Currently we don’t have any service (OTTB) for JSON validation. However you can make use of pub.schema:validate, create an IS document from JSON file and use pub.schema:validate to pass the IData to validate it.
Moreover there are public JSON services (pub.json:*) in WmPublic you can make use of them and build own custom logic to validate JSON.
You can raise a Feature Request in SoftwareAG Brainstorm in Empower to request for JSON validation service. Share the request number I can add my vote.
Could you please suggest me How to create JSON Schema in webMethods(Like we create Schema for Flatfile and XML).
How to validate JSON using the service “pub.schema:validate” , But what are the values should I give in the field “conformsTo” and “SchemaDomain” field.