Automate API Monitoring and Testing with n8n

n8n automates API testing by integrating with Postman, REST Assured, and webhooks. This workflow ensures API health, alerts on failures, and logs test results.

• n8n installed.

• API endpoints to test.

• Postman collection with test scripts.

• Slack or Microsoft Teams for alerts.

• Logging database (e.g., PostgreSQL, MySQL).

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 }}');

• Flow: Webhook → API Test (Postman) → Conditional Check → Slack Alert (if failure) → Log to Database 

• Execution Time: ~5 seconds

• Automated API monitoring 

• Instant failure alerts to DevOps teams 

• Logs stored for debugging & audit compliance

• Webhook Failure: Verify webhook URL. 

• API Unreachable: Check endpoint health manually. 

• Slack Alerts Not Sent: Confirm Slack bot permissions.

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