Automate Slack & Trello

Stop paying for mismatched spreadsheets. Sync data between Slack and Trello in real-time, so you can manage your operations without the busywork.

Get This Workflow Built

Custom API Integration

Secure Data Transfer

Done-For-You Setup

How the Data Flows

graph LR
    subgraph Source ["Slack"]
        T1(["Fetch Custom Actions"])
    end
    
    subgraph Middleware ["Enterprise Integration Core"]
        W[Webhook
Listener] --> V{Validation
& Auth}
        V -->|Fail| DLQ[Dead Letter
Queue]
        V -->|Pass| Map[Data Mapping
& Transformation]
        Map --> Retry[Rate Limiting
& Retries]
    end
    
    subgraph Target ["Trello"]
        A1(["Add Attachment to Card"])
    end

    T1 -->|JSON Payload| W
    Retry -->|Authenticated API POST| A1

    style Source fill:transparent,stroke:#cbd5e1,stroke-dasharray: 5 5
    style Target fill:transparent,stroke:#cbd5e1,stroke-dasharray: 5 5
    style Middleware fill:#f8fafc,stroke:#94a3b8,stroke-width:2px
    style T1 fill:#3b82f6,stroke:#fff,stroke-width:2px,color:#fff
    style W fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style V fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style Map fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style Retry fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style DLQ fill:#ef4444,stroke:#fff,stroke-width:1px,color:#fff
    style A1 fill:#e11d48,stroke:#fff,stroke-width:2px,color:#fff

When teams communicate via Slack without integration into Trello, project updates can easily be missed. For instance, if a team member announces a task completion in a Slack channel, that information may not be reflected in Trello, leading to outdated project boards. This results in project managers wasting hours manually checking Slack for updates and cross-referencing them with Trello, risking further delays and miscommunication.

Top Ways to Automate Slack & Trello

Automated Task Notifications: Instantly receive Slack notifications when a Trello card is created, updated, or moved, ensuring your team is always informed and aligned on project progress.
Daily Standup Reminders: Automatically generate and send a daily summary of Trello board activities to a designated Slack channel, keeping everyone updated on key tasks and deadlines.
Comment Syncing: Enable real-time syncing of comments between Trello cards and Slack threads, ensuring that discussions are captured and accessible in both platforms for enhanced collaboration.

How to Build the Slack → Trello Sync

In Slack, set up a Standard Webhook by navigating to the 'Apps' section and selecting 'Incoming Webhooks'. Create a new webhook and choose the channel where task updates will be posted.
Copy the generated webhook URL. This will be the endpoint that listens for messages related to task completions.
In Trello, identify the API endpoint for creating a new card: POST https://api.trello.com/1/cards.
Set up a listener on the Slack webhook URL to capture incoming messages. Extract the relevant data from the payload, such as task name and completion status.
Format the extracted data into a JSON payload that includes the 'name' and 'desc' fields for the Trello card.
Make an HTTP POST request to the Trello API endpoint with the formatted JSON payload, including your Trello API key and token as query parameters.

Developer Warnings & API Gotchas

Ensure that the task names in Slack match the expected naming conventions in Trello. Any discrepancies can lead to duplicate cards or failed creations.
Be cautious with the payload size; Slack messages may contain rich formatting that could exceed Trello's character limits for card descriptions.
Verify that the webhook is configured to only trigger on relevant messages to avoid unnecessary API calls to Trello, which could lead to data clutter.

Supported API Operations

We leverage official, stable endpoints to ensure secure data transfer. No deprecated legacy routes.

When this happens in Slack... Fetch Custom Actions

Do this in Trello Add Attachment to Card
When this happens in Slack... List Canvas Sections

Do this in Trello Add Checklist to Card
When this happens in Slack... List Canvases

Do this in Trello Add Label to Card
When this happens in Slack... List Channels available for User

Do this in Trello Add Member to Board
When this happens in Slack... List Private Channels available for User

Do this in Trello Add Members to Card

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I can see you're looking at mapping Slack to Trello. Tell me about your current setup—what's the specific bottleneck you're trying to automate right now?