Middleware Chaining
Middleware can be chained from one to another, Hence creating a chain of functions that are executed in order. The last function sends the response back to the browser. So, before sending the response back to the browser the different middleware processes the request.
The next() function in the express is responsible for calling the next middleware function if there is one.
Modified requests will be available to each middleware via the next function
Middleware chaining example
In the above case, the incoming request is modified and various operations are performed using several middlewares, and middleware is chained using the next function. The router sends the response back to the browser.
Middleware in Express
Express serves as a routing and Middleware framework for handling the different routing of the webpage and it works between the request and response cycle.
Middleware gets executed after the server receives the request and before the controller actions send the response. Middleware has and access to the request object, responses object, and next, it can process the request before the server sends a response. An Express-based application is a series of middleware function calls. In this article, we will discuss what is middleware in express.js.
Middleware working