How to find the JSON string of any arcgis layer (hack ESRI new viewer)

Question

Warning: Following method hack ESRI's web application

 

https://gisportal.hrsa.gov/server/rest/services/HealthCareFacilities/PrimaryHealthCareFacilities_FS/MapServer?f=html

 

 

 

 

1) click   ArcGIS Online Map Viewer

https://gisportal.hrsa.gov/server/rest/services/HealthCareFacilities/PrimaryHealthCareFacilities_FS/MapServer?f=html

 

 

 

 

 

 

2) Use new viewer click top link

 

 

 

 

3) New viewer

 

 

 

 

 

4) change style

 

 

 

 

 

 

5) JSON string is here