Why Express?

It is one of the fastest ways to create API for consumption, in JS.

that provides a robust set of features for web and mobile applications. It is designed for building web applications and APIs, making it easier to manage server-side logic, routing, and middleware.

Prerequisite

• node js
• npm
• Language: JavaScript

Steps

1. From your target project folder, run the following in terminal: npx express-generator --no-view

2. Install dependencies by running npm install

3. Create a new file items.js so definition can be described:

       var express = require('express');
       var router = express.Router();
   
       // Sample data
       var items = [
       { id: 1, name: 'Item 1' },
       { id: 2, name: 'Item 2' }
       ];
   
       // Get all items
       router.get('/', function(req, res, next) {
       res.json(items);
       });
   
       // Get a single item by id
       router.get('/:id', function(req, res, next) {
       const item = items.find(i => i.id === parseInt(req.params.id));
       if (!item) return res.status(404).send('Item not found');
       res.json(item);
       });
   
       // Create a new item
       router.post('/', function(req, res, next) {
       const newItem = {
           id: items.length + 1,
           name: req.body.name
       };
       items.push(newItem);
       res.status(201).json(newItem);
       });
   
       module.exports = router;

4. Register the items.js file app.js

       var express = require('express');
       var path = require('path');
       var cookieParser = require('cookie-parser');
       var logger = require('morgan');
   
       var indexRouter = require('./routes/index');
       var usersRouter = require('./routes/users');
       var itemsRouter = require('./routes/items'); // Add this line
   
       var app = express();
   
       app.use(logger('dev'));
       app.use(express.json());
       app.use(express.urlencoded({ extended: false }));
       app.use(cookieParser());
       app.use(express.static(path.join(__dirname, 'public')));
   
       app.use('/', indexRouter);
       app.use('/users', usersRouter);
       app.use('/items', itemsRouter); // Add this line
   
       module.exports = app;
   

5. Start the server by typing npm start and test in browser by visiting http://localhost:3000/items.

   Confirm by navigating to the site