How to save the state of the Map view using angularjs and in JSON format?

[Shilpi Preet]

I have a map created using D3. There are specific points as per place name. Those point are movable as per user convinience to create a better view using dragging and zoomming. I need to create a "saved view of the map" for the user using angularjs and save the data in JSON format.So that when the user comes back they can have the same view of the map again. I need to capture scaling, longitude, latitude and data associated with those specific points. Please help me out with this.