Kafka Message Decoder
Turn Avro-encoded Kafka messages (base64 or hex) into readable JSON, with full wire-format inspection.
✓ Free ✓ No sign-up ✓ Runs in your browser
Kafka Message Decoder: loading the in-browser tool…
No warranty. Unless required by applicable law, this tool is provided on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. You are solely responsible for determining the appropriateness of using it and assume any risks associated with doing so.
How it works
Encoding and Confluent Schema-Registry framing are detected automatically: paste a message and a schema, get readable JSON.
Paste the encoded message
Drop in a base64 or hex Kafka message. We auto-detect the encoding and any Confluent Schema-Registry framing on the payload.
Provide the AVSC schema
Add the writer schema so we can decode the Avro payload. The wire-format box surfaces the magic byte, schema id and payload size.
Read the decoded JSON
The full record is rendered as readable JSON, so you can inspect exactly what is sitting on the topic.
Your data stays put. Your encoded messages and schema are decoded entirely in your browser. Nothing is uploaded, logged, or sent to any server.
Debugging Kafka topics all day?
TypedFlows gives you live, schema-aware visibility into every message flowing through your pipelines.
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