How do I impress the interviewer with an OTP input component?
Build the core first (auto-focus, backspace), then add paste support (often forgotten), numeric-only filter, completion detection (enable verify button), CSS with focus styling, and bonus features (arrow keys, error state, resend, accessibility) if time permits.
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More FAQs in OTP Input Interview Tips and Tricks
Paste support. Many candidates build auto-focus and backspace but forget that users copy the OTP from an email or SMS and paste it. Implementing paste support shows attention to detail and real-world thinking.
Arrow key navigation, error state (red border on invalid OTP), resend OTP with a countdown timer, auto-fill from SMS (autocomplete='one-time-code'), and accessibility (aria-label, role, screen reader announcements).
Forgetting paste support, not handling backspace on empty inputs, allowing non-numeric input, no focus styling (CSS), and not testing with keyboard only. Avoid these to score higher.
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