<div class="card-input-wrapper">
  <label>Card Number</label>
  <div class="input-box">
    <svg viewBox="0 0 24 24" width="24" height="24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="1" y="4" width="22" height="16" rx="2" ry="2"></rect><line x1="1" y1="10" x2="23" y2="10"></line></svg>
    <input type="text" id="ccInput" placeholder="0000 0000 0000 0000" maxlength="19">
  </div>
</div>

.card-input-wrapper {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  max-width: 350px;
  margin: 0 auto;
}
label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #374151;
}
.input-box {
  position: relative;
  display: flex;
  align-items: center;
}
.input-box svg {
  position: absolute;
  left: 12px;
  color: #9ca3af;
}
input {
  width: 100%;
  padding: 12px 12px 12px 45px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 1.1rem;
  font-family: monospace;
  outline: none;
  transition: border-color 0.2s;
  box-sizing: border-box;
}
input:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

const ccInput = document.getElementById("ccInput");

ccInput.addEventListener("input", function(e) {
  // Remove all non-digits
  let value = e.target.value.replace(/\D/g, "");
  
  // Add space every 4 digits
  value = value.replace(/(\d{4})(?=\d)/g, "$1 ");
  
  e.target.value = value;
});

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Credit Card Number Formatter JS

Improve your checkout form with auto-formatting. This script automatically adds spaces after every four digits as the user types their card number, which makes it much easier to read and prevents errors.

349

#javascript

#css

#form

#credit card

#input

#formatting

#payment

#ui

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Credit Card Number Formatter JS

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