> ## Documentation Index > Fetch the complete documentation index at: https://docs.blinkops.com/llms.txt > Use this file to discover all available pages before exploring further. # Publish Pub-Sub Message Add one or more messages to the topic. External Documentation To learn more, visit the [Pub-Sub documentation](https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.topics/publish). ## Parameters
| Parameter | Description | | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Messages | An array of the message objects to be published. The message needs to be Base64 encoded. For more information see [Pub/Sub Documentation](https://cloud.google.com/pubsub/docs/reference/rest/v1/PubsubMessage).
For example:
\[
  \{
    "data": "SGVsbG8gV29ybGQh"
  },
  \{
    "data": "SGVsbG8gQmVhdXRpZnVsIFdvcmxkIQ=="
  }
]
| | Project ID | The messages in the request will be published on a topic in this project. | | Topic | The messages in the request will be published on this topic. Can be obtained by using the `List Topics` action.
For example:
\{
  "topics": \[
    \{
      "name": "projects/test/topics/test-topic"
    }
  ]
}

In order to extract the topic name we need to take the last part of the name returned, in this case `test-topic`. |
## Example Output ```json theme={"dark"} { "messageIds": [ string ] } ``` ## Workflow Library Example [Publish Pub Sub Message and Send Results Via Email](https://library.blinkops.com/workflows/publish-pub-sub-message-and-send-results-via-email)
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