From the course: Mastering Nest.js: Build Scalable Applications with Mastery in Nest.js Framework

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Implementing middleware

Implementing middleware - Nest.js Tutorial

From the course: Mastering Nest.js: Build Scalable Applications with Mastery in Nest.js Framework

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Implementing middleware

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Now, let's understand how to implement middleware in NestJS. So first, let me create a folder, I'll name it as middleware. Inside this folder, I'll create a file called logging.middleware.ts. Here the dot middleware is the naming convention, but is not strictly necessary. It's more of a convention to make it clear that the file contains middleware code. Now inside the file, we will first provide the injectable decorator, as we are going to create a class and market as a middleware. And in order to use that class anywhere in the application, we give the injectable decorator. Let me create a class. I'll give export class and the class name LoggingMiddleware. Now in order to mark this class as a middleware, we will use an interface called NestMiddleware. So let me give implements NestMiddleware. So whenever we want to create a middleware, we always use the NestMiddleware interface. This interface offers a standard method that is used for specifically defining middleware logic, and that…

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