JSON Validator
JSONValidate JSON syntax and get a precise, human-readable error with line and column.
Frequently asked
Is JSON Validator free to use?
Yes. JSON Validator is completely free, with no sign-up and no usage limits.
Does JSON Validator upload my data?
No. JSON Validator runs entirely in your browser — your input never leaves your device and nothing is stored on a server.
How does JSON Validator work?
Validate JSON syntax and get a precise, human-readable error with line and column.
Can I use JSON Validator offline?
Once the page has loaded it works without a network connection, because all processing happens locally in your browser.