Writing to Excel with a changing hashmap and Nodejs

I am using nodeJS to collect data from a page with a log in, everytime a button is pressed, I get the time, who pressed the button, and which button they pressed.

I want to put it into excel, or somewhere else (if anyone has a recommendation), where this is the output:

    |john|joe|amanda

1:00 | 2 | b | c |

1:01 | 4 | a | 3 |

etc. etc.

This would be where each name has the values it pressed below it.

Putting it into excel is not the problem. The problem is making sure that each users data goes in their column. How can I iterate through excel, quickly to make sure each value is put into the correct key? There will be 50 users, so speed and efficiency will be important.

I will elaborate more if needed.

Thanks!

via user2487686