How to Broadcast Todoist Task Completions in Slack with Power Automate

make.powerautomate.com > My flows > + New flow > Automated cloud flow

Sign in and create a new Automated cloud flow

Go to make.powerautomate.com and sign in with your Microsoft 365 account. From the left sidebar, click 'My flows', then click '+ New flow' in the top-left corner. A dropdown appears — select 'Automated cloud flow'. In the dialog box, give your flow a name like 'Todoist Completion → Slack' and skip the trigger search for now by clicking 'Skip' at the bottom. You'll add the trigger manually in the next step.

1. 1Click 'My flows' in the left sidebar
2. 2Click '+ New flow' in the top-left
3. 3Select 'Automated cloud flow' from the dropdown
4. 4Name the flow 'Todoist Completion → Slack'
5. 5Click 'Skip' to dismiss the trigger picker dialog

Flow canvas > Add a trigger > Search: Todoist > When a task is completed

Add the Todoist 'Task completed' trigger

Click the 'Add a trigger' block on the canvas. A right-hand panel opens with a search bar. Type 'Todoist' and select the Todoist connector from the results. Scroll through the trigger list until you find 'When a task is completed' and click it. Power Automate will immediately ask you to authenticate your Todoist account.

1. 1Click the 'Add a trigger' placeholder block
2. 2Type 'Todoist' in the search bar on the right panel
3. 3Click the Todoist connector icon
4. 4Select 'When a task is completed' from the trigger list

Todoist trigger card > Sign in > Todoist OAuth pop-up

Authenticate your Todoist connection

Click 'Sign in' inside the trigger card. A pop-up browser window opens pointing to Todoist's OAuth page. Log in with the Todoist account that owns the projects you want to monitor. Click 'Agree' to grant Power Automate read access. The pop-up closes and Power Automate shows your email address next to a green checkmark inside the trigger card.

1. 1Click the 'Sign in' button inside the Todoist trigger card
2. 2Log in to Todoist in the pop-up window
3. 3Click 'Agree' on the Todoist permissions screen
4. 4Wait for the pop-up to close automatically

Todoist trigger card > Project dropdown

Configure the Todoist trigger filter

Inside the Todoist trigger card, you'll see a 'Project' dropdown. If you want the flow to fire for all projects, leave it set to 'All projects'. To target a specific project — say, your sprint board — click the dropdown and select the project name. There are no additional filter options in this connector for labels or assignees at the trigger level; you'll handle those with a condition in a later step.

1. 1Click the 'Project' dropdown inside the trigger card
2. 2Select a specific project or leave as 'All projects'
3. 3Click 'Save' in the top-right corner to preserve this setting

Flow canvas > + New step > Control > Condition

Add a Condition to filter out irrelevant completions

Click the '+ New step' button below the trigger card. Search for 'Condition' and select the built-in Control action. This step prevents noise — for example, you might only want to announce tasks from a specific project or tasks with a specific label. In the left condition field, click inside and select 'Project Name' from the dynamic content panel. Set the operator to 'contains' and type your target project name in the right field.

1. 1Click '+ New step' below the trigger card
2. 2Search for 'Condition' in the action picker
3. 3Select 'Condition' under the Control category
4. 4Click inside the left value field and pick 'Project Name' from dynamic content
5. 5Set operator to 'contains' and enter your project name in the right field

Condition > If yes > Add an action > Slack > Post message (V2) > Sign in

Authenticate your Slack connection

Inside the 'If yes' branch, click 'Add an action'. Search for 'Slack' in the action picker. Select the Slack connector, then choose 'Post message (V2)'. A 'Sign in' button appears — click it. An OAuth pop-up opens for Slack. Select your workspace from the dropdown, then click 'Allow'. Power Automate stores this as a reusable Slack connection.

1. 1Click 'Add an action' inside the 'If yes' branch
2. 2Search 'Slack' and click the Slack connector
3. 3Select 'Post message (V2)'
4. 4Click 'Sign in' in the action card
5. 5Select your Slack workspace and click 'Allow'

Post message (V2) card > Channel Name or ID > Message Text

Configure the Slack message content

Inside the 'Post message (V2)' card, click the 'Channel Name or ID' dropdown and select your target Slack channel — for example, #product-wins. In the 'Message Text' field, build your announcement using dynamic content from the Todoist trigger. Click inside the Message Text field, then use the dynamic content panel to insert fields. A good format: '✅ *[Task Content]* completed in *[Project Name]* by [Assignee Name]'. You can type static text and insert dynamic tokens inline.

1. 1Click 'Channel Name or ID' and select your Slack channel (e.g. #product-wins)
2. 2Click inside the 'Message Text' field
3. 3Type '✅ *' then insert 'Task Content' from dynamic content
4. 4Type '* completed in *' then insert 'Project Name'
5. 5Type '* — completed by ' then insert 'Assignee Name' if available

Flow canvas > between trigger and condition > + New step > Data Operations > Parse JSON

Add a Parse JSON step to extract nested Todoist data

The Todoist trigger returns a raw JSON body that sometimes includes nested objects like 'due' dates and 'labels' as arrays. To access these cleanly, click '+ New step' before your Condition step and add a 'Data Operations – Parse JSON' action. In the 'Content' field, insert the 'Body' token from the Todoist trigger. Paste the schema from the pro tip section below into the Schema field. This gives you clean dynamic tokens like 'due date' and 'label names' throughout the rest of the flow.

1. 1Click the '+' icon between the Todoist trigger and Condition cards
2. 2Search 'Parse JSON' and select 'Data Operations – Parse JSON'
3. 3Click the 'Content' field and insert the 'Body' token from the Todoist trigger
4. 4Paste the JSON schema into the 'Schema' field (see pro tip below)
5. 5Click 'Done'

Condition > If no > Add an action > Control > Terminate

Handle the 'If no' branch to avoid errors

Click inside the 'If no' branch of your Condition. Add a 'Terminate' action and set Status to 'Succeeded'. This tells Power Automate to end the run cleanly when a task doesn't match your filter, rather than letting the run show as failed or skipped. Without this, your run history fills with red failed runs that are actually just filtered-out tasks.

1. 1Click 'Add an action' inside the 'If no' branch
2. 2Search 'Terminate' and select it under Control
3. 3Set Status to 'Succeeded'
4. 4Leave the Comment field blank or add 'Task filtered out'

Flow canvas top bar > Save > Test > Manually

Test the flow with a real Todoist task

Click 'Save' in the top-right corner of the canvas. Then click 'Test' next to it and select 'Manually'. Power Automate will wait for a trigger event. Open Todoist in another browser tab and mark a task complete in your target project. Wait up to 5 minutes for the poll interval to fire. Return to Power Automate — the test panel should show the run executing. If the Condition passes, you'll see a green checkmark on the Slack action.

1. 1Click 'Save' in the top-right corner
2. 2Click 'Test' and select 'Manually'
3. 3Open Todoist and mark a task complete in your target project
4. 4Wait up to 5 minutes for the poll to fire
5. 5Return to Power Automate and check the run result

My flows > [Your flow name] > Run history

Turn the flow on and monitor run history

Click the back arrow to return to the flow detail page. The flow status should show 'On' by default after saving. Confirm by checking the toggle at the top of the flow detail page — it should read 'On'. For the first 48 hours, check 'Run history' on this page after a few completions to confirm the Slack messages look right and no runs are erroring. You can click any run to see each action's input and output.

1. 1Click the back arrow from the canvas to the flow detail page
2. 2Confirm the flow toggle reads 'On'
3. 3Complete 2-3 tasks in Todoist over the next hour
4. 4Return to the flow detail page and click 'Run history'
5. 5Click each run to verify the Slack message content is correct

Paste this expression into a 'Compose' action placed directly after the Parse JSON step. It builds the full Slack message string with priority emoji, null-safe assignee, and a formatted completion date — then you reference the Compose output in your Slack 'Message Text' field instead of building it inline.

// Power Automate — Compose action expression
// Paste into the 'Inputs' field of a Compose action
// Outputs a clean Slack message string

// Power Automate — Compose action expression
// Paste into the 'Inputs' field of a Compose action
// Outputs a clean Slack message string

concat(
  if(equals(body('Parse_JSON')?['priority'], 1), '🔴 ', 
    if(equals(body('Parse_JSON')?['priority'], 2), '🟠 ', '✅ ')
  ),
  '*', body('Parse_JSON')?['content'], '*',
  ' completed in *', body('Parse_JSON')?['project_name'], '*',
  ' — by ',
  if(
    empty(body('Parse_JSON')?['assignee_name']),
    'team',
    body('Parse_JSON')?['assignee_name']
  ),
  ' on ',
  formatDateTime(body('Parse_JSON')?['completed_at'], 'MMM d, h:mm tt')
)