Password Strength Meter For Angular 15

To display the strength of the password with a visual feedback.

Password Strength Meter use zxcvbn to estimate the strength of the password and also provide a visual feedback with suggestions and warning messages.

This lib was developed based on the following tutorial.

How then is password strength measured? Dropbox developed an algorithm for a realistic password strength estimator inspired by password crackers. This algorithm is packaged in a Javascript library called zxcvbn. In addition, the package contains a dictionary of commonly used English words, names and passwords.

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Demo

See Demo Here

<password-strength-meter [password]="password"></password-strength-meter>

Get Started

Step 1: npm install

npm install @zxcvbn-ts/core @zxcvbn-ts/language-en angular-password-strength-meter --save

Step 2: Import Password Strength Meter Module into your app module

....
import { PasswordStrengthMeterModule } from 'angular-password-strength-meter';

....

@NgModule({
    ...
    imports: [
        ....
        PasswordStrengthMeterModule.forRoot()
    ],
    ....
})
export class AppModule { }

Step 3: use the password-strength-meter component in your app.component.ts

  <password-strength-meter [password]="password"></password-strength-meter>

Use custom zxcvbn options for the password strength meter

You can override the default zxcvbn options by providing the PSM_CONFIG.

Refer to the zxcvbn documentation for more information.

....
import { PasswordStrengthMeterModule, PSM_CONFIG } from 'angular-password-strength-meter';
import zxcvbnCommonPackage from '@zxcvbn-ts/language-common'
import zxcvbnEnPackage from '@zxcvbn-ts/language-en'

....

@NgModule({
    ...
    imports: [
        ....
        PasswordStrengthMeterModule.forRoot()
    ],
    providers: [
      {
        provide: PSM_CONFIG,
        useValue: {
          translations: zxcvbnEnPackage.translations,
          graphs: zxcvbnCommonPackage.adjacencyGraphs,
          dictionary: {
            ...zxcvbnCommonPackage.dictionary,
            ...zxcvbnEnPackage.dictionary,
          },
        }
      }
    ],
    ....
})
export class AppModule { }

Use custom password strength meter service

You can override the default password strength meter service by providing the Custom Service class as follows.

....
import { Injectable } from '@angular/core';
import { IPasswordStrengthMeterService } from 'angular-password-strength-meter';

@Injectable()
export class CustomPsmServiceService extends IPasswordStrengthMeterService {
  score(password: string): number {
    // TODO - return score 0 - 4 based on password
    return 1;
  }

  scoreWithFeedback(password: string): {
    score: number;
    feedback: { warning: string; suggestions: string[] };
  } {
    // TODO - return score with feedback
    return { score: 1, feedback: { warning: '', suggestions: [] } };
  }
}
....

import { PasswordStrengthMeterModule } from 'angular-password-strength-meter';
import { CustomPsmServiceService } from './custom-psm-service.service';


@NgModule({
    ...
    imports: [
        ....
        PasswordStrengthMeterModule.forRoot({ serviceClass: CustomPsmServiceService })
    ],
    ....
})
export class AppModule { }

API

option	bind	type	default	description
password	Input()	string	-	password to calculate its strength
minPasswordLength	Input()	number	8	min length of password to calculate the strength
enableFeedback	Input()	boolean	false	to show/hide the suggestions and warning messages
numberOfProgressBarItems	Input()	number	5	change the number to update the number of progress bar items
colors	Input()	string[]	['darkred', 'orangered', 'orange', 'yellowgreen', 'green']	to overide the meter colors, password strength range is 0 - 4, for strength 0 equals first color in the array and so on. Note - length of the colors array should match the number of progress bar items
strengthChange	Output()	number	-	emits the strength of the provided password in number -> range 0 - 4