Password Strength Checker

Security-focused password strength analysis for Node.js and TypeScript.

Install

npm install @trallerds/password-strength-checker

Usage

import { checkPassword } from "@trallerds/password-strength-checker";

const result = await checkPassword("MinhaSenha123!");

console.log(result.level); // "WEAK"
console.log(result.score); // 42
console.log(result.issues); // [...]
console.log(result.recommendations); // [...]

Response

{
  score: number;
  level: "VERY_WEAK" | "WEAK" | "FAIR" | "STRONG" | "VERY_STRONG";
  entropyBits: number;
  estimatedGuesses: number;
  compromised: boolean;
  issues: Array<{
    type: string;
    severity: "critical" | "high" | "medium" | "low" | "info";
    message: string;
  }>;
  recommendations: string[];
}

API

checkPassword(password: string): Promise<PasswordAnalysis>

Runs the full analysis pipeline:

• Length analysis
• Character set variety
• Repetition detection
• Sequential character detection
• Keyboard pattern detection
• Dictionary / common password detection
• Date and year pattern detection
• Breach detection

Server

npm run dev

Then:

curl -X POST http://localhost:3000/password/strength \
  -H "Content-Type: application/json" \
  -d '{"password":"P@ssword2026!"}'

License

ISC