Insomnia is a versatile, lightweight open-source desktop application designed for API design, testing, and making HTTP requests, supporting REST, gRPC, and GraphQL out of the box. A notable feature of Insomnia is its ability to use plugins, which can significantly enhance its functionality, with nearly 350 plugins available for easy installation. Users can even create custom plugins if existing ones do not meet their needs. The article introduces several useful plugins, such as Faker for generating fake data, Path Parameter for managing dynamic URL values, Dotenv for integrating environment variables, JWT Creator for generating JSON Web Tokens, and theme plugins for customizing the application's appearance. Plugins utilize Insomnia's template tag system to dynamically set values at request time, offering flexibility and customization for various use cases. Users are encouraged to explore the Plugin Hub and even contribute by developing and sharing their own plugins.