@hapi/jwt is a JSON Web Token (JWT) authentication library that's part of the hapi ecosystem, designed to work seamlessly with the hapi web framework but also functional as a standalone module. It provides JWT token generation, validation, and authentication capabilities for Node.js applications, with support for various signing algorithms and token management features. The library is ideal for developers building secure web applications who need JWT-based authentication, whether they're using hapi or other Node.js frameworks.