The answer
Send the OTP to the server via fetch: POST /api/verify-otp with { otp }. On success, show a success message and redirect. On failure, show an error, clear inputs, and focus the first input for retry.
OTP Input Validation and Error Handling
How do you handle server-side OTP verification in JavaScript?
More FAQs in OTP Input Validation and Error Handling
Filter non-numeric characters on input (replace(/\D/g, '')). Check completion (all inputs filled). Send the OTP to the server for verification. Show errors for invalid OTP. Clear inputs on error and focus the first one for retry.
Show an error message below the inputs. Add a red border to the inputs (CSS class 'error'). Clear the inputs and focus the first one for retry. Clear errors when the user starts typing again.
Join all input values: Array.from(inputs).map(input => input.value).join(''). This gives a string like '1234' from 4 separate inputs.
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