A query string is everything to the right of a question mark found in a URL or internet web address.
ex: google.com?search=mytown; the querystring is ‘search=mytown’.
The querystring variable is: search and the value of ‘search’ is ‘mytown’.
Create a node and paste this following code into it’s landing page editor. Goto the node’s address and test with browser. When testing this script type ‘/?anything=testing123’ after the URL address in your browser’s address bar. This example outputs: ‘testing123‘.