client.js

const { default: axios } = require('axios');
const num = Number(process.argv[2]);
for (let i = 0; i < num; i++) {
  setTimeout(() => axios.get('http://localhost:3000'), Math.floor(Math.random() * 200));
}

output

Expected: 0, Actual: 0
Expected: 1, Actual: 1
Expected: 2, Actual: 1
Expected: 3, Actual: 1
Expected: 4, Actual: 1
Expected: 5, Actual: 1
Expected: 6, Actual: 6
Expected: 7, Actual: 6
Expected: 8, Actual: 6
Expected: 9, Actual: 6
Expected: 10, Actual: 6
Expected: 11, Actual: 6
Expected: 12, Actual: 6
Expected: 13, Actual: 6
Expected: 14, Actual: 6
Expected: 15, Actual: 6
Expected: 16, Actual: 6
Expected: 17, Actual: 6
Expected: 18, Actual: 6
Expected: 19, Actual: 6
Expected: 20, Actual: 6
Expected: 21, Actual: 21
Expected: 22, Actual: 22
Expected: 23, Actual: 22
Expected: 24, Actual: 22
Expected: 25, Actual: 22
Expected: 26, Actual: 22
Expected: 27, Actual: 22
Expected: 28, Actual: 22
Expected: 29, Actual: 22
Expected: 30, Actual: 22
Expected: 31, Actual: 22
Expected: 32, Actual: 22
Expected: 33, Actual: 22
Expected: 34, Actual: 22
Expected: 35, Actual: 22
Expected: 36, Actual: 22
Expected: 37, Actual: 22
Expected: 38, Actual: 22
Expected: 39, Actual: 22
Expected: 40, Actual: 22
Expected: 41, Actual: 22
Expected: 42, Actual: 22
Expected: 43, Actual: 22
Expected: 44, Actual: 44
Expected: 45, Actual: 44
Expected: 46, Actual: 44
Expected: 47, Actual: 44
Expected: 48, Actual: 44
Expected: 49, Actual: 44
Expected: 50, Actual: 44
Expected: 51, Actual: 44
Expected: 52, Actual: 44
Expected: 53, Actual: 44
Expected: 54, Actual: 44
Expected: 55, Actual: 44
Expected: 56, Actual: 44
Expected: 57, Actual: 44
Expected: 58, Actual: 44
Expected: 59, Actual: 44
Expected: 60, Actual: 44
Expected: 61, Actual: 44
Expected: 62, Actual: 44
Expected: 63, Actual: 44
Expected: 64, Actual: 44
Expected: 65, Actual: 44
Expected: 66, Actual: 44
Expected: 67, Actual: 44
Expected: 68, Actual: 44
Expected: 69, Actual: 44
Expected: 70, Actual: 44
Expected: 71, Actual: 44
Expected: 72, Actual: 44
Expected: 73, Actual: 44
Expected: 74, Actual: 44
Expected: 75, Actual: 44
Expected: 76, Actual: 44
Expected: 77, Actual: 44
Expected: 78, Actual: 44
Expected: 79, Actual: 44
Expected: 80, Actual: 44
Expected: 81, Actual: 44
Expected: 82, Actual: 44
Expected: 83, Actual: 44
Expected: 84, Actual: 44
Expected: 85, Actual: 44
Expected: 86, Actual: 44
Expected: 87, Actual: 44
Expected: 88, Actual: 44
Expected: 89, Actual: 44
Expected: 90, Actual: 44
Expected: 91, Actual: 44
Expected: 92, Actual: 44
Expected: 93, Actual: 44
Expected: 94, Actual: 44
Expected: 95, Actual: 44
Expected: 96, Actual: 44
Expected: 97, Actual: 44
Expected: 98, Actual: 44
Expected: 99, Actual: 44