JSON Validator Online
Validate JSON online with our free JSON Validator. Paste your JSON and instantly check whether it is well-formed, with a clear error message if not.
Your JSON is processed directly in your browser and is not uploaded to our servers.
What is a JSON Validator?
A JSON validator checks whether a piece of JSON text follows the JSON specification — matched brackets, correctly quoted keys, no trailing commas, valid value types. It doesn't just format the text; it tells you definitively whether it will parse successfully or point out exactly what's wrong.
Use this free JSON validation tool to check JSON syntax before sending it to an API, saving it to a config file, or debugging a response that's failing to parse. It runs the same JSON parser your browser and most languages use, so a pass here means real parsers will accept it too.
How to Validate JSON Online
Paste your JSON
Paste the JSON you want to check into the input field above.
Click Validate JSON
Click the Validate JSON button to run the check.
Read the result
See an instant pass/fail result, with the exact parser error if something is wrong.
Fix and re-check
Correct the issue and validate again until you get a clean pass.
JSON Validator Features
Valid vs Invalid JSON
{"name":"John","age":30}{"name":"John","age":30,}Why Use This JSON Validation Tool?
A single misplaced comma or unclosed bracket can silently break an API integration or a build pipeline. Validating JSON before it reaches production catches these issues in seconds instead of during a confusing runtime error, and doing it in-browser means no data ever leaves your machine.
Frequently Asked Questions
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