« `

First, you need to check if `rubberKey` is in the URL’s query parameters. You can do this by using the URLSearchParams interface like this:
« `
const urlParams = new URLSearchParams(window.location.search);

if (urlParams.has(‘rubberKey’)) {
const rubberKey = urlParams.get(‘rubberKey’);
// pass rubberKey on to the rest of your code
}
« `
Then, you can use the above code to check if `rubberKey` exists in the URL’s query parameters. If it does, you can use it as a variable in your code as normal.

Side note: it might be better to use `&rubberKey=1116mm` instead of `?rubberKey=1116mm` in the URL so that you can add multiple query parameters. `?` is usually reserved for the beginning of a new URL.