Middleware functions
The middleware() is a core concept of node js. These functions can access the ‘req’ and ‘res’ response object. They can modify these object before reaching the route handler. The following program demonstrates the Middleware function.
Example: Below is the code example of the middleware and express function.
Javascript
const express = require('express');const app = express();// Middleware functionconst logger = (req, res, next) => { res.send("Geeks for Geeks"); next(); // Call the next middleware function in the chain};// Use the middleware for all routesapp.use(logger);// Start the serverconst PORT = 3000;app.listen(PORT, () => { console.log(`Server is running on port ${PORT}`);}); |
Output:
How to use Global functions in Express JS?
In this article, we will learn the global function of Express. Express JS is a web application framework for Node JS. This framework runs on the server-side framework. It is a trendy Express JS framework for building scalable web applications.
There are many functions available in Express JS that are global:
Table of Content
- What is the Global function in Express JS?
- express()
- Middleware functions
- Define Custom Global function: