Robin Moffatt • 7/3/2020

Why JSON isn't the same as JSON Schema in Kafka Connect converters and ksqlDB (Viewing Kafka messages bytes as hex)

This technical article details the differences between JSON and JSON Schema serializers in Kafka Connect and ksqlDB. It demonstrates using kafkacat and hexdump to examine the raw byte format, highlighting the five-byte header (magic byte and schema ID) present in JSON Schema messages but not in plain JSON. The author warns that the converters are not interchangeable due to this wire format difference, which can cause breakage if misused.

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#serialization #JSON Schema #Kafka Connect