Your JSON is invalid. If you've used that JSON as shown in your message above, you will probably be able to see an error in the console.
Problems with the JSON:
- the property names should be in double quotes
- the values 01 and 05 aren't accepted as numbers
Fix these issues and it should work fine.
I'm also assuming that you have matched the filenames (emp.json != std.json) :-)
dj