otplib API Documentation / @otplib/core / utils / truncateDigits
Function: truncateDigits()
truncateDigits(
value,digits):string
Defined in: packages/core/src/utils.ts:714
Convert truncated integer to OTP string with specified digits
Computes: Snum mod 10^Digit (RFC 4226 Section 5.3)
The result is zero-padded to ensure consistent length, as required for proper token comparison.
Parameters
value
number
The truncated integer value (Snum)
digits
number
Number of digits for the OTP (Digit, typically 6-8)
Returns
string
OTP string with leading zeros if necessary