Express Router

ExpressRouter.js

const express = require('express')
//app is an instance of express.
const app = express();

//Middleware function --> converts data coming from frontend to json
app.use(express.json())
app.listen(3000);

let users = [
    {
        id:1,
        name: "User1"
    },
    {
        id:2,
        name:"User2"
    },
    {
        id:3,
        name:"User3"
    }
];

const userRouter = express.Router();

//base Route, RouterToUse
app.use('/user', userRouter);

userRouter
.route('/')
.get(getUser)
.post(postUser)
.patch(updateUser)
.delete(deleteUser)

userRouter
.route('/:id')
.get(getUserById);

//Now writing these functions
function getUser(req, res){
  res.send(users);
}

function postUser(req, res){
  users = req.body;
    res.json({
        message:"data received",
        user:req.body,
   })
}

function updateUser(req, res){
    for(key in req.body){
        console.log("key", key);
        console.log("users[key]", users[req.body[key]])
        console.log("req.body[key]", req.body[key])
        users[req.body[key]] = req.body[key]
    }
    res.json({
        message:"data updated!!"
    })
}

function deleteUser(req, res){
    users={};
    res.json({
        message:"deleted successfully!"
    })
}

function getUserById(req, res){
  console.log(req.params.id);
    let paramId = req.params.id;
    let obj = {};
    for(let i = 0; i < users.length; i++){
        if(users[i]['id'] == paramId){
            obj = users[i];
        }
    }
    res.json({
        message:"req received",
        data:obj
    })
}