Password Strength Checker

Password Strength Checker is a lightweight JavaScript library for evaluating the strength of passwords based on various criteria such as length, presence of lowercase and uppercase letters, numbers, and symbols.

Installation

Install the package via npm:

npm install password-strength-checker

Usage

Instantiate the PasswordStrengthChecker class and use the checkStrength() method to evaluate the strength of a password:

const PasswordStrengthChecker = require('./password-strength-checker');

// Instantiate the PasswordStrengthChecker
const passwordChecker = new PasswordStrengthChecker();

// Check password strength
const password = 'StrongPassword123!';
const strength = passwordChecker.checkStrength(password);

console.log(`Password strength: ${strength}/5`);

Configuration

By default, the following criteria are used for evaluating password strength:

Minimum length: 8 characters Minimum number of lowercase letters: 1 Minimum number of uppercase letters: 1 Minimum number of digits: 1 Minimum number of special characters: 1 You can customize these criteria by modifying the properties of the PasswordStrengthChecker class instance.

API

checkStrength(password)

Evaluates the strength of the given password and returns a score between 0 and 5, where 0 indicates very weak and 5 indicates very strong.

• password: (string): The password to be evaluated.

License

This README provides installation instructions, usage examples, configuration options, API documentation, and licensing information. It's ready to be included in the package repository.