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Showing content from https://developers.arcgis.com/documentation/mapping-and-location-services/mapping/web-maps/ below:

Web maps | Documentation | Esri Developer

Web map of Santa Monica trails created in Map Viewer and displayed in a custom app

What is a web map?

A web map is an item in a portal that contains the properties and settings for a map. The item includes properties such as the initial map extent, basemap, data layers, and all of the styling settings. To create and save a web map you use Map Viewer or ArcGIS Pro. These tools allow you to interactively design and configure a map. After creating a web map, you can use it to display the map in custom application. This type of application is known as a map app using web maps.

You use a web map when you want to:

Create a map that you can share with other users and applications.
Interactively design and style layers in a map.
Configure popups for data layers in a map.
Display a map in an application built with ArcGIS Maps SDKs.
Display a map using low-code/no-code app builders.
Securely store and access a map in a portal.
Remotely configure a map at any time to change your application.

Best practices

It is recommended to use the ArcGIS Maps SDKs to build map apps that use web maps. The SDKs provide full support to access and display all of the settings stored in the web map. This greatly reduces the amount of code required to style, display, and manage a map in an application. Most open source libraries do not provide support for web maps.

How to use a web map

The general workflow to use a web map in a custom application is:

1. Create

To create a new web map, you can use Map Viewer or ArcGIS Pro. These tools allow you to design and configure a map interactively and then save it in a portal.

Some of the key types of configurations you can make include following:

Initial extent: Set the starting location and zoom level for the map.
Basemap: Set the basemap style such as streets, navigation, light gray, or satellite imagery.
Data layers: Add hosted layers to display features on the basemap.
Style data layers: Set the symbol color and renderers used to style hosted layers.
Style popups: Set the presentation of the data and information when users click on data layers in the map.

To access Map Viewer and ArcGIS Pro you need an ArcGIS account with the appropriate user type, role, and permissions. Learn more about creating web maps with these tools in ArcGIS Online > Create and ArcGIS Pro > Share.

Code example

To create a web map, go to Display a web map with a pin.

2. Manage

After configuring a web map, you use Map Viewer or ArcGIS Pro to save and share the web map in a portal. To save a web map as an item, you need to provide meta data such as the title, folder, categories, tags, and summary. When it is saved, the item is assigned a unique item ID. The final step is to set the sharing level for the web map item. The sharing level determines which ArcGIS users and applications can access the web map. The sharing level can be set to owner (private), group, organization, or everyone (public). To learn more about managing items and sharing levels, go to Content and data services > Manage content > Sharing.

Code example

To manage a web map, go to Display a web map with a pin.

Portal and data services guide

To learn more about how to create and manage web maps in your portal, go to Items.

3. Access

After you create and save a web map, you can access the item with a custom application built with ArcGIS Maps SDKs. To do so, you need the portal URL and item id for the web map. With these, you can access the web map's preconfigured settings and display the map. The web map defines the initial state of the map when an application starts. If you need to remotely update the map in your application, you can use Map Viewer or ArcGIS Pro to edit and save the web map while it is referenced. The changes will be reflected in your application the next time it is loaded.

Example code to access a web map:

ArcGIS Maps SDK for JavaScript ArcGIS Maps SDK for JavaScript ArcGIS Maps SDK for .NET ArcGIS Maps SDK for Kotlin ArcGIS Maps SDK for Swift ArcGIS Maps SDK for Java ArcGIS Maps SDK for Qt ArcGIS Maps SDK for Flutter ArcGIS API for Python

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      const webmap = new WebMap({
        portalItem: {
          id: "1531b5d82e674a50adcf2eaf95156bc7", // Replace with your web map ID
        },
      })

Code example

To display a web map, go to Display a web map with a pin.

Topic

To learn about the JSON properties and structure of a web map, go to the Web Map Specification.

Security and authentication guide

If the sharing level of the web map item or any of it's layers are not set to Everyone (public), you need to use authentication to access it. To learn more about accessing secure resources in a portal, go to Types of authentication.

Code examples Display a web map with a pin

Create a web map

Sign in to your portal and click Map.
In Map Viewer, use Basemap to change the basemap to Light Gray Canvas.
Move the map and zoom to New York City.
Use Add > Create sketch layer to add a pin to the map. The web map should look like New York (web map with a pin).

Sign in to your portal and click Map.
In the left panel, click + > Browse layers > ArcGIS Online.
- In the search box, type Light Gray Canvas Base (for Developers).
- Click on the resulting Tile Layer from Esri Vector Maps, then click Use as basemap.
- In the search box, type Light Gray Canvas Reference (for Developers).
- Click on the resulting Tile Layer from Esri Vector Maps, then click Add layer to basemap.
Move the map and zoom to New York City.
Use + > Create sketch layer to add a pin to the map. The web map should look like New York (web map with a pin).

Manage a web map

In Map Viewer, Save the web map.
Share the web map with the appropriate sharing level.

Access a web map

Find the web map item ID or use 1531b5d82e674a50adcf2eaf95156bc7.
Write code to create a map.
Load and display the web map.

Security and authentication guide

To access the web map, you need to implement authentication if you set the sharing level to private, group, or organization. Learn more about the different types of authentication you can implement in Types of authentication.

When the web map is loaded by the application, it should look the same as the web map created with Map Viewer.

Custom app displaying a web map of New York with a pin.

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      const webmap = new WebMap({
        portalItem: {
          id: "1531b5d82e674a50adcf2eaf95156bc7", // Replace with your web map ID
        },
      })

Tutorial

For step-by-step instructions, go to Create a web map, Style layers in a web map, and Display a web map.

Portal and data services guide

To learn more about how to create and manage web maps in your portal, go to Items.

Display a web map with a data layer

This example shows how to create a web map with Map Viewer and display it in a custom app. The web map is configured with a light gray basemap centered and zoomed to New York City. It also includes a USA Structures (hosted feature layer) that is saved with the web map. The layer has a formatted popup that displays building structure information when you click on the map.

Create a web map

Sign in to your portal and click Map.
In Map Viewer, use Basemap to change the basemap to Light Gray Canvas.
Move the map and zoom to New York City.
Use Add > Browse layers > Living Atlas > "USA Structures" and add the layer to the map. The web map should look like New York (web map with a layer).

Sign in to your portal and click Map.
In the left panel, click + > Browse layers > ArcGIS Online.
- In the search box, type Light Gray Canvas Base (for Developers).
- Click on the resulting Tile Layer from Esri Vector Maps, then click Use as basemap.
- In the search box, type Light Gray Canvas Reference (for Developers).
- Click on the resulting Tile Layer from Esri Vector Maps, then click Add layer to basemap.
Move the map and zoom to New York City.
Use + > Browse layers > Living Atlas > "USA Structures" and add the layer to the map. The web map should look like New York (web map with a layer).

Manage a web map

In Map Viewer, Save the web map.
Share the web map with the appropriate sharing level.

Access a web map

Find the web map item ID or use 9d5bfb5340734021bf88041f8854a9f5.
Write code to create a map.
Load and display the web map.

Security and authentication guide

When the web map is loaded by the application, it should look the same as the web map created with Map Viewer.

Custom map app displaying a web map of New York with a building structure layer.

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      const webmap = new WebMap({
        portalItem: {
          id: "9d5bfb5340734021bf88041f8854a9f5", // Replace with your web map ID
        },
      })

Tutorial

For step-by-step instructions, go to Create a web map, Style layers in a web map, and Display a web map.

Portal and data services guide

To learn how to host your own data in ArcGIS, go to Introduction to data services.

Tutorials

Style layers in a web map

Use Map Viewer to style layers in a web map.

Map Viewer

Display a web map

Create and display a map from a web map.

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