API Testing
Test REST, GraphQL and secure APIs end-to-end.
Topics in API Testing
Six focused clusters under this hub. Tap any topic to filter the article list.
Latest in API Testing
Latest Test Query Format: The Complete Guide for QA Engineers (SQL, API & Search)
The definitive test query format guide for QA — copy-paste SQL, REST/GraphQL and Postman templates, a UAT test-case wrapper, and a Google search operator cheat sheet you can ship today.
Read article5 Critical API Testing Mistakes That Let Lethal Bugs Slip Into Production (2026)
Only asserting HTTP 200 OK? The 5 lethal API testing mistakes that cause outages — BOLA/IDOR, schema drift, rate-limit flakes, hardcoded secrets and siloed CRUD — with production-grade Playwright + Zod TypeScript.
Read articleGraphQL API Testing Guide: Complete 2026 Handbook
Complete 2026 GraphQL API testing guide. Schema validation, query testing, mutation testing, security testing, and tooling for Jest, Postman, and Karate.
Read articleMicroservices Testing Strategy: Complete 2026 Guide
Complete 2026 microservices testing strategy. Contract testing with Pact, integration testing with Testcontainers, service virtualization, and E2E patterns.
Read article12 Best API Testing Tools for Enterprise (2026)
The 12 best API testing tools for enterprise teams in 2026. Postman, REST Assured, Karate, Pact, ReadyAPI, and more compared with pricing, scoring, and ROI.
Read articleRestSharp API Testing in C#: Complete Guide
Learn RestSharp API testing in C# with step-by-step examples in 2026. Setup, GET/POST/PUT/DELETE, authentication, JSON serialization, and CI/CD integration.
Read articleRestSharp C# API Automation: Complete 2026 Guide
Complete RestSharp C# API automation guide for 2026. Setup, CRUD operations, authentication, schema validation, mocking, and CI/CD integration.
Read articleREST Assured Java Tutorial: Complete 2026 Guide
Complete REST Assured Java tutorial for 2026. Setup, GET/POST/PUT/DELETE, authentication, JSON path, schema validation, reusable specs, and CI/CD integration.
Read article10 Best Free API Mock Testing Tools (2026 Comparison)
The 10 best free API mock testing tools in 2026. WireMock, MockServer, Postman Mock Servers, Hoverfly, Prism compared with setup, features, and best use cases.
Read articleTop 40 API Testing Interview Questions & Answers (2026)
Ace your API testing interview with 40 real-world questions covering REST, Postman, status codes, authentication, contract testing and more. Free, with hands-on examples.
Read articlePostman Interview Questions & Answers (2026): 35+ Real Questions for QA Engineers
35+ Postman interview questions for 2026 — collections, environments, variables, scripts, Newman, CI integration, mock servers, monitors and contract testing. With code snippets.
Read articleAPI Testing: The Ultimate Guide (2026 Tutorial)
The most complete API testing tutorial for 2026 — REST, GraphQL, Postman, REST Assured, RestSharp, contract testing, security, performance, automation and CI/CD. With code examples and interview prep.
Read articlePostman API Testing: Beginner to Advanced (2026)
The 2026 complete Postman API testing tutorial. Step-by-step from first request to collections, environments, scripting, data-driven testing, Newman CLI, mock servers, monitors, and CI/CD.
Read article10 Best Postman Alternatives for API Testing (2026)
Top 10 Postman alternatives for API testing in 2026 — Insomnia, REST Assured, Bruno, Hoppscotch, Thunder Client, Karate, SoapUI, HTTPie, curl and ReadyAPI compared with features, pricing, and best use cases.
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