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The Protobuf Client and the Protobuf Responder tools have a Payload Converted to XML output that allows the incoming message to be validated in XML format, typically with an XML Assertor tool or a Diff tool in XML mode. If you instead want to validate messages as ProtoJSON, first chain an XML Converter tool. In the XML Converter tool , set under Tool Options, set Format to Protobuf and Conversion direction to From XML to native and set Format to JSON. The The Message type can can be left blank because it will be inferred from the XML. A . Under Options, set Format to JSON. A JSON Assertor can then be chained to the XML Converter tool, for example.
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