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Hello Vinita Gaonkar,
How to perform JSON validation depends on what service you are interested in (MPGW, APIGW, or some other service). Here is the documentation for MPGW JSON validation: https://www.ibm.com/docs/en/datapower-gateway/10.0.x?topic=actions-adding-validate-action. If you know what use case or service you are interested, it would narrow down how you can perform the json validation.