http-client

Insomnia is an open-source, cross-platform API client for testing and debugging REST, GraphQL, gRPC, WebSockets, and other HTTP protocols with collaborative design and testing features.

A lightweight REST API client extension for Visual Studio Code that enables developers to test HTTP APIs directly within their code editor without requiring external tools.

A comprehensive comparison of four popular API development and testing tools: Postman (commercial platform), Insomnia (Kong's cross-platform client), Thunder Client (VS Code extension), and Hoppscotch (open-source ecosystem) - covering features, performance, pricing, and use cases.