Hapi.js (pronounced “happy”) is a popular open-source Node.js framework used for building web applications and services. It provides a robust set of features for creating HTTP servers, handling requests, and building APIs, making it an ideal choice for creating scalable and maintainable server-side applications. Hapi.js emphasizes modularity, extensibility, and configurability, enabling developers to customize and extend its core functionality as needed. It includes built-in support for features such as routing, input validation, authentication, and caching, as well as for integrating with external systems such as databases, message queues, and caching servers. Additionally, Hapi.js has a large and active community of developers, which has contributed a wide range of plugins and extensions to the framework. With its rich feature set, flexibility, and community support, Hapi.js has become a popular choice for building complex web applications and APIs.