random.js

// generate random string
const generateString = 
      (length, chars) => Array(length)
		.fill('')
		.map((v) => chars[Math.floor(Math.random() * chars.length)])
		.join('');

// Example
generateString(10, '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ');

// generate random IP
const randomIp = () => Array(4)
	.fill(0)
	.map((_, i) => Math.floor(Math.random() * 255) + (i === 0 ? 1 : 0))
	.join('.');

// Example
randomIp();