Random Number Gen

function generateOTP()
{

var digits = '0123456789';

var otpLength = 8;

var otp = '';

for(let i=1; i<=otpLength; i++)

{

    var index = Math.floor(Math.random()*(digits.length));

    otp = otp + digits[index];

}

return otp;

}
console.log( generateOTP() );