RabbitMQ - Send a JSON message

Question

I send the following message with content type application/json:

However whene i get messages from the same RabbitMQ Web console, it shows the payload as String.

What am I doing wrong? Or am I fundamentally misunderstanding and the Payload is always of type String?

Answer 1

From the official docs:

AMQP messages also have a payload (the data that they carry), which AMQP brokers treat as an opaque byte array. The broker will not inspect or modify the payload. It is possible for messages to contain only attributes and no payload. It is common to use serialisation formats like JSON, Thrift, Protocol Buffers and MessagePack to serialize structured data in order to publish it as the message payload. AMQP peers typically use the "content-type" and "content-encoding" fields to communicate this information, but this is by convention only.

So basically, RabbitMQ has no knowledge on JSON, messages all are just byte arrays to it

Answer 2

from here

Content Type and Encoding

The content (MIME media) type and content encoding fields allow publishers communicate how message payload should be deserialized and decoded by consumers.

RabbitMQ does not validate or use these fields, it exists for applications and plugins to use and interpret.

by the way, using the rabbitMQ web gui, you use the words content_type, however in code (javascript confirmed), you use the key name contentType. it's a subtle difference, but enough to drive you crazy.