About the ArcGIS web map JSON format
When you make and save a map using ArcGIS.com or Portal for ArcGIS, the map receives a unique ID. You can reference this ID to pull the entire map into any application you build with Esri APIs. This is made possible through the ArcGIS web map, a structured series of key-value pairs that describe all the layers, pop-up information, bookmarks, metadata, and other properties of the map.
There are two strings of JSON associated with a web map:
- The web map item information contains a title, description, and other metadata used to advertise the web map on ArcGIS.com or your own organization's portal.
- The web map data contains information needed to display the map, including layers, pop-up information, and bookmarks.
For full reference documentation on how the web map is structured, see ArcGIS web map JSON format.