n8n Workflow: Realtime Notion & Todoist 2-Way Sync with Redis (Placeholder)

This n8n workflow demonstrates a robust framework for real-time, two-way synchronization between Notion and Todoist, leveraging Redis for state management. While the provided JSON is a placeholder and does not contain the full logic for actual Notion or Todoist operations, it outlines the architectural components necessary for such a system.

Note: The provided JSON is a placeholder and mainly contains core n8n nodes. It does not include the specific configurations for Notion, Todoist, or Redis operations. To make this workflow fully functional for two-way sync, you would need to implement the detailed logic within the HTTP Request, Redis, Notion, and Todoist nodes, as well as the conditional logic in the If and Switch nodes.

What it does (Architectural Outline)

This workflow is designed to:

1. Receive Webhook Events: Act as an entry point for real-time updates from either Notion or Todoist (or both).
2. Process Incoming Data: Use HTTP Request to potentially fetch or send data, and Code nodes for custom data manipulation.
3. Manage State with Redis: Interact with a Redis database to store and retrieve synchronization states, preventing infinite loops or duplicate entries during two-way sync.
4. Conditional Routing: Utilize If and Switch nodes to direct the workflow based on the type of event (e.g., Notion update vs. Todoist update, create vs. update vs. delete).
5. Data Transformation: Employ Edit Fields (Set), HTML, Aggregate, and Split Out nodes to prepare data for different services.
6. Compare Datasets: Use Compare Datasets to identify changes between the current state and the synchronized state in Redis.
7. Synchronize with Notion: (Placeholder) Interact with Notion to create, update, or delete tasks/items.
8. Synchronize with Todoist: (Placeholder) Interact with Todoist to create, update, or delete tasks.
9. Handle Errors: Include Stop and Error nodes for robust error handling.
10. Respond to Webhooks: Send responses back to the originating service if required.
11. Sub-workflow Execution: Potentially execute other n8n workflows for modularity.
12. Scheduled Operations: Include a Schedule Trigger for periodic checks or maintenance tasks.

Prerequisites/Requirements

To make this workflow fully functional, you will need:

• n8n Instance: A running instance of n8n.
• Notion Account: With API access and an integration set up.
• Todoist Account: With API access.
• Redis Instance: A running Redis server for state management.
• Credentials: Configured n8n credentials for:
  • Notion API
  • Todoist API
  • Redis
  • Any other HTTP endpoints used.
• Webhook Endpoints: Configured webhooks in Notion and Todoist to trigger this n8n workflow.

Setup/Usage

1. Import the Workflow:
   • Copy the provided JSON.
   • In your n8n instance, go to "Workflows" and click "New".
   • Click the three dots next to "New Workflow" and select "Import from JSON".
   • Paste the JSON and click "Import".
2. Configure Credentials:
   • Locate the Notion, Todoist, and Redis nodes (and any HTTP Request nodes that require authentication).
   • Click on each node and configure the necessary credentials. If you don't have them set up, you'll need to create new credentials in n8n.
3. Configure Webhooks:
   • Open the Webhook trigger node.
   • Copy the "Webhook URL".
   • Go to your Notion and Todoist settings and configure webhooks to send events to this URL. You will need to define which events (e.g., task created, updated, deleted) should trigger the webhook.
4. Implement Core Logic:
   • The HTTP Request, Redis, Notion, Todoist, If, Switch, and Code nodes are placeholders. You will need to add the specific API calls, data transformations, and conditional logic to perform the actual two-way sync. This includes:
     • Parsing Webhook Data: Extracting relevant information from incoming Notion/Todoist webhook payloads.
     • Redis Operations: Storing and retrieving item IDs and last updated times to track sync status and prevent loops.
     • Notion/Todoist API Calls: Making API requests to create, update, or delete items in the respective services based on changes detected.
     • Conflict Resolution: Implementing logic to handle potential conflicts if an item is updated in both Notion and Todoist simultaneously.
5. Activate the Workflow: Once configured and tested, activate the workflow in n8n.