How to write code to upload GeoJSON file and show in the map?

[Chin_WeiYap]

I am new to ArcGIS. How to write code to upload GeoJSON file and show in the map?

[RobertScheitlin__GISP]

Chin,

  If you are new to ArcGIS then you would not start with a API like the Flex API which is in mature status, meaning esri no longer supports it. You need to be looking at the JS API.