n8n Workflow: Two-Way Sync for Notion and Google Calendar (Placeholder)

This n8n workflow is designed to facilitate a two-way synchronization between Notion and Google Calendar. It listens for changes in both platforms and attempts to keep events and database items consistent between them.

Note: The provided JSON is a placeholder and does not contain the full logic for a functional two-way sync. It primarily outlines the nodes that would be involved in such a workflow. The actual implementation details (e.g., specific operations, data mapping, and filtering conditions) are not present in this JSON.

What it does

Based on the nodes present in the JSON, a complete two-way sync workflow would typically involve the following steps:

1. Trigger from Notion: Listens for new or updated database items in Notion.
2. Trigger from Google Calendar: Listens for new or updated events in Google Calendar.
3. Process Notion Changes:
   • Retrieves Notion database items.
   • Transforms Notion data into a format suitable for Google Calendar.
   • Checks for existing events in Google Calendar to avoid duplicates.
   • Creates or updates events in Google Calendar based on Notion changes.
4. Process Google Calendar Changes:
   • Retrieves Google Calendar events.
   • Transforms Google Calendar data into a format suitable for Notion.
   • Checks for existing database items in Notion to avoid duplicates.
   • Creates or updates database items in Notion based on Google Calendar changes.
5. Conditional Logic: Uses If and Filter nodes to determine if an item is new, updated, or should be ignored based on specific criteria (e.g., a unique ID indicating it's already synced).
6. Data Transformation: Utilizes Set, Date & Time, Code, and Split Out nodes to manipulate and format data between the two platforms.
7. Batch Processing: Employs Loop Over Items (Split in Batches) to efficiently process multiple items.
8. Merge Results: Combines data streams using the Merge node for unified processing or logging.

Prerequisites/Requirements

To use this workflow, you will need:

• n8n Instance: A running instance of n8n.
• Notion Account: With a database configured for synchronization.
  • Notion API Key: For authentication.
  • Notion Database ID: To specify which database to monitor.
• Google Calendar Account: With the calendar(s) you wish to sync.
  • Google Calendar Credentials (OAuth 2.0): For authentication.
  • Google Calendar ID: To specify which calendar to monitor.

Setup/Usage

1. Import the Workflow: Download the JSON provided and import it into your n8n instance.
2. Configure Credentials:
   • Set up your Notion API Key credentials.
   • Set up your Google Calendar OAuth 2.0 credentials.
3. Configure Trigger Nodes:
   • In the "Notion Trigger" node, select your Notion credentials and the specific database you want to monitor.
   • In the "Google Calendar Trigger" node, select your Google Calendar credentials and the specific calendar you want to monitor.
4. Configure Action Nodes:
   • In the "Notion" and "Google Calendar" action nodes, ensure they are configured with the correct credentials and operations (e.g., "Create," "Update").
5. Implement Logic (Crucial for Two-Way Sync):
   • Unique ID Mapping: You will need to implement a mechanism (e.g., using a dedicated property in Notion and a custom property or extended property in Google Calendar) to store the ID of the corresponding item in the other service. This is vital to prevent infinite loops and correctly identify updates.
   • Filtering and Deduplication: Configure the "If" and "Filter" nodes to check for these unique IDs. For example, if a Notion item has a Google Calendar ID, it means it's already synced, and subsequent updates should trigger an "update" operation in Google Calendar, not a "create."
   • Data Mapping: Use the "Edit Fields (Set)" and "Code" nodes to map the relevant fields between Notion database properties (e.g., Title, Date, URL) and Google Calendar event properties (e.g., Summary, Start/End Date, Description).
6. Activate the Workflow: Once configured, activate the workflow to start the two-way synchronization.

This README provides a high-level overview based on the node types. A fully functional two-way sync requires careful implementation of the logic within the If, Filter, Set, and Code nodes to handle creation, updates, and prevent circular dependencies.