JavaScript middleware

Yes, Node. js can be used in both the frontend and backend of applications.

Middleware functions are functions that have access to the request object (req), the response object (res), and the next middleware function in the application’s request-response cycle . These functions are used to modify req and res objects for tasks like parsing request bodies, adding response headers, etc.

Middleware functions are functions that have access to the request object ( req ), the response object ( res ), and the next middleware function in the application’s request-response cycle . The next middleware function is commonly denoted by a variable named next .

Built on JavaScript, which is traditionally a frontend, client-side web scripting language, Node. js extends the capabilities of JavaScript to run on the backend , server-side portion of a web application architecture, as well as for serverless architecture.