Node.js + Vue.js + Mongo DB - CRUD example - MEVN stack development example

Hello everyone, today we will learn how to build a full-stack application that is a basic User Management Application using Node.js, MongoDB, and Vue.js.GitHub repository link is provided at the end of this tutorial. You can download the source code.

  • Node.js Express exports REST APIs & interacts with MongoDB Database utilizing Mongoose ODM.
  • Vue.js is an open-source, progressive JavaScript framework for building utilizer interfaces. Vue fortifies the component-based approach to building web apps – it includes single-file components that are independent and loosely coupled to enable better code reuse and more expeditious development

After completing this tutorial what we will build? 

We will build a full-stack web application that is a basic User Management Application with CRUD features: 
  • Create User 
  • List User
  • Update User
  • Delete User 

Following is the screenshot of our application -

-Retrieve all Users:


-Add a User:


-Update User:


We divided this tutorial into two parts. 

PART 1 - Rest APIs Development using Node.js and Express
PART 2 - UI development using Vue.js

PART 1 - Rest APIs Development using Node.js and Express

These are APIs that Node.js Express App will export:

  1. GET all User's        :     /api/v1/users
  2. GET User by ID     :     /api/v1/users/{_id}
  3. POST User             :     /api/v1/users 
  4. PUT User               :     /api/v1/users/{_id} 
  5. DELETE User       :     /api/v1/users/{_id}

Back end project structure:


The package.json file 

A package.json is a JSON file that subsists at the root of a Javascript/Node project. It holds metadata pertinent to the project and is utilized for managing the project's dependencies, scripts, version, and a whole lot more.
{
  "name": "node_app",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "nodemon index.ts",
    "seed": "ts-node ./seed/seed.ts",
    "lint": "eslint . --ext .ts"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@types/bcryptjs": "^2.4.2",
    "@types/cors": "^2.8.6",
    "@types/express": "^4.17.6",
    "@types/express-fileupload": "^1.1.5",
    "@types/jsonwebtoken": "^8.5.0",
    "@types/mongoose": "^5.7.20",
    "@types/node": "^14.0.1",
    "@types/properties-reader": "^2.1.0",
    "bcryptjs": "^2.4.3",
    "body-parser": "^1.19.0",
    "chai": "^4.2.0",
    "chai-http": "^4.3.0",
    "confi": "^9.10.1",
    "cors": "^2.8.5",
    "custom-env": "^2.0.1",
    "del": "^6.0.0",
    "dotenv": "^8.2.0",
    "express": "^4.17.1",
    "express-fileupload": "^1.2.0",
    "jsonwebtoken": "^8.5.1",
    "lodash": "^4.17.20",
    "lokijs": "^1.5.11",
    "mocha": "^8.2.1",
    "mongodb": "^3.5.7",
    "mongoose": "^5.9.14",
    "mongoose-seed": "^0.6.0",
    "morgan": "^1.10.0",
    "multer": "^1.4.2",
    "properties-reader": "^2.1.1",
    "ts-node": "^8.10.1",
    "typescript": "^3.9.2"
  },
  "devDependencies": {
    "@typescript-eslint/eslint-plugin": "^4.7.0",
    "@typescript-eslint/parser": "^4.7.0",
    "eslint": "^6.8.0",
    "eslint-config-airbnb-base": "^14.1.0",
    "eslint-plugin-import": "^2.20.2",
    "nodemon": "^2.0.3"
  }
}


The db.ts file

import mongoose = require('mongoose');

import UserDoc = require('./models/user.model')
export const connectionString = 'mongodb://localhost/user-dev';

mongoose.connect(connectionString, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
  useCreateIndex: true,
  useFindAndModify: false,
});

export const models = { UserDoc };


The collection.ts file

const collections = {
  users: 'users'
};

export = collections


The user.model.ts file inside the model package

import mongoose from 'mongoose';
import collections from '../collections';
import { User } from '../interface/user.interface';

const schema = new mongoose.Schema(
  {
    firstName: {
      type: String,
    },
    lastName: {
      type: String
    },
    emailId: {
      type: String,
      unique: true
    }
  },
);

schema.set('toJSON', { virtuals: true });

export = mongoose.model<User>(collections.users, schema);


The user.interface.ts file inside the interface package

import { Document } from 'mongoose';

export interface User extends Document{
    firstName: string;
    lastName: string;
    emailId: string;
    
}


The user.routes.ts file

import { Router, Request, Response } from 'express';
import { updateUser, findById, 
       deleteUserById,saveUserData,getAllUsers } 
               from '../services/user.service';

const router = Router();

router.post('/users', (req: Request, res: Response) => {
  saveUserData(req, res);
});
router.put('/users/:id', (req: Request, res: Response) => {
  updateUser(req, res);
});
router.get('/users', (req: Request, res: Response) => {
  getAllUsers(req, res);
});
router.delete('/users/:id', (req: Request, res: Response) => {
  deleteUserById(req, res);
});
router.get('/users/:id', (req: Request, res: Response) => {
  findById(req, res);
});
export = router


The user.service.ts file

import { Request, Response } from 'express';
import { models } from '../db/db';

const { UserDoc } = models;

//get all user
export async function 
     getAllUsers(request: Request, response: Response): 
                     Promise<Response> {

  try {
    const data = await UserDoc.find();
    console.log(data)
    return response.status(200).send(data);
  } catch (error) {
    console.log(Error)
    return response.status(500).
           send({ message: "Technical Error" });
  }
}

//Save new user
export async function 
        saveUserData(request: Request, response: Response): 
                      Promise<Response> {

  console.log(request.body)
  try {
    const data = new UserDoc(request.body);
    await data.save();
    return response.status(200).send({ data });
  } catch (error) {
    console.log(error)
    return response.status(500).
        send({ message: "Technical Error" });
  }
}

//get user by id
export async function 
         findById(request: Request, response: Response): 
                          Promise<Response> {

  try {
    const data = await UserDoc.findById(request.params.id);
    return response.status(200).send(data);
  } catch (error) {
    console.log(Error)
    return response.status(500).
          send({ message: "Technical Error" });
  }

}

//delete user
export async function 
          deleteUserById(request: Request, response: Response): 
                                 Promise<Response> {

  try {
    console.log(request.params.id)
    const data = await UserDoc.remove({ _id: request.params.id });
    console.log(data)
    return response.status(200).
          send({ data: "Deleted Successfully" });
  } catch (error) {
    console.log(Error)
    return response.status(500).
         send({ message: "Technical Error" });
  }
}

export async function 
       updateUser(request: Request, response: Response): 
                               Promise<Response> {

  try {
    console.log(request.body)
    const data = await UserDoc.
         findOneAndUpdate({ _id: request.params.id },
            request.body, { new: true });
    console.log(data)
    return response.status(200).
        send({ data: "Successfully Updated" });
  } catch (error) {
    console.log(Error)
    return response.status(500).
       send({ message: "Technical Error" });
  }
}


The index.ts file

import express from 'express';
import cors from 'cors';
import bodyParser from 'body-parser';
import user from './routes/user.routes';
const morgan = require('morgan');
const fileUpload = require('express-fileupload');
const fs = require('fs');
//if (process.env.NODE_ENV !== 'production') {
//require('dotenv').config();
//}

const app = express();
app.use(fileUpload({
  createParentPath: true
}));

app.use(morgan('common', {
  stream: fs.createWriteStream('./' + new Date().
               toISOString().substr(0, 10) 
                             + '.log', { flags: 'a' })
}));
app.use(morgan('dev'));
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(cors());
app.use('/api/v1/', user)
app.listen(8081, () => {
  // eslint-disable-next-line no-console
  console.log('App listening on port 8081!');
});


Download the dependencies using the following command

npm install

Run our backend application using the following command

npm start



PART 2 - UI development using Vue.js

Now we are going to develop a Vue.js web application. 

package structure - Front end




The package.json file

{
  "name": "frontend-vuejs",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
    "axios": "^0.18.0",
    "vue": "^2.6.6",
    "vue-router": "^3.0.2"
  },
  "devDependencies": {
    "@vue/cli-plugin-babel": "^3.5.0",
    "@vue/cli-plugin-eslint": "^3.5.0",
    "@vue/cli-service": "^3.5.0",
    "babel-eslint": "^10.0.1",
    "eslint": "^5.8.0",
    "eslint-plugin-vue": "^5.0.0",
    "vue-template-compiler": "^2.5.21"
  },
  "eslintConfig": {
    "root": true,
    "env": {
      "node": true
    },
    "extends": [
      "plugin:vue/essential",
      "eslint:recommended"
    ],
    "rules": {},
    "parserOptions": {
      "parser": "babel-eslint"
    }
  },
  "postcss": {
    "plugins": {
      "autoprefixer": {}
    }
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
}


Components

Vue Components are one of the important features of VueJS that creates custom elements, which can be reused in HTML

User.vue

<template>
  <div>
    <h3>User</h3>
    <div class="container">
      <form @submit="validateAndSubmit">
        <div v-if="errors.length">
          <div
            class="alert alert-danger"
            v-bind:key="index"
            v-for="(error, index) in errors"
          >
            {{ error }}
          </div>
        </div>
        <fieldset class="form-group">
          <label>First Name</label>
          <input type="text" class="form-control" 
                     v-model="firstName" />
        </fieldset>
        <fieldset class="form-group">
          <label>Last Name</label>
          <input type="text" class="form-control" 
                     v-model="lastName" />
        </fieldset>
        <fieldset class="form-group">
          <label>Email Id</label>
          <input type="text" class="form-control" 
                    v-model="emailId" />
        </fieldset>
        <button class="btn btn-success" type="submit">Save</button>
      </form>
    </div>
  </div>
</template>
<script>
import UserDataService from "../service/UserDataService";

export default {
  name: "User",
  data() {
    return {
      firstName: "",
      lastName: "",
      emailId: "",
      errors: [],
    };
  },
  computed: {
    id() {
      return this.$route.params.id;
    },
  },
  methods: {
    refreshUserDetails() {
      UserDataService.retrieveUser(this.id).then((res) => {
        this.firstName = res.data.firstName;
        this.lastName = res.data.lastName;
        this.emailId = res.data.emailId;
      });
    },
    validateAndSubmit(e) {
      e.preventDefault();
      this.errors = [];
      if (!this.firstName) {
        this.errors.push("Enter valid values");
      } else if (this.firstName.length < 5) {
        this.errors.
            push("Enter atleast 5 characters in First Name");
      }
      if (!this.lastName) {
        this.errors.push("Enter valid values");
      } else if (this.lastName.length < 5) {
        this.errors.
            push("Enter atleast 5 characters in Last Name");
      }
      if (this.errors.length === 0) {
        if (this.id == -1) {
          UserDataService.createUser({
            firstName: this.firstName,
            lastName: this.lastName,
            emailId: this.emailId,
          }).then(() => {
            this.$router.push("/users");
          });
        } else {
          UserDataService.updateUser(this.id, {
            id: this.id,
            firstName: this.firstName,
            lastName: this.lastName,
            emailId: this.emailId,
          }).then(() => {
            this.$router.push("/users");
          });
        }
      }
    },
  },
  created() {
    this.refreshUserDetails();
  },
};
</script>


Users.vue

<template>
  <div class="container">
    <h3>All Users</h3>
    <div v-if="message" class="alert alert-success">
              {{ this.message }}</div>
    <div class="container">
      <table class="table">
        <thead>
          <tr>
           
            <th>First Name</th>
            <th>Last Name</th>
            <th>Email Id</th>
            <th>Update</th>
            <th>Delete</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="user in users" v-bind:key="user.id">
          
            <td>{{ user.firstName }}</td>
            <td>{{ user.lastName }}</td>
            <td>{{ user.emailId }}</td>
            <td>
              <button class="btn btn-warning" 
                 v-on:click="updateUser(user.id)">
                  Update
              </button>
            </td>
            <td>
              <button class="btn btn-danger" 
                 v-on:click="deleteUser(user.id)">
                  Delete
              </button>
            </td>
          </tr>
        </tbody>
      </table>
      <div class="row">
        <button class="btn btn-success"
               v-on:click="addUser()">Add</button>
      </div>
    </div>
  </div>
</template>
<script>
import UserDataService from "../service/UserDataService";

export default {
  name: "Users",
  data() {
    return {
      users: [],
      message: "",
    };
  },
  methods: {
    refreshUsers() {
      UserDataService.retrieveAllUsers().then((res) => {
        this.users = res.data;
      });
    },
    addUser() {
      this.$router.push(`/user/-1`);
    },
    updateUser(id) {
      this.$router.push(`/user/${id}`);
    },
    deleteUser(id) {
      UserDataService.deleteUser(id).then(() => {
        this.refreshUsers();
      });
    },
  },
  created() {
    this.refreshUsers();
  },
};
</script>


UserDataService.js

import axios from 'axios'

const USER_API_URL = 'http://localhost:8081/api/v1'

class UserDataService {

    retrieveAllUsers() {

        return axios.get(`${USER_API_URL}/users`);
    }

    retrieveUser(id) {

        return axios.get(`${USER_API_URL}/users/${id}`);
    }

    deleteUser(id) {

        return axios.delete(`${USER_API_URL}/users/${id}`);
    }

    updateUser(id, user) {

        return axios.put(`${USER_API_URL}/users/${id}`, user);
    }

    createUser(user) {

        return axios.post(`${USER_API_URL}/users`, user);
    }   
}

export default new UserDataService()


App.vue

<template>
  <div class="container">
    <div class="navbar-header">
      <a class="navbar-brand" href="#">Node.js + Mongo DB + 
                      Vue.js CRUD Application</a><br/><br/>
    </div>
    <router-view/>
  </div>
</template>

<script>
export default {
  name: "app"
};
</script>

<style>
@import url(https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css);
</style>


routes.js

import Vue from "vue";
import Router from "vue-router";

Vue.use(Router);

const router = new Router({
    mode: 'history',
    routes: [
        {
            path: "/",
            name: "Users",
            component: () => import("./components/Users"),
        },
        {
            path: "/users",
            name: "Users",
            component: () => import("./components/Users"),
        },
        {
            path: "/user/:id",
            name: "User",
            component: () => import("./components/User"),
        },
    ]
});

export default router;


main.js

import Vue from 'vue'
import App from './App.vue'
import router from './routes';

Vue.config.productionTip = false

new Vue({
  router,
  render: h => h(App),
}).$mount('#app')


## Install the dependencies

npm install

### Run the application in local

npm run serve

 App running at:- Local:   http://localhost:8080/ 

Download Source code

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Google Cloud Storage + Spring Boot - File Upload, Download, and Delete

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In this section, we will learn  how to  create a simple spring boot application to perform different file operations such as upload, download, list, and delete files from the Google Cloud Storage. 1.  A little bit of Background Google Cloud Storage Cloud Storage is a managed service for storing unstructured data. Store any amount of data and retrieve it as often as you like. More Info - click here! Spring Boot Spring Boot makes it easy to create stand-alone, production-grade Spring-based Applications that you can "just run".  More Info - click here! 2. Create a GCP Project First, Sign into the Google console at  https://console.cloud.google.com . You can create a new project by first selecting the project dropdown in the top left and selecting " New Project ". Next, specify your GCP  Project name  and  Project ID . Then  Click on the " CREATE " button. Copy " Project ID " and keep it for future purposes. 3. Create a Google Cloud Storage bucket Fr
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