12 articles
A hands-on guide to API testing in C# on .NET 8: HttpClient with xUnit and NUnit, RestSharp, FluentAssertions, JSON schema checks, in-process tests with WebApplicationFactory, and running the suite in CI with dotnet test.
A practical guide to API testing with JavaScript: Jest and Supertest for Node.js services, Playwright's request API for external APIs, JSON Schema validation with Ajv, and a CI workflow, all with runnable code.
How to test API versioning and backward compatibility: URI, header and media-type strategies, breaking vs non-breaking changes, OpenAPI diff tools like oasdiff, consumer contracts, deprecation headers and CI gates.
What JSON Schema validation is and how it works: the 2020-12 draft and its core rules, then runnable examples validating API responses in Python (jsonschema), JavaScript (Ajv), Java (networknt, REST Assured) and Postman, how it aligns with OpenAPI 3.1, and the errors you will hit.
A practical guide to OpenAPI and Swagger API testing: how spec-driven testing works, the six kinds of tests a spec makes possible, a worked pytest and Schemathesis example against the public Petstore API, CI wiring, tools, common mistakes and a checklist.
Apidog and Postman both handle API design, testing, and documentation, but their architectural models differ fundamentally. Apidog treats the OpenAPI spec as the single source of truth, while Postman converts specs into independent collections. This focused comparison covers the differences that matter for team productivity.
Every difference between OpenAPI 3.0 and 3.1 — JSON Schema 2020-12 compatibility, nullable handling, webhooks, exclusiveMinimum/Maximum — with before/after YAML for each change and a step-by-step migration checklist.
Schema-first API development designs the OpenAPI contract before writing implementation code, enabling parallel work, auto-generated tests, mock servers, and continuous contract enforcement. The 2026 playbook for engineering teams.
Migrating from Swagger 2.0 to OpenAPI 3.x unlocks richer test generation, better schema validation, and modern tooling. This step-by-step guide covers spec conversion, test suite updates, and CI/CD pipeline adjustments.
