A question about Google Map demo

[GeneralLi95]

When I download the code about "Google Map" demo and run, there is question that

Refused to execute script from 'http://localhost:63342/kd-tree-javascript-master/examples/map/data.json' because its MIME type ('application/json') is not executable, and strict MIME type checking is enabled.

I guess that the file "data.json" is not strictly a json file. So I recommand we rename the file with 'data.js', and this can solve the problem.