Something really cool about Plunker (I think JSFiddle can do this too) is that you can request one of you files via XHR! So if you need to request some json or XML data from the "server" it can easily be one the files you created!
Can check something online even if I not on the same PC....need not have installation. Just go online on a link and test codes
Our users have written 2 comments and reviews about Plunker, and it has gotten 26 likes