Confluent Kafka Connect Single Message Transforms (SMT) Overview (2026)

Official Confluent documentation for Kafka Connect Single Message Transforms.

Key facts surfaced (2026-05-19):

• SMTs modify records as they flow through Kafka Connect — after source connector production but before Kafka write, or after Kafka read before sink delivery.
• 25+ built-in transforms available.
• Key transforms: ExtractField (field extraction from structured data), ValueToKey (replace record key with value subset), ReplaceField (filter or rename fields), Cast (type conversion), TimestampConverter (format conversion), EventRouter (Debezium event routing).
• Use cases: schema normalization, field extraction/masking, timestamp conversion, record routing.
• No custom code required for common transformation patterns.
• Curriculum reference: route-server-side-events node (Module 14).