JSON Formatter and Validator
Validate, format and minify JSON locally with clear error messages.
About JSON Formatter
Paste JSON to validate its syntax, format it with readable indentation or minify it for transport. Nothing is sent to a server.
Helpful context
Does the formatter change values?
No. Valid JSON is parsed and serialized again, preserving values while normalizing whitespace.
Can it identify invalid JSON?
Yes. It shows the browser parser error and keeps the original input available for correction.