# Using the ScyllaDB CDC Kafka Connector, how can I add/customize Kafka message headers? Also is Avro supported? **URL:** \ **Category:** ScyllaDB\ **Tags:** cdc, kafka, avro\ **Created:** [January 11, 2026, 5:04am UTC](https://forum.scylladb.com/t/using-the-scylladb-cdc-kafka-connector-how-can-i-add-customize-kafka-message-headers-also-is-avro-supported/5239 "2026-01-11T05:04:07Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Guy](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.scylladb.com/guy/32/9_2.png) [@Guy](https://forum.scylladb.com/u/Guy)\ **Post date:** [January 11, 2026, 5:04am UTC](https://forum.scylladb.com/t/using-the-scylladb-cdc-kafka-connector-how-can-i-add-customize-kafka-message-headers-also-is-avro-supported/5239/1 "2026-01-11T05:04:07Z")
> [@](#): > > **[Originally from the User Slack](https://scylladb-users.slack.com/)** > > ![Dzung](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/2X/b/bcefeefbb9381728c041fc6793a80c713155c51d.png) **@Dzung:** Hey team 👋 > I have a couple of questions regarding the **ScyllaDB CDC Kafka Connector** (reading CDC logs and publishing to Kafka): > > 1. Is it possible to **add/customize Kafka message headers** (e.g. event type, version,)? > 2. Does the connector **support Avro serialization and Schema Registry** , or is JSON the only supported output format? > > ![Felipe_Cardeneti_Mendes](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/1X/233a9d524fbc97e39f08633c16b3dd2575d1d1f4.jpeg) @Felipe\_Cardeneti\_Mendes\*\*:\*\* You should be able to use a SMT to add custom headers. `InsertHeader` is one that comes to mind, though I never really tried it. > > Depending on what you are after, you may also check if the header you are after isn’t already provided by Debezium and can be enabled with its relevant connector properties. > And Avro works