Express.js Middleware
Express.js, a popular web framework for NodeJS, heavily utilizes middleware for request processing. Middleware functions in Express.js can be added using the app.use()
method or specific HTTP method functions such as app.get()
, app.post()
, etc., to specify middleware for specific routes.
// Custom middleware function
const loggerMiddleware = (req, res, next) => {
console.log(`[${new Date().toISOString()}] ${req.method} ${req.url}`);
next(); // Call the next middleware function
};
// Add middleware to handle all requests
app.use(loggerMiddleware);
Explain the concept of middleware in NodeJS
Middleware in NodeJS refers to a software design pattern where functions are invoked sequentially in a pipeline to handle requests and responses in web applications. It acts as an intermediary layer between the client and the server, allowing for modularization of request processing logic and enabling cross-cutting concerns such as authentication, logging, error handling, and data transformation. Let’s delve deeper into the concept of middleware in NodeJS.
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