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JavaScript Password Strength Indicator

Provide real-time feedback on password strength as a user types. Checks for length, numbers, uppercase, and special characters.

326

#javascript

#password

#strength indicator

#security

#form

#input validation

/HTML *CSS ()JS Output Live Updates

:root {
  --bg-soft: #f8fafc;
  --border-color: #e2e8f0;
  --primary-accent: #6366f1;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  box-sizing: border-box;
}

.input-group {
  max-width: 320px;
  margin: 2rem auto;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
}

.password-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

#password {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: 12px;
  font-size: 1rem;
  transition: var(--transition);
  outline: none;
}

#password:focus {
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

#togglePassword {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  opacity: 0.6;
}

/* Strength Meter */
#strengthIndicator {
  margin-top: 12px;
}

.bar-container {
  height: 6px;
  background: var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 8px;
}

#strengthBar {
  height: 100%;
  width: 0%;
  border-radius: 10px;
  transition: width 0.5s ease, background-color 0.3s ease;
}

.status-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 500;
}

#strengthText { color: var(--text-muted); }

const password = document.getElementById('password');
const bar = document.getElementById('strengthBar');
const text = document.getElementById('strengthText');
const toggleBtn = document.getElementById('togglePassword');

// Toggle Visibility
toggleBtn.addEventListener('click', () => {
  const type = password.getAttribute('type') === 'password' ? 'text' : 'password';
  password.setAttribute('type', type);
});

// Strength Logic
password.addEventListener('input', () => {
  const val = password.value;
  let score = 0;

if (val.length > 6) score++;
  if (/[A-Z]/.test(val)) score++;
  if (/[0-9]/.test(val)) score++;
  if (/[^A-Za-z0-9]/.test(val)) score++;

const config = [
    { width: '5%', color: '#cbd5e1', label: 'Very Weak' },
    { width: '25%', color: '#ef4444', label: 'Weak' },
    { width: '50%', color: '#f59e0b', label: 'Fair' },
    { width: '75%', color: '#3b82f6', label: 'Good' },
    { width: '100%', color: '#10b981', label: 'Strong' }
  ];

const result = val.length === 0 ? { width: '0%', color: '#e2e8f0', label: 'Enter password' } : config[score];

bar.style.width = result.width;
  bar.style.backgroundColor = result.color;
  text.innerText = result.label;
  text.style.color = val.length === 0 ? '#64748b' : result.color;
});

JavaScript Password Strength Indicator

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