Formatting output

I’m getting ready to build an action that goes through something I have set up in Latenode that gets the weather at my location, and I know that the weather API returns a big JSON packet with data keys and values. One thing to do is format it up and make it look somewhat nice, say in a little desktop widget that updates every 30 minutes.

Where can I find discussions about how to format raw data output received from an API? Also, for JSON, how do you deal with arrays of data? Or master/detail results in general?