Dynamic importing of json file is not refreshing

Question

Running

Dynamic[Refresh[Import["foo.json"], UpdateInterval->1]]

or

json := Import["foo.json"]

then

Dynamic[Refresh[json, UpdateInterval -> 1]]

do not update as expected!

I can evaluate json manually and get the current json in the file, but if I change the contents of the file, the output of Dynamic remains static.

Is there a way to achieve this sort of thing?

Answer 1

This can be done with Clock. The following will import foo.json every 5 seconds.

With[{update = 5},
  Dynamic[{foo = Import["~/Desktop/foo.json"], 
           Clock[{1, update, update}, update]}]]