At first, set the characters and numbers −
var storedCharacters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
To generate randomly, use Math.random(). Following is the code −
Example
function generateRandom3Characters(size) { var generatedOutput= ''; var storedCharacters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; var totalCharacterSize = storedCharacters.length; for ( var index = 0; index < size; index++ ) { generatedOutput+=storedCharacters.charAt(Math.floor(Math.random() * totalCharacterSize)); } return generatedOutput; } console.log(generateRandom3Characters(3));
To run the above program, you need to use the following command −
node fileName.js.
Output
Here, my file name is demo136.js. This will produce the following output −
PS C:\Users\Amit\JavaScript-code> node demo136.js lq4