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Middleware | NestJS - A progressive Node.js framework

docs.nestjs.com · 3,444 words · saved by 1 readers

Middleware is a function which is called before the route handler. Middleware functions have access to the request and response objects, and the next() middleware function in the application’s request-response cycle. The next middleware function is commonly denoted by a variable named next. Nest middleware are, by default, equivalent to express middleware. The following description from the official express documentation describes the capabilities of middleware: You implement custom Nest middleware in either a function, or in a class with an @Injectable() decorator. The class should implement the NestMiddleware interface, while the function does not have any special requirements. Let's start by implementing a simple middleware feature using the class method. Nest middleware fully supports Dependency Injection. Just as with providers and controllers, they are able to inject dependencies that are available within the same module. As usual, this is done through the constructor. There is n

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