — no data sent
Format, validate and minify your JSON online with clean indentation and syntax error detection, straight in your browser. This free JSON formatter runs 100% client-side, so your data is never sent to a server, which is ideal for sensitive JSON.
FAQ
How do I format JSON?
Paste your JSON into the tool and it is automatically indented and structured (beautified) to be readable. You can then copy the formatted result.
What is the difference between formatting and minifying JSON?
Formatting adds indentation and line breaks for readability, while minifying removes all unnecessary whitespace to shrink file size. Both produce valid, equivalent JSON.
How do I know if my JSON is valid?
The tool validates the syntax and flags any error (missing comma, misplaced quote, unclosed brace) with its location. JSON with no reported error is well-formed.
Is my JSON sent anywhere?
No, all formatting and validation happen in your browser. Your data stays private and never passes through any server.