How to Broadcast Todoist Task Completions to Slack with Pipedream

pipedream.com > Workflows > New Workflow

Create a new Pipedream Workflow

Go to pipedream.com and sign in. Click 'Workflows' in the left sidebar, then click the blue 'New Workflow' button in the top right. You'll land on a blank canvas with a trigger slot at the top labeled 'Add a trigger'. This is where the Todoist connection starts.

1. 1Log into pipedream.com
2. 2Click 'Workflows' in the left sidebar
3. 3Click the blue 'New Workflow' button
4. 4Click the '+ Add Trigger' block at the top of the canvas

Trigger Panel > Search 'Todoist' > New Completed Task

Add the Todoist 'Task Completed' trigger

In the trigger search panel, type 'Todoist' and select it from the app list. Pipedream will show available trigger types. Select 'New Completed Task' — this fires via Todoist's webhook API every time a task is marked done. You will not need to poll on a schedule; Todoist pushes the event to Pipedream instantly.

1. 1Type 'Todoist' into the trigger search bar
2. 2Click the Todoist app icon
3. 3Select 'New Completed Task' from the trigger list
4. 4Click 'Connect a new Todoist account' if no account is linked yet

Trigger Config > Connect Account > Todoist OAuth

Authenticate your Todoist account

Click 'Connect a new Todoist account'. Pipedream opens an OAuth popup directing you to Todoist's authorization page. Log in with your Todoist credentials and click 'Agree' to grant Pipedream read access to your tasks and projects. Once authorized, the popup closes and Pipedream stores the token under Connected Accounts.

1. 1Click 'Connect a new Todoist account'
2. 2Log into Todoist in the OAuth popup
3. 3Click 'Agree' on the permissions screen
4. 4Wait for the popup to close and return to Pipedream

Trigger Config > Project dropdown

Filter to a specific Todoist project (optional but recommended)

By default the trigger fires on every completed task across all projects. In the trigger config panel, find the 'Project' dropdown and select the specific project you want to broadcast — for example, 'Q3 Sprint' or 'Product Roadmap'. If you leave it blank, every personal and shared task completion will post to Slack, which gets noisy fast.

1. 1Click the 'Project' dropdown in the trigger configuration panel
2. 2Select your target project from the list
3. 3Leave 'Section' and 'Label' filters blank unless you need finer control
4. 4Click 'Save and continue'

Trigger Config > Test Trigger button

Test the trigger to capture a real task event

Click 'Test Trigger' in Pipedream. Then go to Todoist, open the project you filtered to, and check off any task. Return to Pipedream within 30 seconds — the panel should show a live event payload including task content, project ID, completer's user ID, and completion timestamp. This payload is what all downstream steps will reference.

1. 1Click 'Test Trigger' in Pipedream
2. 2Switch to Todoist and mark any task complete in the filtered project
3. 3Return to Pipedream and wait for the event to appear
4. 4Click the event payload to expand and inspect the fields

Workflow Canvas > + Add Step > Run Node.js code

Add a Node.js code step to format the Slack message

Click the '+ Add Step' button below the trigger. Select 'Run Node.js code'. This step will take the raw Todoist payload and build a clean, readable Slack message. Using a code step here gives you full control over the message format — emojis, task name, project name, and completer's display name — rather than relying on Slack's limited block kit UI inside a pre-built action.

1. 1Click '+ Add Step' below the trigger block
2. 2Click 'Run Node.js code' from the step type list
3. 3Paste your formatting code into the editor (see Pro Tip below)
4. 4Click 'Test' to run the step against your trigger payload

Paste this into a Node.js code step placed between the Todoist trigger and the Slack action. It resolves the project name and formats a clean Slack message with an optional link back to the task. Replace the userMap object with your actual Todoist user IDs and names, which you can find in Todoist's web app under Settings > Integrations.

import axios from 'axios';
export default defineComponent({
  async run({ steps, $ }) {

import axios from 'axios';

export default defineComponent({
  async run({ steps, $ }) {
    const event = steps.trigger.event;

    // Resolve project name via Todoist REST API
    const projectRes = await axios.get(
      `https://api.todoist.com/rest/v2/projects/${event.project_id}`,
      {
        headers: {
          Authorization: `Bearer ${process.env.TODOIST_API_TOKEN}`,
        },
      }
    );
    const projectName = projectRes.data?.name ?? 'Unknown Project';

    // Hardcoded user ID → display name map
    // Get your user IDs from Todoist Settings > Integrations > API token, then GET /rest/v2/collaborators
    const userMap = {
      '40291847': 'Sarah Chen',
      '40291901': 'Marcus Rivera',
    };
    const completedBy = userMap[event.user_id] ?? `User ${event.user_id}`;

    // Format the completion timestamp to readable local time
    const completedAt = new Date(event.completed_at).toLocaleTimeString('en-US', {
      hour: 'numeric',
      minute: '2-digit',
      hour12: true,
      timeZone: 'America/New_York', // Change to your team's timezone
    });

    // Build Slack message text
    const taskUrl = `https://app.todoist.com/app/task/${event.id}`;
    const slackMessage = [
      `✅ *<${taskUrl}|${event.content}>*`,
      `Completed by *${completedBy}* at ${completedAt}`,
      `Project: *${projectName}*`,
    ].join(' · ');

    return { slackMessage, projectName, completedBy };
  },
});

Workflow Canvas > + Add Step > Slack > Send Message to Channel

Add a Slack 'Send Message' step

Click '+ Add Step' again and search for 'Slack'. Select the Slack app, then choose the 'Send Message to Channel' action. Connect your Slack account via OAuth when prompted. In the 'Channel' field, type or select the target channel (e.g., #product-wins). In the 'Message Text' field, reference the output of your code step using the Pipedream expression syntax.

1. 1Click '+ Add Step' below your code step
2. 2Search for 'Slack' and click the app
3. 3Select 'Send Message to Channel'
4. 4Click 'Connect a new Slack account' and authorize via OAuth
5. 5Set the Channel field to your target channel (e.g. #product-wins)
6. 6In the Message Text field, click the expression icon and reference steps.code.$return_value.slackMessage

Workflow Canvas > Test Workflow button (top right)

Test the full workflow end-to-end

Click 'Test Workflow' at the top of the canvas. Pipedream reruns the trigger payload from Step 5 through every step. Watch each step turn green as it executes. Then open your Slack channel — the message should appear within a few seconds. Check that the task name, project, and timestamp are formatted correctly.

1. 1Click 'Test Workflow' in the top toolbar
2. 2Watch each step indicator — green means success, red means error
3. 3Open your Slack channel to verify the message posted
4. 4Inspect the step outputs panel for any field mapping issues

Slack Step > Error Handling tab

Add error handling with a fallback notification

Click the Slack step block, then click the 'Error Handling' tab in the right panel. Enable 'Continue on error' and add a second Slack step that posts to a #alerts or DM channel if the main step fails. This ensures you know immediately if the Slack API rejects the message — rather than discovering it hours later when stakeholders wonder why the channel went quiet.

1. 1Click the Slack 'Send Message' step block
2. 2Click the 'Error Handling' tab in the right config panel
3. 3Toggle 'Continue on error' to ON
4. 4Click '+ Add Step' in the error branch
5. 5Add another Slack 'Send Message' action pointing to a #dev-alerts channel

Workflow Canvas > Deploy button (top right)

Deploy the workflow

Click the blue 'Deploy' button in the top right of the canvas. Pipedream activates the webhook and the workflow moves from Draft to Active status. From this point, every completed task in your filtered Todoist project will trigger a live Slack message — no manual runs required. You can monitor all executions in the 'Event History' tab.

1. 1Click the blue 'Deploy' button in the top right
2. 2Confirm the deployment dialog if prompted
3. 3Wait for the status badge to change from 'Draft' to 'Active'
4. 4Go to Todoist and complete a real task to confirm the live workflow fires