This API is used to create a topic or delete topics in batches.

POST /v2/{project_id}/instances/{instance_id}/topics

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Definition Project ID. For details about how to obtain it, see Obtaining a Project ID. Constraints N/A Range N/A Default Value N/A
instance_id	Yes	String	Definition Instance ID. You can call the API for querying all instances to obtain the instance ID. The instance ID is in the response body. Constraints N/A Range N/A Default Value N/A

**Table 2** Query Parameters
Parameter	Mandatory	Type	Description
action	No	String	Definition This parameter is used to delete topics in batches. If it is not set, a topic will be created. Constraints N/A Range delete: batch deletion Left blank: topic creation Default Value N/A

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
name	No	String	Definition Topic name. Constraints Enter 3 to 64 characters. Use only letters, digits, percent (%), vertical bars (\|), hyphens (-), and underscores (_). Mandatory for topic creation. Range N/A Default Value N/A
queue_num	No	Number	Total number of queues. The range is 1–50.
message_type	No	String	Message type (This parameter is mandatory only for RocketMQ 5.x instances). Options: NORMAL (normal messages) FIFO (ordered messages) DELAY (scheduled messages) TRANSACTION (transactional messages)
topics	No	Array of strings	Definition Topic list. This parameter is used when topics are deleted in batches. Constraints N/A Range N/A Default Value N/A

Status code: 200

**Table 4** Response body parameters
Parameter	Type	Description
id	String	Definition Topic name. Constraints N/A Range N/A Default Value N/A
job_id	String	Definition ID of the topic deletion task. Constraints N/A Range N/A Default Value N/A

Creating topics for a RocketMQ 5.x instance in batch

POST https://{endpoint}/v2/{project_id}/instances/{instance_id}/topics

{
  "name" : "topic-test"
}

Deleting topics of a RocketMQ 5.x instance in a batch

POST https://{endpoint}/v2/{project_id}/instances/{instance_id}/topics?action=delete

{
  "topics" : [ "topic01", "topic02" ]
}

Status code: 200

Topic created.

Successfully deleted topics in a batch

{
  "job_id" : "8abfa7b299f0497c0199f0dc0a9a092b"
}

Status Code	Description
200	Topic created.

Creating a Topic or Deleting Topics in Batches