API Testing Interview Questions - Top 240 Questions

API Testing & Test Automation — Interview Practice TestPrepare with confidence for your next API testing or QA automation interview with this comprehensive 240-question practice test, carefully designed to reflect the depth and breadth of questions asked in real-world technical interviews across all experience levels.Structured across six focused modules, this practice test covers every stage of the API testing landscape — from foundational HTTP concepts through to enterprise-level automation and CI/CD pipeline practices:Module 1 — API Fundamentals: HTTP methods, status codes, REST vs SOAP, request/response structureModule 2 — API Testing Concepts: Test design, authentication, schema validation, mocking, and securityModule 3 — Postman: Collections, environments, scripting, Newman CLI, and CI/CD integrationModule 4 — REST Assured: Given-When-Then syntax, JsonPath, schema validation, and framework setupModule 5 — Cypress & Playwright: cy.request(), APIRequestContext, network interception, and mockingModule 6 — Advanced & CI/CD: Performance testing, security vulnerabilities, pipeline integration, and observabilityThis practice test is built for every level of QA professional — freshers validating core knowledge, mid-level engineers sharpening tool-specific skills, senior testers demonstrating architectural thinking, and SDETs showcasing end-to-end automation expertise.Each of the 240 questions includes detailed explanations for both correct and incorrect answer options — ensuring you understand the reasoning, not just the answer. Questions span multiple-choice and multi-select formats, progressing deliberately from simple through to advanced within every module.By completing all six modules, you will have a precise picture of your strengths, ident