As mentioned, Bruno is an Open Source desktop tool to test out REST Services. You can download it and find the documentation here .
Below, I have included some screenshots on how to use Bruno:
First, to get started, we have to create a new Collection
The next step is to set up the authentication for our API call. On the 'Auth' tab, select 'Basic Auth' and paste in the username and password as we saw on this page .
All that is left to do now is to supply the input parameter (the airport IATA code). We can do this under the 'Body' tab.
Now we can send off our API call by clicking on the arrow next to the URL. If all goes ok, we should get a 200 OK message and see the Airport Name at the bottom of the Response.