Question

How to assign a random number using a cryptographically secure random number generator in JavaScript

Answer 1

// Generate a cryptographically secure random number
const array = new Uint32Array(1); // Create an array to hold the random value
crypto.getRandomValues(array); // Fill the array with a secure random value

const randomNumber = array[0]; 
console.log(randomNumber);



/*
run:

Random Number: 2089555610

*/

 

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Answer 2

// Generate a random number between min (inclusive) and max (exclusive)
function getSecureRandomInRange(min, max) {
  const array = new Uint32Array(1);
  crypto.getRandomValues(array);
  
  const randomValue = array[0] / (0xFFFFFFFF + 1); // Normalize to [0, 1)
  
  return Math.floor(randomValue * (max - min) + min);
}

const randomInRange = getSecureRandomInRange(1, 100); // between 1 and 100
console.log(randomInRange);



/*
run:

83

*/

 

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