Joining List REST API

I want to use REST API to join two SharePoint lists.  

Any ideas or resources?
IsaacSharePoint Client Side DeveloperAsked:
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Rainer JeschorCommented:
I assume we are talking about SharePoint Server 2013.
Are the lists currenty "connected" as there is a lookup from the one to the other list?
If yes, then you can use the "$expand" option to load additional data from the lookup list.
If there is no lookup then imho you would have to fetch both list data and do the join on the client side.
There is a quite new library which provides Linq type functionality:
which offers the JOIN function passing two arrays.

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IsaacSharePoint Client Side DeveloperAuthor Commented:
Thanks Rainer! Yes I am using SharePoint 2013.
The Linq functionality is good to know.
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