How to Send Trello Updates to Slack with Make

Dashboard > Create Scenario > Trello > Watch Cards

Create new Make scenario

Log into make.com and click the orange Create a new scenario button on your dashboard. Search for 'Trello' in the app browser and select it as your trigger app. Choose the 'Watch Cards' trigger module - this fires when cards move between lists or receive comments.

1. 1Click 'Create a new scenario' from your Make dashboard
2. 2Type 'Trello' in the search box and select it
3. 3Choose 'Watch Cards' from the trigger options
4. 4Click 'Create'

Trello Module > Connection > Add

Connect Trello account

Click 'Add' next to Connection and authorize Make to access your Trello account. You'll be redirected to Trello's authorization page. Click 'Allow' to grant permissions for reading board data and webhook creation. Make needs webhook permissions to receive real-time updates.

1. 1Click 'Add' next to the Connection dropdown
2. 2Enter a connection name like 'Trello Main'
3. 3Click 'Continue' to open Trello authorization
4. 4Click 'Allow' on Trello's permission screen

Trello Module > Board > List Selection

Select target board and lists

Choose the specific Trello board you want to monitor from the Board dropdown. Then select which lists trigger notifications - typically 'Done', 'Review', or 'Blocked' lists where status changes matter most. Leave blank to monitor all list movements on the board.

1. 1Select your target board from the Board dropdown
2. 2Click the Lists field to open the multi-select
3. 3Choose 2-3 key lists like 'Review' and 'Done'
4. 4Leave other fields at default values

Scenario Canvas > + > Slack > Send a Message

Add Slack message module

Click the plus icon after your Trello module to add a new step. Search for 'Slack' and select 'Send a Message' action. This module will post formatted updates to your chosen Slack channel whenever the Trello trigger fires.

1. 1Click the circular + button after the Trello module
2. 2Type 'Slack' in the app search box
3. 3Select 'Send a Message' from the actions list
4. 4Click 'OK' to add it to your scenario

📬 New entry: {{1.name}}
Email: {{1.email}}
Details: {{1.description}}

Slack Module > Connection > Add

Authorize Slack connection

Click 'Add' next to Connection in the Slack module. You'll authorize Make to post messages to your Slack workspace. Grant permissions for channels:write and chat:write. Make sure you're logged into the correct Slack workspace before authorizing - the connection ties to your current workspace.

1. 1Click 'Add' next to the Connection field
2. 2Name your connection 'Company Slack' or similar
3. 3Click 'Continue' to open Slack authorization
4. 4Click 'Allow' to grant Make posting permissions

Slack Module > Channel > Selection

Configure target channel

Select the Slack channel where you want project updates posted. Type the channel name (including #) or pick from the dropdown list. The dropdown shows all channels where the Make app has been added - invite @Make to private channels first if needed.

1. 1Click the Channel dropdown to see available options
2. 2Type '#project-updates' or your target channel name
3. 3Select the channel from the filtered results
4. 4Verify the channel name appears correctly

Slack Module > Text > Message Builder

Build message template with Trello data

Click in the Text field and create a formatted message using Trello data tokens. Insert dynamic fields like card name, list name, and member names by clicking the mapping icons. Build a template that gives stakeholders context: what changed, which card, and who was involved.

1. 1Click in the Text field to open the message editor
2. 2Type 'Card moved: ' then click the data picker icon
3. 3Select 'name' from the Trello card data
4. 4Add ' → ' then select 'list name' for the destination list

📬 New entry: {{1.name}}
Email: {{1.email}}
Details: {{1.description}}

Module Connection > Right-click > Set Filter

Add conditional filtering

Right-click the connection line between Trello and Slack modules to add a filter. Set conditions to only send notifications for specific actions - like cards moving to 'Done' or receiving comments from external members. This prevents notification spam from routine card updates.

1. 1Right-click the line connecting your modules
2. 2Select 'Set up a filter' from the context menu
3. 3Choose 'List name' from the condition dropdown
4. 4Set operator to 'Equal to' and enter 'Done'

Scenario Controls > Run Once

Test the webhook setup

Click 'Run once' to initialize the webhook connection with Trello. Then go to your Trello board and move a card to one of your monitored lists. Return to Make within 60 seconds to see if the trigger captured the card movement. The test validates both webhook creation and Slack posting.

1. 1Click the 'Run once' button at the bottom of the scenario
2. 2Wait for 'Waiting for webhook' status to appear
3. 3Move a test card in Trello to trigger the webhook
4. 4Return to Make to see the execution results

Scenario Controls > Toggle Switch > On

Enable automatic scheduling

Turn on the scenario by clicking the toggle switch at the bottom left. The webhook will now listen continuously for Trello changes and post updates to Slack in real-time. Set the scenario name to something descriptive like 'Trello→Slack Project Updates' for easy identification later.

1. 1Click the scenario name field and enter a descriptive title
2. 2Click the toggle switch to turn it 'On'
3. 3Verify the switch shows green 'ON' status
4. 4Click 'Save' to persist your scenario configuration

This formula formats card movements with emoji indicators and handles missing data gracefully. Paste it into your Slack message Text field to replace the basic template.

{{if(1.listBefore.name != 1.listAfter.name; 
  "📋 Card moved: " + 1.name + "\n" +
  "↗️ From: " + if(1.listBefore.name != ""; 1.listBefore.name; "Unknown") + "\n" +

{{if(1.listBefore.name != 1.listAfter.name; 
  "📋 Card moved: " + 1.name + "\n" +
  "↗️ From: " + if(1.listBefore.name != ""; 1.listBefore.name; "Unknown") + "\n" +
  "✅ To: " + 1.listAfter.name + "\n" +
  "🏷️ Board: " + 1.board.name + "\n" +
  if(length(1.members) > 0; 
    "👥 Assigned: " + join(map(1.members; "fullName"); ", ") + "\n"; 
    ""
  ) +
  if(1.due != ""; 
    "⏰ Due: " + formatDate(1.due; "MMM DD"); 
    ""
  );
  "💬 New comment on: " + 1.name + " (" + 1.listAfter.name + ")"
)}