AI/ML
Automate API Monitoring and Testing with n8n
Overview
n8n automates API testing by integrating with Postman, REST Assured, and webhooks. This workflow ensures API health, alerts on failures, and logs test results.
Prerequisites
n8n installed.
API endpoints to test.
Postman collection with test scripts.
Slack or Microsoft Teams for alerts.
Logging database (e.g., PostgreSQL, MySQL).
Workflow Setup
1. Prepare n8n Environment
Navigate to http://localhost:5678 (or your hosted n8n URL) and log in.
Click Workflows > + New, then name it (e.g., "API Health Monitor").
Click + to open the node selector.
2. Trigger Node: Webhook
Node: Webhook
Settings:
Path: api-monitoring
Method: GET
Output: API endpoint response
3. Test Execution Node: Postman
Node: HTTP Request
Settings:
Method: GET/POST (as per API spec)
URL: API endpoint URL
Headers: Authentication tokens (if required)
Output: API response
4. Error Handling Node: Conditional Check
Node: IF
Settings:
Condition: If {{ $node["HTTP Request"].json.status_code }} != 200, trigger alert.
5. Alert Node: Slack (or Microsoft Teams)
Node: Slack
Settings:
Channel: #api-alerts
Message: "API {{ $node["HTTP Request"].json.url }} failed with status {{ $node["HTTP Request"].json.status_code }}."
6. Logging Node: Database (PostgreSQL/MySQL)
Node: PostgreSQL
Settings:
Query: INSERT INTO api_logs (timestamp, url, status_code) VALUES (NOW(), '{{ $node["HTTP Request"].json.url }}', '{{ $node["HTTP Request"].json.status_code }}');
Workflow Summary
Flow: Webhook → API Test (Postman) → Conditional Check → Slack Alert (if failure) → Log to Database
Execution Time: ~5 seconds
Benefits
Automated API monitoring
Instant failure alerts to DevOps teams
Logs stored for debugging & audit compliance
Troubleshooting
Webhook Failure: Verify webhook URL.
API Unreachable: Check endpoint health manually.
Slack Alerts Not Sent: Confirm Slack bot permissions.
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