Trello API: Create, Update, Retrieve, and Delete Boards, Lists, and Cards

This workflow automates Trello board management using the Trello API, handling boards, lists, and cards with operations like create, update, get, getAll, and delete. Key nodes include Webhook Trigger (starts via POST), Input Validation (ensures valid action/resource/operation), Resource Router (directs to board/list/card), Board/List/Card Operation Routers (handle specific actions), Board Create/ID Validation (checks name/id), List/Card Create Validation (verifies inputs), Sanitize Board Data (sets defaults), Create/Update/Get/GetAll/Delete Trello Board/List/Card (performs operations), Success Response (returns results), and error nodes (General/Field Validation/Trello API Error) for handling failures.\n\nSetup Requirements and Configuration: Install n8n from n8n.io for self-hosting or sign up at cloud.n8n.io for cloud setup. Follow prompts or create a cloud account. Obtain Trello API credentials from trello.com/app-key: log in, copy API key, generate a token via 'Token' link, and note both. In n8n, import the JSON workflow. Configure Trello nodes (Create/Update/Get/GetAll/Delete Board/List/Card) with API key and token under ‘Credentials’ > ‘Trello API.’ Set Webhook Trigger path to ‘trello-automation,’ configure for POST requests, and add header authentication with a secure key (e.g., ‘Authorization: Bearer your-key’). Ensure server resources support API calls. Verify token permissions for board/list/card operations.\n\nTesting and Deployment Steps: Test with Postman using a POST request to the Webhook URL. Example JSON: {'action': 'create', 'resource': 'board', 'operation': 'create', 'name': 'Test Board'} or {'action': 'getAll', 'resource': 'board', 'operation': 'getAll', 'limit': 10} with authentication header. Success responses return 200 with board/list/card data (id/name). Error nodes return 400 for invalid inputs (e.g., missing name/id) or 500 for API failures. Check logs for errors like ‘Invalid API key’ or ‘Board not found,’ and verify credentials or inputs. Activate workflow in n8n. Validate output: ensure id/name match for create/get/update/delete or list count for getAll. Debug errors using n8n logs for token issues, rate limits, or network problems.