API Monitoring ensures your APIs remain reliable, fast, and available. In Postman, monitoring allows you to run collections on a schedule, validate responses, track performance, and receive alerts when something breaks.
? Key Concepts
Scheduled Runs — Automatically execute collections at fixed intervals
Tests — Validate status codes, headers, and response data
Performance — Measure response times and failures
Alerts — Get notified on failures or threshold breaches
Reports — Historical data and trends
? Syntax / Theory
Postman Monitors run a collection using the same requests and tests you define in your collection. Each request can include JavaScript-based tests using the Postman Sandbox.
? View Code Example
// Basic Postman test to validate API response
pm.test("Status code is 200", function () {
pm.response.to.have.status(200);
});
? Code Example(s)
? View Code Example
// Check response time and response body content
pm.test("Response time is under 500ms", function () {
pm.expect(pm.response.responseTime).to.be.below(500);
});
pm.test("Response contains success flag", function () {
const jsonData = pm.response.json();
pm.expect(jsonData.success).to.eql(true);
});
? Live Output / Explanation
? Monitor Results
Each scheduled run produces a report showing:
Passed and failed tests
Average response time
Error messages
Execution history
⚡ Interactive Monitor Simulator
Click below to simulate a scheduled Postman Monitor check on api.service.com/v1/health
> Waiting for trigger...
? Interactive Example / Diagram
? View Code Example
// Visual flow of Postman Monitor execution
Collection → Scheduled Run → Request Execution → Tests → Report → Alerts
?️ Use Cases
Detect downtime in production APIs
Track performance degradation
Validate third-party API availability
Ensure SLA compliance
Automated regression monitoring
? Tips & Best Practices
Reuse the same collection for testing and monitoring
Keep monitors lightweight and focused
Set realistic response time thresholds
Use environment variables for URLs and tokens
Review monitor reports regularly
? Try It Yourself
Create a simple API collection in Postman
Add at least two test scripts
Create a monitor and schedule it every 15 minutes
Intentionally break an endpoint and observe alerts