How to Send Todoist Deadline Alerts to Slack with Power Automate

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

Create a new Scheduled cloud flow

Go to make.powerautomate.com and sign in with your Microsoft 365 account. Click 'My flows' in the left sidebar, then '+ New flow' at the top. Select 'Scheduled cloud flow' from the dropdown — this is the right type because Todoist doesn't push webhook events natively for deadline checks. Name the flow something like 'Todoist Deadline Alerts to Slack'.

1. 1Navigate to make.powerautomate.com
2. 2Click 'My flows' in the left sidebar
3. 3Click '+ New flow' near the top of the page
4. 4Select 'Scheduled cloud flow'
5. 5Enter a flow name and set the starting time and recurrence before clicking 'Create'

Flow designer > Recurrence trigger card > Show advanced options

Configure the Recurrence trigger

Click the 'Recurrence' trigger card to expand its settings. Set the 'Interval' to 1 and 'Frequency' to 'Day' for a once-daily morning check, or set Frequency to 'Hour' with Interval 4 for more frequent checks throughout the workday. Set the 'Start time' to your team's local morning time in UTC — for a 8am EST start, enter '2024-01-01T13:00:00Z'. Leave time zone set to UTC unless you explicitly add a time zone field.

1. 1Click the 'Recurrence' card to open its configuration panel
2. 2Set 'Interval' to 1
3. 3Set 'Frequency' to 'Day'
4. 4Click 'Show advanced options'
5. 5Enter the start time in UTC format, e.g. '2024-01-01T13:00:00Z' for 8am EST

Flow designer > + New step > Search 'Todoist' > List tasks

Add the Todoist 'List tasks' action

Click '+ New step' below the trigger. In the search bar, type 'Todoist' and select it from the connector list. Choose the action 'List tasks'. This action pulls all tasks from a project you specify, which you'll then filter for deadline proximity in the next step. If you haven't connected Todoist before, Power Automate will prompt you to sign in.

1. 1Click '+ New step'
2. 2Type 'Todoist' in the connector search bar
3. 3Select the Todoist connector
4. 4Choose 'List tasks' from the action list
5. 5Click 'Sign in' if prompted and authorize with your Todoist credentials

Flow designer > List tasks card > Project Id dropdown

Select the target Todoist project

In the 'List tasks' action card, click the 'Project Id' dropdown. Power Automate will fetch your Todoist projects via the API and display them by name. Select the project containing the tasks you want to monitor — for example, 'Q2 Product Roadmap'. If you want to monitor all projects, you'll need separate 'List tasks' actions per project or a different approach using Todoist's REST API directly via HTTP action.

1. 1Click the 'Project Id' field inside the 'List tasks' card
2. 2Wait for the dropdown to load your Todoist projects
3. 3Select the project you want to monitor for deadlines
4. 4Leave all other fields as default

Flow designer > + New step > Variables > Initialize variable

Initialize a variable to hold today's date

Click '+ New step' and search for 'Initialize variable'. Add this action and name the variable 'TodayDate'. Set the type to 'String'. In the value field, click the expression editor (the 'fx' button) and enter the expression: formatDateTime(utcNow(), 'yyyy-MM-dd'). This gives you today's date in the same format Todoist uses for its due dates, so you can do a clean string comparison in the next step.

1. 1Click '+ New step'
2. 2Search for 'Initialize variable' and select it
3. 3Set 'Name' to TodayDate
4. 4Set 'Type' to String
5. 5Click the 'fx' expression button in the 'Value' field and enter: formatDateTime(utcNow(), 'yyyy-MM-dd')

Flow designer > + New step > Data Operation > Filter array

Apply a filter to identify due and overdue tasks

Click '+ New step' and add a 'Filter array' action from the Data Operation connector. In the 'From' field, select 'value' from the 'List tasks' dynamic content — this is the array of tasks returned by Todoist. In the filter condition, set the left side to the task's due date field: select 'due date' from dynamic content inside the Filter array. Set the operator to 'is less than or equal to'. Set the right side to the TodayDate variable. This catches tasks due today and any that are already overdue.

1. 1Click '+ New step'
2. 2Search 'Filter array' and select it from Data Operation
3. 3In the 'From' field, select 'value' from List tasks dynamic content
4. 4Click 'Edit in advanced mode' to write the condition manually
5. 5Enter: @lessOrEquals(item()?['due']?['date'], variables('TodayDate'))

Flow designer > + New step > Control > Apply to each

Add an Apply to each loop over filtered tasks

Click '+ New step' and add an 'Apply to each' control action. In the 'Select an output from previous steps' field, select 'Body' from the Filter array dynamic content. Every action you add inside this loop will run once per task that matched the deadline filter. This is where you'll build and send the Slack message in the next step.

1. 1Click '+ New step'
2. 2Select 'Control' category
3. 3Choose 'Apply to each'
4. 4In the output field, select 'Body' from the Filter array dynamic content

Flow designer > Apply to each > + Add an action > Control > Condition

Add a Condition to split overdue vs. due today

Inside the 'Apply to each' loop, add a 'Condition' control. Set the left value to the task's due date from dynamic content. Set the operator to 'is less than'. Set the right value to the TodayDate variable. The 'Yes' branch handles overdue tasks and the 'No' branch handles tasks due today. You'll post different Slack messages in each branch — overdue gets a red warning prefix, due today gets a yellow reminder prefix. This gives recipients immediate context without opening Todoist.

1. 1Inside the Apply to each loop, click '+ Add an action'
2. 2Search 'Condition' and select it from Control
3. 3In the left value field, pick the task due date from dynamic content
4. 4Set the operator dropdown to 'is less than'
5. 5In the right value field, select the TodayDate variable

Flow designer > Apply to each > Condition > If yes > + Add an action > Slack > Post message

Post overdue task alert to Slack (Yes branch)

Inside the 'If yes' branch, add the Slack action 'Post message'. Connect your Slack workspace if prompted — Power Automate will redirect you to Slack's OAuth page. Set the 'Channel name' field to your target channel, e.g. #project-alerts. In the 'Message text' field, build a message using dynamic content: start with a literal string '🔴 OVERDUE: ', then add the task content field, then ' | Due: ', then the task due date field. This gives your team all the critical info in one line without clicking through to Todoist.

1. 1Inside the 'If yes' branch, click '+ Add an action'
2. 2Search 'Slack' and select the Slack connector
3. 3Choose 'Post message' action
4. 4Authorize Slack via OAuth if prompted — select the correct workspace
5. 5Set Channel name to your target Slack channel (e.g. project-alerts)
6. 6Build the message: type '🔴 OVERDUE: ' then insert Content dynamic content, then ' | Due: ' then due date dynamic content

Flow designer > Apply to each > Condition > If no > + Add an action > Slack > Post message

Post due-today task reminder to Slack (No branch)

Inside the 'If no' branch, add another Slack 'Post message' action. Use the same channel as the overdue alert. For the message text, prefix with '🟡 DUE TODAY: ' followed by the task content dynamic content and due date. Using the same channel for both overdue and due-today keeps all deadline-related noise in one place, making it easy to scan. If you want these separated, use different channels per branch.

1. 1Inside the 'If no' branch, click '+ Add an action'
2. 2Search 'Slack' and select Post message
3. 3The existing Slack connection will be reused automatically
4. 4Set Channel name to the same channel as the Yes branch
5. 5Build the message: type '🟡 DUE TODAY: ' then insert Content and due date dynamic content

Flow designer > Save > Test > Manually > Run flow

Test the flow and verify Slack output

Click 'Save' in the top right of the flow designer, then click 'Test' and choose 'Manually' to trigger a test run immediately without waiting for the schedule. Watch the run history panel — each step turns green on success or red on failure. Click into the Filter array step to see how many tasks it returned. Check your Slack channel to confirm messages arrived with the correct format and emoji prefix. If zero tasks appear, temporarily modify a Todoist task to have a past due date to force a match.

1. 1Click 'Save' in the top right corner
2. 2Click 'Test' next to the Save button
3. 3Select 'Manually' and click 'Run flow'
4. 4Watch the step-by-step execution in the run panel
5. 5Open your Slack channel and confirm the alert messages appeared

Paste this expression into a 'Compose' action inside the Apply to each loop, before the Slack Post message step. Reference the Compose output in the Slack message field instead of building the string manually. This keeps message formatting consistent and easier to update.

if(
  less(item()?['due']?['date'], variables('TodayDate')),
  concat(

if(
  less(item()?['due']?['date'], variables('TodayDate')),
  concat(
    '🔴 OVERDUE: ',
    item()?['content'],
    ' | Due: ',
    item()?['due']?['date'],
    ' | Priority: ',
    if(equals(item()?['priority'], 4), 'Urgent',
      if(equals(item()?['priority'], 3), 'High',
        if(equals(item()?['priority'], 2), 'Medium', 'Normal')
      )
    ),
    ' | ',
    item()?['url']
  ),
  concat(
    '🟡 DUE TODAY: ',
    item()?['content'],
    ' | Due: ',
    item()?['due']?['date'],
    ' | ',
    item()?['url']
  )
)