Build Your Own API using node and express

npm init -y

npm install --save express

 "name": "crud_api",  "version": "1.0.0",  "description": "",  "main": "index.js",  "type": "module", // this line 

import express from "express";// can also write const express = require ('express');import bodyParser from "body-parser";// bodyParser allows us to take incoming post request bodiesconst app =express();// Now our whole application lies in this little variableconst PORT = 4000;// specifying port of our application , you can choose any port app.use(bodyParser.json)//it says we are going to use json data in our bodyapp.listen(PORT, () =>console.log(`Server running on port: http://localhost:${PORT}`)); //To listen to this port and a callback function 

 npm install --save -dev nodemon

"scripts": {    "test": "echo \"Error: no test specified\" && exit 1",    "start": "nodemon index.js"  },

let users =[]; // an empty array that is the data // THIS IS GET OPERATION//request and response are the parameters passed in this functionexport const getUser=(req,res) =>{// printing the users     console.log(`Users in database: ${users}`);    res.send(users);// sending data from server to client }

npm i uuid

export const createUser = (req, res) => {       const user = req.body;   //In the below statement we are spreding the already users object and adding id as well      users.push({...user, id: uuid()});    console.log(`User [${user.username}] added to the database.`);};

//THIS IS GET A PARTICULAR USER WITH A IDexport const getUser = (req, res) => {    res.send(req.params.id)};

// FOR deleting a particular userexport const deleteUser = (req, res) => {     console.log(`user with id ${req.params.id} has been deleted`);    users = users.filter((user) => user.id !== req.params.id);};

//Update a particular userexport const updateUser =  (req,res) => {    const user = users.find((user) => user.id === req.params.id);    user.username = req.body.username;    user.age = req.body.age;    console.log(`username has been updated to ${req.body.username}.age has been updated to ${req.body.age}`)};

import express from 'express';import {createUser, getUsers, getUser, deleteUser, updateUser} from '../Controllers/users.js'const router = express.Router();router.get('/',getUsers);router.post('/',createUser);router.get('/:id',getUser);router.delete('/:id',deleteUser);router.patch('/:id',updateUser);export default router;

import express from "express";//  can also write const express = require ('express');import bodyParser from "body-parser";// bodyParser allows us to take incoming post request bodiesimport usersRoutes from "./routes/routes.js"const app =express();// Now our whole appliaction lies in this little variableconst PORT = 5000;// specifying port of our aplication , you can choose any port app.use(bodyParser.json)//it says we are going to use json data in our bodyapp.use("/users", usersRoutes);app.get("/", (req, res) => res.send("Welcome to the Users API!"));app.all("*", (req, res) =>res.send("You've tried reaching a route that doesn't exist."));app.listen(PORT, () =>console.log(`Server running on port: http://localhost:${PORT}`)); //To listen to this port and a callback function