POST /chat.postMessage

Send a message to a channel

Detail	Value
Operation ID	messaging.postMessage
Method	POST
Path	/chat.postMessage
Connector	Slack

Parameters

No parameters.

Request Body

Field	Type
channel	string
text	string
blocks	array

Using this endpoint in a workflow

1. Add an API Call node to your workflow.
2. Pick your Slack connection from the Connection dropdown.
3. In the Operation dropdown, select messaging.postMessage.
4. Fill in the parameter fields that appear. Use {{...}} to reference upstream values.

Required fields are marked — fill them or the call will fail at runtime.

What it returns

The API Call node writes the response to the workflow context:

{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}

Reference response fields downstream as {{nodeId.data.path}}. The exact response shape is documented on the upstream Slack API reference.