I would like to know weather we can use SPSiteDataQuery in JSOM or not. If yes request anyone to please guide me .

we all knew that SpSiteDataQuery is Much faster when compared to SPQuery, And I am retrieving some large amount of list items


JSOM does not provide a mechanism for querying data across multiple lists that are not associated by a lookup field. In other words, there is no client-side functional equivalent of the SPSiteDataQuery class.


You can leverage Search APIs to get results from multiple sub sites. See this article about SharePoint 2013 search Query APIs: https://docs.microsoft.com/en-us/sharepoint/dev/general-development/using-the-sharepoint-search-query-apis

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