Angular 5 Cookies - Check, Get, GetAll, Delete and DeleteAll Methods

The cookie based authentication has been the default and the cookie based authentication is stateful.

Stateful – keep and track of the previously stored information which is used for current transaction.

A Stateful service based on HTTP Cookies uses the HTTP transport protocol and its ability to convey cookies, used as session context.

Cookies Methods -

Check (name: string): Boolean;

//Check Cookies

const IsCookieExists: boolean = this.cookieService.check('cookieApp');

Get (name: string): string;

    //Get Cookies

    this.cookieValue = this.cookieService.get('cookieApp');

getAll(): {};

    //Get all cookies

    const allCookies: {} = this.cookieService.getAll();

Delete (name: string, path?: string, domain?: string ): void;

    //delete cookies

    this.cookieService.delete('cookieApp');

deleteAll ( path?: string, domain?: string ): void;

    //delete all cookies

    this.cookieService.deleteAll();

Example for Cookies methods–

Steps 1- Install cookies in your project using below command –

In the above, “D:\Angular\ServiceDemo>” is my project directory and ServiceDemo is my project name.

Steps 2 - Import “ngx-cookie-service” in your “app.module.ts” and its looks like –

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

import { NgModule } from '@angular/core';

import {RouterModule} from '@angular/router';

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

import { FormsModule, ReactiveFormsModule } from '@angular/forms';

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

import {DateServiceService}  from '../app/date-service.service';

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

import { UserComponent } from './user/user.component';

import { BillComponent } from './bill/bill.component';

import {BillService}  from '../app/bill.service';

import { CookieService } from 'ngx-cookie-service';

@NgModule({

  declarations: [

    AppComponent,

    UserComponent,

    BillComponent

  ],

  imports: [

    BrowserModule,

    HttpModule,

    FormsModule,

    ReactiveFormsModule,

    RouterModule.forRoot([

      {

        path:'app-user', component : UserComponent

      },

      {

        path:'app-bill', component : BillComponent

      }

    ])

  ],

  providers: [DateServiceService, BillService, CookieService],

    bootstrap: [AppComponent]

})

export class AppModule { }

Steps 3 – Import “CookieService” in your “app.component.ts” and its looks like

import { Component } from '@angular/core';

import {DateServiceService} from '../app/date-service.service';

import { CookieService } from 'ngx-cookie-service';

@Component({

  selector: 'app-root',

  templateUrl: './app.component.html',

  styleUrls: ['./app.component.css']

})

export class AppComponent {

  title = 'Angular App';

  todayDate;

  cookieValue = 'Anil Singh';

  constructor(private dateService : DateServiceService,

                    private cookieService: CookieService){

    this.todayDate = dateService.getTodayDate();

  }

  ngOnInit(): void {

    //Set cookies

    this.cookieService.set('cookieApp', 'Welcome you, Anil!' );

    //Get Cookies

    this.cookieValue = this.cookieService.get('cookieApp');

    // //Check Cookies

    // const IsCookieExists: boolean = this.cookieService.check('cookieApp');

    // //Get Cookies

    // const value: string = this.cookieService.get('cookieApp');

    // //Get all cookies

    // const allCookies: {} = this.cookieService.getAll();

    // //delete cookies

    // this.cookieService.delete('cookieApp');

    // //delete all cookies

    // this.cookieService.deleteAll();

  }

}

Cookies Limitations –

We can only store around 20 cookies per web server and not more than 4KB of information in each cookie and they can last indefinitely should you choose to specify the max-age attribute.

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