Need guidance on web request / JSON

[dgudkov]

I would suggest starting with this article:

Making your data better with web APIs

If you’re reading this article it’s safe to assume that you already have experience of working with data coming from spreadsheets, text files, and possibly, databases. What might be new for you is dealing with data from so called web (REST) APIs. Web APIs can be extremely helpful because they can provide valuable information that doesn’t exist in your corporate systems. Just a few examples of information/services web APIs can provide: Public holidays Exchange rates Address validation Language …

Also this one:
http://help.easymorph.com/doku.php?id=transformations:webrequest