JSON validator
Validate a JSON object, array, or value.
Check whether text is valid JSON.
About this tool
The JSON validator checks that your text follows JSON syntax and reports invalid input without running it. It accepts any valid JSON value, including objects and arrays. Use it before sending an API request, while editing a configuration file, or when a copied payload fails to parse. A valid result confirms the structure can be read as JSON, while an error points you back to the source text.