JSON Formatter & Validator
Free JSON formatter, validator and beautifier. Pretty-print or minify JSON with syntax checking and clear error messages. Runs locally — your data stays private.
JSON formatter, validator & minifier
Paste raw or messy JSON to instantly beautify it with clean indentation, or minify it to a single compact line. Invalid JSON produces a precise error so you can locate the problem. Ideal for debugging API responses and config files.
Frequently asked questions
Does this validate JSON?
Yes. If your JSON is invalid, you'll get a clear error message describing the problem so you can fix it. Valid JSON is reformatted instantly.
What's the difference between beautify and minify?
Beautify adds indentation and line breaks so JSON is easy to read. Minify removes all unnecessary whitespace to make the smallest possible output for transport.
Is my JSON sent to a server?
No. Parsing and formatting use your browser's built-in JSON engine. Your data never leaves your device, which is safe for sensitive payloads.