Create a REST API with Node js & Express

 app.js:- 

const express=require("express");

const http=require("http");

require("./db/connection");

const router=require("./api/emp/index")

const employee=require("./api/emp/model");

const app=express();

const server=http.createServer(app);

const port=process.env.PORT || 3000;

const ip=process.env.IP || "localhost";

app.use(express.json())

app.use(router)

server.listen(port, ip, ()=>{

    console.log("Express Server Listening on http://%s:%d", ip, port);

})

---------------------------------

connection.js:

const mongoose = require('mongoose');

mongoose.connect('mongodb://127.0.0.1:27017/EMPDB').then(()=>{

    console.log("MongoDb Connection Sucessfull....");

}).catch((e)=>{

    console.log("Mongodb connection Failed!!!");

})

------------------------------

Model.js:

const mongoose=require("mongoose");

const empSchema=new mongoose.Schema({

    empid:{type:Number, maxlength:2, unique:true, required:true},

    name:{type:String, maxlength:128, required:true},

    gender:{type:String, maxlength:6, required:true},

    mobile:{type:Number, maxlength:11, unique:true, required:true},

    email:{type:String, maxlength:128, unique:true, match:/^\S+@\S+\.\S+$/, required:true},

    doj:{type:String, maxlength:20, match:/^[0-9]{2}[\/][0-9]{2}[\/][0-9]{4}$/, required:true},

})

const employee=new mongoose.model("EmpCollection", empSchema);

module.exports=employee;

----------------------------

index.js:

const express=require("express");

const employee = require("./model");

const router=express.Router();

const {createEmpData, readEmpData, getPerticularEmpData, updateEmpData, deleteEmpData}=require("./controller")

router.post("/apiemployee", createEmpData)

router.get("/apiemployee", readEmpData)

router.get("/apiemployee/:id", getPerticularEmpData)

router.patch("/apiemployee/:id", updateEmpData)

router.delete("/apiemployee/:id", deleteEmpData)

module.exports=router

--------------------------------

controller.js:

const employee=require("./model")

// exports.createEmpData=async(req, res)=>{

//     console.log("Create Employee Data");

//     try {

//         const {empid, name, gender, mobile, email, doj}=req.body

//         const emp=new employee({

//             empid:empid,

//             name:name,

//             gender:gender,

//             mobile:mobile,

//             email:email,

//             doj:doj

//         })

//         const createEmp= await emp.save();

//         res.send(createEmp)

//     } catch (e) {

//         res.send(e)

//     }

// }

exports.createEmpData=async(req, res)=>{

    console.log("Create Employee Data Another Way");

    try {

        const emp=new employee(req.body)

        const createEmp= await emp.save();

        res.status(201).send(createEmp)

    } catch (e) {

        res.status(500).send(e)

    }

}

exports.readEmpData=async(req, res)=>{

    console.log("Read Employee Data");

    try {

        const emp=await employee.find();

        res.status(200).send(emp);

    } catch (e) {

        res.status(500).send(e);

    }

}

exports.getPerticularEmpData=async(req, res)=>{

    console.log("Get Perticular Employee Data");

    try {

        const _id=req.params.id;

        const emp=await employee.findById(_id);

        res.status(200).send(emp);

    } catch (e) {

        res.status(500).send(e);

    }

}

exports.updateEmpData=async(req, res)=>{

    console.log("Update Employee Data");

    try {

        const _id=req.params.id;

        const emp=await employee.findByIdAndUpdate(_id, req.body, {new:true});

        res.status(200).send(emp);

    } catch (e) {

        res.status(500).send(e);

    }

}

exports.deleteEmpData=async(req, res)=>{

    console.log("Delete Employee Data");

    try {

        const _id=req.params.id;

        const emp=await employee.findByIdAndDelete(_id);

        res.status(200).send(emp);

    } catch (e) {

        res.status(500).send(e);

    }

}