No, Ajax is not dead in Javascript. Ajax is still widely used in web development, especially in modern web applications that rely heavily on dynamic user interfaces and asynchronous data retrieval.
In fact, many popular Javascript libraries and frameworks such as jQuery, Angular, and React provide built-in support for making Ajax requests, which indicates that Ajax is still a widely used technology in web development.
While there are newer and alternative technologies such as WebSockets and Server-Sent Events that can handle real-time communication, Ajax still has its place in modern web development and will likely continue to be used for the foreseeable future.