Generate random string/characters in JavaScript?

To generate random string/ characters in JavaScript, use Math.random(). We are generating 6 random characters here from the following characters −

'ABCDEFGHIJKLMNOabcdefghijklmnopqrstuvwxyzPQRSTUVWXYZ';

Example

Following is the code −

function generateRandomNumber(numberOfCharacters) {
   var randomValues = '';
   var stringValues = 'ABCDEFGHIJKLMNOabcdefghijklmnopqrstuvwxyzPQRSTUVWXYZ';  
   var sizeOfCharacter = stringValues.length;  
for (var i = 0; i < numberOfCharacters; i++) {
      randomValues = randomValues+stringValues.charAt(Math.floor(Math.random() * sizeOfCharacter));
   }
   return randomValues;
} 
console.log(generateRandomNumber(6));

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo270.js.

Output

This will produce the following output on console −

PS C:\Users\Amit\javascript-code> node demo270.js
qIcoCT