Angular 5 CRUD Operation Using Node, Express, MongoDB

In this article, we’ll learn to create basic CRUD application using Angular 5, Nodejs, Express and MongoDB NoSQL database.

Introduction

We will create a demo project using Angular CLI for front-end, Node.js and Express for middle-end, and MongoDB for the back-end. In this article, we start from the beginning.

Requirement

• Visual Studio Code or any IDM for development.
• Node.js - if you already installed node, then check with node –v command and also check the npm command.
• MongoDB - In this project, we are using MongoDB database; you can also use SQL or other database.

If you already installed Angular CLI, globally check the version with this command ng -v

Download links

• Node - https://nodejs.org/en/download/
• VS code - https://code.visualstudio.com/
• MongoDB https://www.mongodb.com/download-center

Let’s start and create demo application.

Step 1

Create a new folder with any name, let's say, AngularCRUD. After the folder is created, then press ctrl+shift Right click for opening the command window here.

 

 

Step 2

After the folder opens in the command prompt, run this command for Angular CLI to install in our folder.

npm install -g @angular/cli

Step 3

If installed successfully, then run this command for creating a new application. Let's again set the project name as AngularCRUD.

ng new projectname

 

 

Step 4

When the ng new command is created and installed successfully, change your directory

cd AngularCRUD.

Step 5

Now, we open our project in Visual Studio code with code command like this.

 

Now, we can see VSCode opened automatically.



Step 6

Now run your application by using this command -

 

ng server - o

 

Here, -o stands for opening application in default browser.

 

Step 7

Now, let us install Express and Mongoose body parser using this command.

• npm install express --save
• npm install mongoose -- save
• npm install body-parser --save

 

Step 8

After installing the above three packages, create a new file, server.js.

var express = require('express');
var path = require("path");
var bodyParser = require('body-parser');
var mongo = require("mongoose");

var db = mongo.connect("mongodb://localhost:27017/AngularCRUD", function(err, response){
   if(err){ console.log( err); }
   else{ console.log('Connected to ' + db, ' + ', response); }
});


var app = express()
app.use(bodyParser());
app.use(bodyParser.json({limit:'5mb'}));
app.use(bodyParser.urlencoded({extended:true}));


app.use(function (req, res, next) {
     res.setHeader('Access-Control-Allow-Origin', 'http://localhost:4200');
     res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
     res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');
     res.setHeader('Access-Control-Allow-Credentials', true);
     next();
 });

 var Schema = mongo.Schema;

var UsersSchema = new Schema({
 name: { type: String   },
 address: { type: String   },
},{ versionKey: false });


var model = mongo.model('users', UsersSchema, 'users');

app.post("/api/SaveUser",function(req,res){
 var mod = new model(req.body);
 if(req.body.mode =="Save")
 {
    mod.save(function(err,data){
      if(err){
         res.send(err);
      }
      else{
          res.send({data:"Record has been Inserted..!!"});
      }
 });
}
else
{
 model.findByIdAndUpdate(req.body.id, { name: req.body.name, address: req.body.address},
   function(err,data) {
   if (err) {
   res.send(err);
   }
   else{
          res.send({data:"Record has been Updated..!!"});
     }
 });


}
 })

 app.post("/api/deleteUser",function(req,res){
    model.remove({ _id: req.body.id }, function(err) {
     if(err){
         res.send(err);
     }
     else{
            res.send({data:"Record has been Deleted..!!"});
        }
 });
   })



 app.get("/api/getUser",function(req,res){
    model.find({},function(err,data){
              if(err){
                  res.send(err);
              }
              else{
                  res.send(data);
                  }
          });
  })


app.listen(8080, function () {

 console.log('Example app listening on port 8080!')
})

Step 9

Let us open the project folder in other command prompt and run the node server.js on port 8080.

 

Setp 10

Create a new Angular Service for common AJAX API calling. Use thie commond 

ng g s common –spec=false

 

 

Step 11

Write the following code in common.service.ts for API.

import { Injectable } from '@angular/core';
import {Http,Response, Headers, RequestOptions } from '@angular/http';

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/do';

@Injectable()
export class CommonService {

  constructor(private http: Http) { }

  saveUser(user){
    return this.http.post('http://localhost:8080/api/SaveUser/', user)
            .map((response: Response) =>response.json())
  }

  GetUser(){
    return this.http.get('http://localhost:8080/api/getUser/')
            .map((response: Response) => response.json())
  }
 deleteUser(id){
    return this.http.post('http://localhost:8080/api/deleteUser/',{'id': id})
            .map((response: Response) =>response.json())
  }

}

Step 12

Now, write the View code in app.module.ts file.

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { HttpModule } from '@angular/http';
import { FormsModule } from '@angular/forms';

import { AppComponent } from './app.component';

import {CommonService} from './common.service';


@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,HttpModule,FormsModule,
  ],
  providers: [CommonService],
  bootstrap: [AppComponent]
})
export class AppModule { }

Step 13

Code for app.component.html.

<form #userForm="ngForm"   (ngSubmit)="onSave(userForm.value)" novalidate>
  <p>Is "myForm" valid? {{userForm.valid}}</p>
 <table border='1'>
<tr>
<td>name</td>
<td>
    <input name="id" type="hidden"     [(ngModel)]="id" />
     <input name="name" type="text"  required  [(ngModel)]="name" />

 </td>
</tr>

<tr>
    <td>address</td>
    <td>    <input name="address" required  type="text"   [(ngModel)]="address" /></td>
    </tr>
    <tr>
        <td colspan="2">
    <input type="submit" value="{{valbutton}}" />
    </td>
    </tr>
 </table>
</form>

<table border='1'>

  <tr>
    <td>Id</td>
    <td>Name</td>
    <td>Address</td>
    <td>Edit</td>
    <td>Delete</td>
  </tr>
  <tr *ngFor="let kk of Repdata;let ind = index">

    <td>{{ind + 1}}</td>
    <td>{{kk.name}}</td>
    <td>{{kk.address}}</td>
    <td><a (click)="edit(kk)" style="color:blueviolet">Edit</a></td>
    <td><a (click)="delete(kk._id)" style="color:blueviolet">Delete</a>  </td>
  </tr>
</table>

Step 14 

Write this code in app.component.ts and remove the existing code from this file.

import { Component, OnInit } from '@angular/core';
import {FormGroup,FormControl,Validators,FormsModule, } from '@angular/forms';
import {CommonService} from './common.service';

import {Http,Response, Headers, RequestOptions } from '@angular/http';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {


  constructor(private newService :CommonService,) {   }
   Repdata;
   valbutton ="Save";


ngOnInit() {
  this.newService.GetUser().subscribe(data =>  this.Repdata = data)
}

onSave = function(user,isValid: boolean) {
 user.mode= this.valbutton;
  this.newService.saveUser(user)
  .subscribe(data =>  {  alert(data.data);

    this.ngOnInit();
  }
  , error => this.errorMessage = error )

}
edit = function(kk) {
this.id = kk._id;
this.name= kk.name;
this.address= kk.address;
this.valbutton ="Update";
}

delete = function(id) {
this.newService.deleteUser(id)
.subscribe(data =>   { alert(data.data) ; this.ngOnInit();}, error => this.errorMessage = error )
}

}

We are almost done for performing select, insert, update, delete operation. Now, let us run two servers. The first one is Angular application with command  ng server-o and the second one is to open node.js server.

 

 

We seen the output on borwser port 4200.

 

Summary

In this article, we learned how to create CRUD application with Angular 5 and node. I hope you enjoyed this article. If you have any query related to this code, please comment in the comments section.