om-password-strength-checker/index.js

A simple password strength checker utility

function checkPasswordStrength(password) {
  let score = 0;

  if (!password || typeof password !== "string") {
    return { score, verdict: "Invalid password" };
  }

  if (password.length >= 8) score++;
  if (password.length >= 12) score++;

  if (/[a-z]/.test(password)) score++;
  if (/[A-Z]/.test(password)) score++;
  if (/[0-9]/.test(password)) score++;
  if (/[^a-zA-Z0-9]/.test(password)) score++;

  let verdict = "";

  if (score <= 2) verdict = "Weak";
  else if (score <= 4) verdict = "Moderate";
  else if (score === 5) verdict = "Strong";
  else if (score >= 6) verdict = "Very Strong";

  return { score, verdict };
}

module.exports = { checkPasswordStrength };

// Test (only run when file is executed directly)
if (require.main === module) {
  const result = checkPasswordStrength("Om@12345");
  console.log(result);
}