Building a Password Strength Meter in Angular 17

Building a Password Strength Meter in Angular 17

Implementing a password strength meter in Angular 17 is a valuable addition to any web application that requires user authentication. This tutorial will guide you through a detailed step-by-step process to create a password strength meter using Angular 17 and the zxcvbn library.

Step 1: Set Up Your Angular 17 Environment

First, ensure you have Node.js and npm installed on your system. Then, install the Angular 17 CLI globally by running the following command in your terminal:

npm install -g @angular/cli

Step 2: Create a New Angular 17 Project

Open your terminal and create a new Angular 17 project by running the following command:

ng new password-strength-meter
cd password-strength-meter

Step 3: Install zxcvbn

Next, install the zxcvbn library, which we'll use to calculate password strength. Run the following command in your project directory:

npm install zxcvbn

Step 4: Generate a Password Strength Component

Use the Angular 17 CLI to generate a new component for the password strength meter:

ng generate component password-strength

Step 5: Implement Password Strength Logic

Navigate to the newly created password-strength.component.ts file in your password-strength component directory. Add the following code to calculate the password strength:

import { Component, Input } from '@angular/core';
import * as zxcvbn from 'zxcvbn';

  selector: 'app-password-strength',
  templateUrl: './password-strength.component.html',
  styleUrls: ['./password-strength.component.css']
export class PasswordStrengthComponent {
  @Input() password: string = '';

  getPasswordStrength(): number {
    const result = zxcvbn(this.password);
    return result.score;

Step 6: Create the Password Strength Template

Open the password-strength.component.html file and add the following code:

<div [ngClass]="{ 'weak': getPasswordStrength() < 3, 'strong': getPasswordStrength() >= 3 }">
  <div class="strength-meter" [style.width]="getPasswordStrength() * 25 + '%'"></div>

Step 7: Style the Password Strength Meter

Open the password-strength.component.css file and add the following styles:

.strength-meter {
  height: 10px;
  background-color: #ddd;

.weak .strength-meter {
  background-color: #ff6961; /* Red for weak passwords */

.strong .strength-meter {
  background-color: #77dd77; /* Green for strong passwords */

Step 8: Use the Password Strength Component

Now, you can use the app-password-strength component in any other component by passing the password as an input.

Example Usage:

<app-password-strength [password]="userPassword"></app-password-strength>


Congratulations! You've successfully implemented a password strength meter in your Angular 17 application using the zxcvbn library. This feature enhances the security of your application by providing users with feedback on the strength of their passwords. Feel free to customize the styling and further enhance the functionality based on your application's requirements.