API testing guides — test REST and GraphQL APIs, write contract tests, and automate API validation.
Testing
One of the hardest parts of building integration tests is creating realistic test data. You can write mock responses by hand, but they drift from reality. You can call the real API in tests, but that introduces network dependency and flakiness. Hoverfly solves this with a record-and-replay approach. It runs
Testing
Testing React components that fetch data requires handling asynchronous behavior, loading states, error conditions, and successful renders. The combination of Mock Service Worker (MSW) and React Testing Library gives you a powerful toolkit for writing these tests without mocking at the module level or coupling your tests to implementation details.
Testing
API mocking is one of those techniques that transforms development speed. When backend services are unavailable, slow, or expensive to call in tests, a local mock server lets you develop and test against realistic API responses without any network dependency. Mockoon is the simplest tool available for this job. It&
Protobuf
Protocol Buffers (Protobuf) is not just a serialization format — it's a schema system. When you change a .proto file, you're changing a contract that potentially affects every service that uses it. Testing Protobuf schemas means validating not just that serialization works, but that your changes don&
gRPC
Choosing between gRPC and REST involves architecture trade-offs that extend into your testing stack. The way you test these protocols differs significantly — in tooling, debugging overhead, contract management, and the kind of bugs each approach catches. This comparison focuses on the practical testing reality of each protocol, not just their
gRPC
gRPC services are harder to test than REST APIs. HTTP endpoints accept plain JSON you can curl in seconds; gRPC uses binary Protobuf encoding over HTTP/2 and requires generated client code to send requests. This complexity shows up in your test setup. This guide covers a complete gRPC testing
Testing
Hoppscotch started life as Postwoman — a browser-based API client created as a fast, free, open-source alternative to Postman. The name changed to Hoppscotch in 2021, but the mission stayed the same: give developers a full-featured API testing tool they can open in any browser, with nothing to install, no account
Testing
Choosing an API client in 2026 is more complicated than it was five years ago. Postman has moved aggressively toward the cloud and enterprise. Insomnia changed owners and briefly required login for basic use. Bruno emerged as the Git-native alternative. Hoppscotch runs in the browser. Thunder Client lives inside VS
Testing
Insomnia is one of the most polished open-source API clients available. Originally built as a lightweight Postman alternative focused on great UX, it was acquired by Kong in 2019 and has since evolved into a full-featured platform with REST, GraphQL, and gRPC support, an OpenAPI design editor, a powerful plugin
Testing
In 2023, Postman announced it was sunsetting its free Scratch Pad — the local-only workspace that kept collections entirely on your machine. If you wanted to use Postman, you had to sync everything to Postman's cloud. For teams that work with sensitive APIs, financial data, or internal microservices, that
Testing
Most developers know how to send an API request. Fewer know how to build an API test suite that stays reliable as the API evolves, runs consistently in CI, and actually catches regressions before they reach production. The difference between a collection of saved requests and a genuine test suite
Testing
Testing REST APIs in Java has a reputation for being verbose. You set up an HTTP client, construct requests, execute them, parse the response, and then write assertions against the parsed data — often 20+ lines for a simple GET test. REST Assured changes this. It provides a fluent, BDD-style API