Validate JSON instantly and find out exactly where it breaks when it does not parse. A single trailing comma, a missing quote or an unescaped character can invalidate an entire payload, and generic error messages rarely point to the right spot. This validator uses the browser native parser, tells you clearly whether the JSON is valid, and when it is not, it surfaces the parser message so you can zero in on the problem. When the input is valid, it also pretty-prints it so you can read the structure at a glance. Paste your JSON and click validate. All checking happens in your browser, so sensitive tokens and payloads never leave your machine.