Insomnia
Insomnia is an open-source API client and testing tool designed for developers to design, debug, and test REST, GraphQL, gRPC, and WebSocket APIs. It provides a user-friendly interface for sending HTTP requests, organizing API collections, and automating workflows with features like environment variables and scripting. The tool supports collaboration through team workspaces and integrates with version control systems like Git.
Developers should use Insomnia when building or consuming APIs, as it simplifies API testing and debugging with its intuitive GUI, reducing the need for command-line tools like cURL. It is particularly valuable for frontend developers integrating with backends, backend developers testing endpoints, and QA engineers automating API tests, offering advantages like request history, response visualization, and plugin support for custom functionality.