Follow a request from the moment it enters NestJS until the final response leaves your server.
When a request reaches a NestJS application, it can pass through several framework components before the controller method finally handles it. Middleware, guards, interceptors, pipes, and exception filters can all participate in this process.
Knowing the request lifecycle helps you understand where different pieces of logic belong. For example, authentication can happen in guards, validation in pipes, response transformation in interceptors, and error formatting in exception filters.
What you'll walk away knowing