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


json := Import["foo.json"]


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?

  • $\begingroup$ Try Dynamic[Refresh[json, TrackedSymbols :> {}, UpdateInterval -> 1]] $\endgroup$ Mar 16, 2015 at 21:51

1 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]}]]
  • $\begingroup$ This worked. Thanks! $\endgroup$
    – epylar
    Mar 16, 2015 at 19:56
  • $\begingroup$ But why is UpdateInterval not working? $\endgroup$
    – VividD
    Sep 14, 2015 at 16:01
  • $\begingroup$ The update interval of 5 sec. works as expected in the code I posted in this answer, so I don't understand what you asking? $\endgroup$
    – m_goldberg
    Sep 14, 2015 at 20:20

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