JSON Validator

Click "Validate" to check whether the JSON is well-formed, with a precise error description if it isn't.

Input code

Use cases

Checking an API response before further processing
Finding a missing comma or bracket in a large config
Quickly validating JSON before pasting it into code

FAQ

How is this different from the JSON Formatter?

Same underlying check (JSON.parse), just presented as a standalone tool focused specifically on validation.

What should I do if the JSON is invalid?

The error message points to roughly where the problem is — often a missing comma, a trailing comma in an array, or an unclosed bracket.

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