After reading multiple articles on caching data for client in angular universal apps, I am still puzzled about how the data is transferred from server to the client. Should I inject the JSON into pre-rendered HTML or could there be another method that I'm overlooking?
Starting from angular 5, a module called TransferStateModule is included in the angular core to handle data transfer tasks for you. You can find more information about it here: https://angular.io/api/platform-browser/TransferState
The process involves caching your API response on the server side along with a StateKey, which is essentially a string. This data is then serialized as Json and embedded into the DOM before being sent to the client. On the client side, you can retrieve the data by accessing the StateKey and parsing the Json.
In the official Universal Starter Kit, you can learn where and how to register this functionality: https://github.com/angular/universal-starter
Update on Angular 6:
You no longer need to manually set the State keys. The updated TransferStateModule now includes an HttpClient Interceptor that handles key setting automatically! However, if you prefer more control, you still have the option to set the keys yourself. Integrating the module has become much easier (the latest universal starter kit already includes it by default!)
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