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Slack Post Message

n8n-nodes-base.httpRequest

Send a message to a Slack channel or user via the chat.postMessage API. Supports rich formatting, blocks, and attachments.

slack message chat post communication
App Slack
Category api integration
Version 1.0.0
Author Community
Credentials Slack OAuth2 API

💡 Use Cases

📚 API Documentation

Reference documentation for this API endpoint:

🔗 https://api.slack.com/methods/chat.postMessage ↗

📋 Node Configuration

{
  "nodes": [
    {
      "parameters": {
        "content": "## 💬 Slack Post Message\n\n**Usage:**\nSend a message to a Slack channel or direct message using the chat.postMessage API.\n\n**Required Input:**\n- `channel`: Channel ID (C1234567890) or user ID (U1234567890)\n- `text`: Message text (supports markdown)\n\n**Optional Fields:**\n- `blocks`: Block Kit JSON for rich layouts\n- `thread_ts`: Reply to a thread\n- `unfurl_links`: Unfurl links in message\n\n**Setup:**\n1. Configure Slack OAuth2 credentials with `chat:write` scope\n2. Pass channel ID and message text\n3. Optionally add blocks for rich formatting\n\n**Output:**\nReturns message timestamp (ts), channel, and message details",
        "height": 238,
        "width": 389,
        "color": 4
      },
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        96,
        332
      ],
      "typeVersion": 1,
      "id": "sticky-slack-post-message-001",
      "name": "Sticky Note"
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://slack.com/api/chat.postMessage",
        "authentication": "genericCredentialType",
        "genericAuthType": "oAuth2Api",
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ]
        },
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={\n  \"channel\": \"{{ $json.channel }}\",\n  \"text\": \"{{ $json.text }}\",\n  \"unfurl_links\": true,\n  \"unfurl_media\": true\n}",
        "options": {}
      },
      "id": "slack-post-message-001",
      "name": "Slack Post Message",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.1,
      "position": [
        368,
        400
      ],
      "credentials": {
        "oAuth2Api": {
          "id": "SlackOAuth2",
          "name": "Slack OAuth2"
        }
      }
    }
  ],
  "connections": {},
  "pinData": {},
  "meta": {
    "templateCredsSetupCompleted": true,
    "instanceId": "88a4b441e9a4af333af67be3c0ab8888b79ffa2aca1a09ed7a885e93b689b75f"
  }
}
[
  {
    "id": "8633aa69-f9e0-4e5e-befe-e798571a5313",
    "meta": {
      "name": "API Call Node",
      "id": "api-call",
      "icon": {
        "svg": "",
        "type": "SVG"
      },
      "description": "## 💬 Slack Post Message  **Usage:**"
    },
    "label": "Slack Post Message",
    "dependencies": {
      "node-fetch": "3.3.2"
    },
    "script": "import fetch from \"node-fetch\";\nexport default async function apiCall({\n    url,\n    method,\n    contentType,\n    authorization,\n    body,\n    shouldAwait,\n    queryParams,\n    customHeaders\n}: NodeInputs, {\n    logging\n}: NodeScriptOptions) : NodeOutput  {\n    const headers = {\n        \"Content-Type\": contentType,\n        ...customHeaders\n    };\n    if (authorization) headers[\"Authorization\"] = authorization;\n\n    let queryParamsString = '';\n    if (queryParams) {\n        queryParamsString = '?' + new URLSearchParams(queryParams).toString();\n    }\n\n    const fetchOptions = {\n        method,\n        headers\n    };\n\n    if (method !== 'GET') {\n        fetchOptions.body = JSON.stringify(body);\n    }\n\n    const fetchPromise = fetch(url + queryParamsString, fetchOptions);\n\n    if (!shouldAwait) {\n        return {\n            data: null\n        };\n    }\n\n    const response = await fetchPromise;\n    const data = await response.json();\n    return {\n        status: response.status,\n        data\n    };\n}",
    "inputs": {
      "properties": {
        "method": {
          "type": "string",
          "description": "The HTTP method to use for the API call",
          "enum": [
            "GET",
            "POST",
            "PUT",
            "DELETE",
            "PATCH"
          ],
          "default": "POST",
          "title": "HTTP Method",
          "buildship": {
            "options": [
              {
                "label": "GET",
                "value": "GET"
              },
              {
                "value": "POST",
                "label": "POST"
              },
              {
                "value": "PUT",
                "label": "PUT"
              },
              {
                "label": "DELETE",
                "value": "DELETE"
              },
              {
                "label": "PATCH",
                "value": "PATCH"
              }
            ],
            "index": 0,
            "sensitive": false
          }
        },
        "url": {
          "description": "The URL of the API endpoint",
          "title": "URL",
          "type": "string",
          "buildship": {
            "index": 1
          }
        },
        "authorization": {
          "description": "The authorization header for the API call, if required (e.g., Bearer or Basic token)",
          "type": "string",
          "title": "Authorization",
          "buildship": {
            "sensitive": true,
            "index": 2
          }
        },
        "queryParams": {
          "default": {},
          "description": "The query parameters for the API call",
          "type": "object",
          "title": "Query Parameters",
          "buildship": {
            "index": 3,
            "sensitive": false
          }
        },
        "body": {
          "type": "object",
          "buildship": {
            "index": 4
          },
          "description": "The body to send with the API call",
          "title": "Body"
        },
        "contentType": {
          "enum": [
            "application/json",
            "application/x-www-form-urlencoded",
            "multipart/form-data",
            "text/plain"
          ],
          "description": "The content type of the API call",
          "title": "Content Type",
          "buildship": {
            "index": 5,
            "options": [
              {
                "label": "application/json",
                "value": "application/json"
              },
              {
                "value": "application/x-www-form-urlencoded",
                "label": "application/x-www-form-urlencoded"
              },
              {
                "label": "multipart/form-data",
                "value": "multipart/form-data"
              },
              {
                "label": "text/plain",
                "value": "text/plain"
              }
            ]
          },
          "type": "string"
        },
        "shouldAwait": {
          "description": "Whether to wait for the request to complete or not",
          "title": "Await?",
          "type": "boolean",
          "buildship": {
            "sensitive": false,
            "index": 6
          }
        },
        "customHeaders": {
          "type": "object",
          "description": "Additional custom headers for the API call",
          "title": "Custom Headers",
          "buildship": {
            "index": 7,
            "sensitive": false
          }
        }
      },
      "type": "object",
      "required": [
        "url",
        "shouldAwait",
        "method"
      ]
    },
    "integrations": [],
    "name": "API Call Node",
    "output": {
      "buildship": {},
      "properties": {
        "status": {
          "buildship": {
            "index": 0
          },
          "type": "number",
          "description": "The HTTP status of the API response",
          "title": "Status"
        },
        "data": {
          "buildship": {
            "index": 1
          },
          "title": "Data",
          "type": "object",
          "description": "The data object from the API response"
        }
      },
      "type": "object"
    },
    "isCollapsed": false,
    "type": "script",
    "values": {
      "method": "POST",
      "url": "https://slack.com/api/chat.postMessage",
      "authorization": {
        "_$expression_": "`Bearer ${(await getSecret(\"ANONYMIZED_SECRET\"))}`",
        "type": "javascript",
        "hasErrors": false
      },
      "queryParams": {},
      "body": {
        "_$expression_": "{\n  \"channel\": ctx?.[\"root\"]?.[\"inputs\"]?.[\"body\"].channel,\n  \"text\": ctx?.[\"root\"]?.[\"inputs\"]?.[\"body\"].text,\n  \"unfurl_links\": true,\n  \"unfurl_media\": true\n}",
        "type": "javascript",
        "hasErrors": false
      },
      "contentType": "application/json",
      "shouldAwait": true,
      "customHeaders": {
        "Content-Type": "application/json"
      }
    }
  }
]
{
  "subflows": [
    {
      "flow": [
        {
          "id": 780,
          "module": "http:ActionSendDataBasicAuth",
          "version": 3,
          "parameters": {
            "key": "ANONYMIZED_CREDENTIALS",
            "handleErrors": false,
            "useNewZLibDeCompress": true
          },
          "mapper": {
            "ca": "",
            "qs": [],
            "url": "https://slack.com/api/chat.postMessage",
            "data": "{\n  \"channel\": {{1.channel}},\n  \"text\": {{1.text}},\n  \"unfurl_links\": true,\n  \"unfurl_media\": true\n}",
            "gzip": true,
            "method": "post",
            "headers": [
              {
                "name": "Content-Type",
                "value": "application/json"
              },
              {
                "name": "Authorization",
                "value": "Bearer {{ANONYMIZED_TOKEN}}"
              }
            ],
            "timeout": "",
            "useMtls": false,
            "bodyType": "raw",
            "contentType": "application/json",
            "serializeUrl": false,
            "shareCookies": false,
            "parseResponse": true,
            "followRedirect": true,
            "useQuerystring": false,
            "followAllRedirects": false,
            "rejectUnauthorized": true
          },
          "metadata": {
            "designer": {
              "x": 300,
              "y": 300,
              "name": "Slack Post Message"
            },
            "restore": {
              "expect": {
                "qs": {
                  "mode": "chose",
                  "items": []
                },
                "method": {
                  "mode": "chose",
                  "label": "POST"
                },
                "headers": {
                  "mode": "chose",
                  "items": [
                    null,
                    null
                  ]
                },
                "bodyType": {
                  "label": "Raw"
                },
                "contentType": {
                  "label": "JSON (application/json)"
                }
              },
              "parameters": {
                "key": {
                  "label": "ANONYMIZED_CREDENTIALS"
                }
              }
            },
            "parameters": [
              {
                "name": "key",
                "type": "keychain:basicauth",
                "label": "Credentials",
                "required": true
              },
              {
                "name": "handleErrors",
                "type": "boolean",
                "label": "Evaluate all states as errors (except for 2xx and 3xx )",
                "required": true
              },
              {
                "name": "useNewZLibDeCompress",
                "type": "hidden"
              }
            ],
            "expect": [
              {
                "name": "url",
                "type": "url",
                "label": "URL",
                "required": true
              },
              {
                "name": "serializeUrl",
                "type": "boolean",
                "label": "Serialize URL",
                "required": true
              },
              {
                "name": "method",
                "type": "select",
                "label": "Method",
                "required": true,
                "validate": {
                  "enum": [
                    "get",
                    "head",
                    "post",
                    "put",
                    "patch",
                    "delete",
                    "options"
                  ]
                }
              },
              {
                "name": "headers",
                "spec": [
                  {
                    "name": "name",
                    "type": "text",
                    "label": "Name",
                    "required": true
                  },
                  {
                    "name": "value",
                    "type": "text",
                    "label": "Value"
                  }
                ],
                "type": "array",
                "label": "Headers"
              },
              {
                "name": "qs",
                "spec": [
                  {
                    "name": "name",
                    "type": "text",
                    "label": "Name",
                    "required": true
                  },
                  {
                    "name": "value",
                    "type": "text",
                    "label": "Value"
                  }
                ],
                "type": "array",
                "label": "Query String"
              },
              {
                "name": "bodyType",
                "type": "select",
                "label": "Body type",
                "validate": {
                  "enum": [
                    "raw",
                    "x_www_form_urlencoded",
                    "multipart_form_data"
                  ]
                }
              },
              {
                "name": "parseResponse",
                "type": "boolean",
                "label": "Parse response",
                "required": true
              },
              {
                "name": "contentType",
                "type": "select",
                "label": "Content type",
                "validate": {
                  "enum": [
                    "text/plain",
                    "application/json",
                    "application/xml",
                    "text/xml",
                    "text/html",
                    "custom"
                  ]
                }
              },
              {
                "name": "data",
                "type": "buffer",
                "label": "Request content"
              }
            ]
          }
        }
      ]
    }
  ],
  "metadata": {
    "version": 1
  }
}

🔗 Related Slack Nodes

👍 Slack Add Reaction
Add an emoji reaction to a message in Slack using the reactions.add API. Supports any standard or custom emoji.
➕ Slack Create Channel
Create a new public or private channel in Slack using the conversations.create API.
📜 Slack Get Channel History
Fetch message history from a Slack channel using the conversations.history API. Supports pagination and time-based filtering.
👤 Slack Get User Info
Retrieve detailed information about a Slack user using the users.info API. Returns profile, status, and timezone data.
📨 Slack Invite to Channel
Invite one or more users to a Slack channel using the conversations.invite API.
📋 Slack List Channels
List all channels in a Slack workspace using the conversations.list API. Supports filtering by channel type and pagination.
← Browse all nodes