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Work with external data in SharePoint

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Important

The SharePoint Add-In model in SharePoint Online has been deprecated as of November 27th 2023, checkout the full retirement announcement to learn more.

Deprecation means that the feature will not get any new investments, but it's still supported. SharePoint add-in model is retired fully on April 2nd, 2026 and is no longer available after that time. Primary replacement technology for the SharePoint add-in model is SharePoint Framework (SPFx) which continues to be supported also in future.

In your SharePoint Add-ins, you frequently have to retrieve and manipulate data that is exposed by a remote web application or service from within a SharePoint page or component. Because custom code is not allowed on the SharePoint servers, your add-in must use JavaScript for this purpose. The model for SharePoint Add-ins provides multiple options for accessing the remote data and services.

Use the SharePoint cross-domain JavaScript library to access external data

You can use the cross-domain library to access data in your remote web application if you provide a custom proxy page that is hosted in the remote infrastructure. As the developer, you are responsible for implementing the custom proxy page, and you have to deal with custom logic such as the authentication mechanism, if there is one, to the remote application. Use the cross-domain library if you want the communication between the remote data source and the SharePoint page to occur at the client level.

For details about how to use the library in this way, see Create a custom proxy page for the cross-domain library in SharePoint.

Note

The SharePoint cross-domain library can also be used in the other direction; that is, JavaScript on remote webpages can use it to access data from SharePoint. For more information about this use of the library, see Creating SharePoint Add-ins that use the cross-domain library.

Use the SharePoint web proxy to access external data

You can use the web proxy that is exposed in the JavaScript client object model to access remote data. (The proxy is also available in the .NET client-side object model (CSOM), but you cannot use that object model in code that runs on the SharePoint servers.)

When you use the web proxy, you issue the initial request to SharePoint. In turn, SharePoint requests the data to the specified endpoint and forwards the response back to your page. Use the web proxy when you want the communication between the remote data source and the SharePoint page to occur at the server level.

For details about how to use the proxy, see Query a remote service using the web proxy in SharePoint.

See also