api-testing

Automated API testing for REST and GraphQL endpoints verifies real responses against expected contracts using Playwright APIRequestContext, Supertest, or direct HTTP clients to execute auth, CRUD, and pagination flows.

Validating API response schemas prevents contract drift by enforcing expected response shapes with Zod 4 or AJV, checking status codes, headers, and timing to catch missing fields before they reach production.

Yes, this API testing approach works with Playwright APIRequestContext and Supertest, supporting standalone test flows for auth, CRUD, error handling, file transfers, webhooks, and performance checks.

The best way to test API auth flows and error handling in CI is using cleanup-safe fixtures with Supertest or Playwright to verify status codes, response shapes, and contract behavior against real test environments.

Checking API performance and timing during endpoint testing involves verifying response latency against performance budgets using HTTP clients, ensuring slow responses are caught before breaking downstream consumers.

Setting up a real test environment for API contract validation requires cleanup-safe fixtures, Zod 4 or AJV for schema validation, and HTTP clients to verify status codes, response shapes, and auth flows accurately.