There are four operation values which a user may use: addition, subtraction, multiplication, and division.
The route format to use is http://localhost:3000/:operator/:num1/:num2.
When that route is hit, your browser should display the result of the math operation and the two numbers on the screen.
For example, when the user goes to http://localhost:3000/addition/10/1, the page should display 11.
npm installnode calculator.js