JSON Formatter — Beautify & Validate JSON Online
Format, minify and validate JSON instantly. Free, no signup required.
JSON (JavaScript Object Notation) is the standard data format used by web APIs, configuration files, and databases. Unformatted JSON returned by an API looks like a single line of dense text — difficult to read and debug. Formatting adds indentation and line breaks to make the structure immediately visible. Minifying removes all whitespace to reduce file size for transmission. This formatter also validates your JSON syntax and shows the exact line and position of any error — useful when debugging API responses or hand-written configuration files. All processing is done in your browser with no data sent to any server.
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Frequently Asked Questions
What does JSON formatting do?
Formatting adds proper indentation and line breaks to make compressed JSON readable. Minifying removes all whitespace to make JSON compact for transmission.
How do I validate my JSON?
Click the Validate button. If your JSON is valid you will see a green confirmation. If invalid, the error message shows the exact location of the syntax error.
Is there a size limit for JSON input?
No hard limit. Very large JSON files over 1MB may be slightly slow to format but will work correctly.
Can I format JSON with comments?
Standard JSON does not support comments. If your JSON contains comments it is not valid JSON and the formatter will show an error.
Is my JSON data sent to a server?
No. All formatting and validation happens in your browser. Your JSON data is never transmitted anywhere.