forEach loop through two arrays at the same time in javascript

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Use the second parameter forEach accepts instead, which will be the current index you’re iterating over:

n = [1,2,3,5,7,8,9,11,12,13,14,16,17,18,20,21,22];

n.forEach((element, index) => {
  console.log(element, index);
});

If you have two separate arrays to begin with, in each iteration, access the [index] property of the other array:

var n = [1, 2, 3, 5, 7, 8, 9, 11, 12, 13, 14, 16, 17, 18, 20, 21, 22];
var m = [0, 1, 2, 3, 4, 5, 6, 7,  8,  9,  10, 11, 12, 13, 14, 15, 16];

n.forEach((num1, index) => {
  const num2 = m[index];
  console.log(num1, num2);
});

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