Testing
Prism: Spin Up a Mock Server from Your OpenAPI Spec
API-first development means writing your OpenAPI specification before writing code.
API Testing
API testing guides — test REST and GraphQL APIs, write contract tests, and automate API validation.
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Testing
Mock Service Worker (MSW): Intercept API Calls in Tests
Most API mocking libraries intercept calls at the code level — patching fetch, wrapping axios, or monkey-patching network modules.
Testing
Mountebank: Multi-Protocol Service Virtualization for Testing
Most API mocking tools only speak HTTP. That's fine for REST APIs, but modern systems include gRPC services, legacy TCP protocols, SMTP servers, and binary protocols that HTTP-only tools can't touch. Mountebank is a service virtualization tool that handles multiple protocols through a unified interface.
Testing
Hoverfly: Capture and Simulate API Traffic for 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.
Testing
Testing React with MSW and Testing Library: End-to-End Example
Testing React components that fetch data requires handling asynchronous behavior, loading states, error conditions, and successful renders.
Testing
Mockoon: The Easiest Way to Mock REST APIs Locally
API mocking is one of those techniques that transforms development speed.
Protobuf
Protobuf Testing: Validating Schemas & Serialization
Protocol Buffers (Protobuf) is not just a serialization format — it's a schema system.
gRPC
gRPC vs REST: Testing Trade-offs & Tools
Choosing between gRPC and REST involves architecture trade-offs that extend into your testing stack.
gRPC
gRPC Testing Guide: Unit, Integration & E2E Tests
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: Free Browser-Based API Testing Tool Getting Started Guide
Hoppscotch started life as Postwoman — a browser-based API client created as a fast, free, open-source alternative to Postman.
Testing
Postman vs Insomnia vs Bruno: Which API Tool Is Right for You?
Choosing an API client in 2026 is more complicated than it was five years ago. Postman has moved aggressively toward the cloud and enterprise.
Testing
Insomnia REST Client Tutorial: API Testing with Collections and Tests
Insomnia is one of the most polished open-source API clients available.