MVCS architecture in node & express
Sri Praveen
![Sri Praveen]()
Sri Praveen
React | Nodejs, MERN FSD | JAVA SPRING BOOT | USA | Singapore | Indonesia | India | Software Architect | Corporate Trainer | Project Consultant
Model view controller Service
Model To define the ORM.View Represents how the data will show in the page Controller processing the request and response.
Service can have business logic & implemented here
So let's see how to implement MVCS in Node & Express.
Project directory structure
Here I am using sequelize as ORM.
Main.js is the initial loading file for our application
//main.js
var exp = require('express')
var app = exp();
var api = require('./api');
app.use(exp.json());
app.use('/api',api);
app.use('/web',web);
app.listen(8080,()=>{
console.log("server started..");
})
Recommended by LinkedIn
Below model is the ORM of our user table. Here we are using sequelize.
//UserModel.js
const { DataTypes } = require('sequelize');
const {sequelizeObj} = require("../config/DbCon");
const UserModel = sequelizeObj.define('user', {
// Model attributes are defined here
name: {
type: DataTypes.STRING,
allowNull: false
},
email: {
type: DataTypes.STRING
// allowNull defaults to true
},
password: {
type: DataTypes.STRING
// allowNull defaults to true
}
});
module.exports = { UserModel }
Our business logic will be implemented in this service.
//UserService.js
const { UserModel } = require('../model/UserModel');
const {sequelizeObj} = require("../config/DbCon");
class UserService{
async getAllData(){
await sequelizeObj.sync();
let userDbData = await UserModel.findAll();
return userDbData;
}
async login(uname,pwd){
await sequelizeObj.sync();
console.log(uname,pwd);
let userDbData = await UserModel.findOne({where:{"email":uname,"password":pwd}});
if(userDbData == null){
throw 'NO USER FOUND';
}
return userDbData.dataValues;
}
async register(){
await sequelizeObj.sync();
await UserModel.create({
"name":"tesrt",
"email":"test@gmail.com",
"password":"test"
})
}
}
module.exports ={ UserService};
//api.js
var exp = require('express');
const { UserService } = require('./Service/UserService');
var router = exp.Router();
let userService = new UserService();
router.get('/getAll',async (req,res)=>{
let dbData = await userService.getAllData();
res.json(dbData);
})
router.post('/login',async (req,res)=>{
try{
let uname = req['body']['name'];
let pwd = req['body']['pwd']
let dbData = await userService.login(uname,pwd);
res.json(dbData);
}catch(e){
res.status(400);
res.json({"Error":"Error "+e})
}
})
router.post('/register',async (req,res)=>{
try{
await userService.register();
res.json({"message":"data inserted"});
}catch(e){
res.status(400);
res.json({"Error":"Error "+e})
}
})
module.exports=router;
node main.js will run our app successfully.