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I'm new to AngularJS and am trying to build myself a simple little app. I have JSON data for the app being fetched with $resource, and this data should be the same across multiple views/routes. However, when I go to a new route, the JSON data (stored as $scope.data) is no longer available to the new view. What can I do to pass this data to the new view and not require another fetch? (The tutorial phone-catalog app re-fetches this data every time from what I can tell.)

From what I understand, $rootScope can do this but it seems to be generally frowned upon. I apologize if this doesn't make much sense; I'm very much diving in the deep end here.

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Use a service to store the data. Inject that service into each controller that needs access to this data. Each time a controller is created and executes (because you switch to another view/route), it can ask the service for the data. If the service doesn't yet have the data, it can make a request to the server and return a promise to the controller (see below for how to do that). If the service has the data, it can return it to the controller immediately.

See also Processing $http response in service

Note that services are singletons, unlike controllers.

Another variation: when the service is created, it can go fetch the data itself, and then store it for later use. Controllers can than $watch properties or functions on the service. For an example of this approach see How do I store a current user context in Angular?

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Thanks for the thorough response! Unfortunately, I still can't seem to get it to work (I'm trying the first method, which seems more natural to me). I have $routeProvider defining two routes, for now each mapping to the same controller. The controller calls service.async().then(...) and the service's async method returns the promise defined by http.get('/data.json'). And each time I navigate within the app to a new route, a new HTTP request to data.json is made. Any thoughts would be greatly appreciated.
@ConstableJoe, try turning $http caching on. I should have mentioned that in my answer.

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