API Testing

Functional Testing: Verify correct behavior and responses
Integration Testing: Test how APIs work together
Load Testing: Measure performance under high traffic
Security Testing: Check for vulnerabilities

The process of verifying that APIs work correctly, securely, and perform well.

API testing validates that application programming interfaces meet functionality, reliability, performance, and security requirements.

Types of API Testing

Jest API Test

test("GET /users returns 200", async () => {
  const res = await fetch("/api/users");
  expect(res.status).toBe(200);
});

A fake server that simulates API responses for testing and development purposes.

An architectural style for building web APIs using HTTP methods and stateless communication.

A protocol enabling full-duplex, real-time communication between client and server.

The time delay between a request being sent and a response being received.