You can’t send the API key in the url, it has to be passed as a header. You can send header info from the client via javascript (assuming it’s web based), but beware of exposing your key like that.

That does not quite answer my question. I did go through the documentation but the instructions are for backend calls.
I want to have a clean url that I can use for a GET request and consume the information through the client side of my app.
The instructions provide information for curl, java, node etc but do not explain what the url should look like.

For example, other applications have the url format as:
https://someApiService.com/articles?source=someSource&sortBy=someShorting&apiKey=1234567890

what is the correct syntax for the url to have the api key attached and return the words?

Hi papostolopoulos,
You have to send it in the ‘X-Mashape-Key’ header. You can find examples in several languages on the Documentation page:

https://market.mashape.com/wordsapi/wordsapi