Matrix Coffee Chat Group Bot

The workflow JSON

Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →

{
  "id": "9",
  "name": "Coffee Bot (Matrix)",
  "nodes": [
    {
      "name": "Greetings",
      "type": "n8n-nodes-base.matrix",
      "position": [
        670,
        240
      ],
      "parameters": {
        "text": "\ud83d\udc4b Happy Monday Groups for this week's virtual coffee are:",
        "roomId": "Enter your Room ID"
      },
      "credentials": {
        "matrixApi": "<your credential>"
      },
      "typeVersion": 1
    },
    {
      "name": "Employees in coffee chat channel",
      "type": "n8n-nodes-base.matrix",
      "position": [
        880,
        240
      ],
      "parameters": {
        "roomId": "Enter your Room ID",
        "filters": {
          "membership": ""
        },
        "resource": "roomMember"
      },
      "credentials": {
        "matrixApi": "<your credential>"
      },
      "typeVersion": 1
    },
    {
      "name": "Weekly trigger on monday1",
      "type": "n8n-nodes-base.cron",
      "position": [
        480,
        240
      ],
      "parameters": {
        "triggerTimes": {
          "item": [
            {
              "hour": 10,
              "mode": "everyWeek"
            }
          ]
        }
      },
      "typeVersion": 1
    },
    {
      "name": "Divide into groups",
      "type": "n8n-nodes-base.function",
      "notes": "This still needs to be reconfigured to grab the information from the second Matrix node. Have an issue with the ",
      "position": [
        1090,
        240
      ],
      "parameters": {
        "functionCode": "const ideal_group_size = 3;\nlet groups = [];\nlet data_as_array = [];\nlet newItems = [];\n\n// Take all the users and add them to an array\nfor (let j = 0; j < items.length; j++) {\n  data_as_array.push({username: items[j].json.user_id});\n}\n\n// Fisher-Yates (aka Knuth) Shuffle\nfunction shuffle(array) {\n  var currentIndex = array.length, temporaryValue, randomIndex;\n\n  // While there remain elements to shuffle...\n  while (0 !== currentIndex) {\n\n    // Pick a remaining element...\n    randomIndex = Math.floor(Math.random() * currentIndex);\n    currentIndex -= 1;\n\n    // And swap it with the current element.\n    temporaryValue = array[currentIndex];\n    array[currentIndex] = array[randomIndex];\n    array[randomIndex] = temporaryValue;\n  }\n\n  return array;\n}\n\n// Randomize the sequence of names in the array\ndata_as_array = shuffle(data_as_array);\n\n// Create groups of ideal group size (3)\nfor (let i = 0; i < data_as_array.length; i += ideal_group_size) {\n  groups.push(data_as_array.slice(i, i + ideal_group_size));\n}\n\n// Make sure that no group has just one person. If it does, take\n// one from previous group and add it to that group \nfor (let k = 0; k < groups.length; k++) {\n  if (groups[k].length === 1) {\n    groups[k].push(groups[k-1].shift());\n  }\n}\n\nfor (let l = 0; l < groups.length; l++) {\n    newItems.push({json: {groupsUsername: groups[l].map(a=> a.username)}})\n}\n\nreturn newItems;\n"
      },
      "typeVersion": 1
    },
    {
      "name": "Announce groups",
      "type": "n8n-nodes-base.matrix",
      "position": [
        1290,
        240
      ],
      "parameters": {
        "text": "=\u2600\ufe0f {{$node[\"Divide into groups\"].json[\"groupsUsername\"].join(', ')}}",
        "roomId": "!hobuowPzLuKnojiyfV:matrix.org"
      },
      "credentials": {
        "matrixApi": "<your credential>"
      },
      "typeVersion": 1
    }
  ],
  "active": true,
  "settings": {},
  "connections": {
    "Greetings": {
      "main": [
        [
          {
            "node": "Employees in coffee chat channel",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Divide into groups": {
      "main": [
        [
          {
            "node": "Announce groups",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Weekly trigger on monday1": {
      "main": [
        [
          {
            "node": "Greetings",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Employees in coffee chat channel": {
      "main": [
        [
          {
            "node": "Divide into groups",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  }
}

Credentials you'll need

Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.

• matrixApi

About this workflow

Coffee Bot (Matrix). Uses matrix. Scheduled trigger; 5 nodes.

Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →

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