otplib API Documentation / @otplib/core / utils / validateCounter

Function: validateCounter()

validateCounter(counter, guardrails?): void

Defined in: packages/core/src/utils.ts:483

Validate counter value

Parameters

counter

number | bigint

The counter to validate

guardrails?

OTPGuardrails = DEFAULT_GUARDRAILS

Validation guardrails (defaults to RFC recommendations)

Returns

void

Throws

If counter is negative

Throws

If counter exceeds safe integer