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How can you leverage SharePoint's REST API to programmatically retrieve all documents within a library that have not been modified in the last six months?



To retrieve all documents within a SharePoint library that have not been modified in the last six months using the SharePoint REST API, you need to construct a specific OData filter query within your API request. First, you need the URL of your SharePoint library. Assuming your SharePoint site is 'https://yourtenant.sharepoint.com/sites/yoursite' and your library is named 'Documents', the base URL would be 'https://yourtenant.sharepoint.com/sites/yoursite/_api/web/lists/GetByTitle('Documents')/items'. To filter the documents by their 'Modified' date, you need to add an OData filter query to the URL. This query will compare the 'Modified' date to a date six months ago. Construct the filter query as follows: '?$filter=Modified lt DateTime'[Date Six Months Ago]''. The '[Date Six Months Ago]' needs to be replaced with the actual date six months prior to the current date in ISO 8601 format (YYYY-MM-DDTHH:MM:SSZ). For example, if today is 2024-01-01, the date six months ago would be approximately 2023-07-01, so the query becomes '?$filter=Modified lt DateTime'2023-07-01T00:00:00Z''. Combine the base URL and the filter query to create the complete API endpoint: 'https://yourtenant.sharepoint.com/sites/yoursite/_api/web/lists/GetByTitle('Documents')/items?$filter=Modified lt DateTime'2023-07-01T00:00:00Z''. To retrieve all properties of the documents, add a '$select=*' to the query string as well, resulting in: 'https://yourtenant.sharepoint.com/sites/yoursite/_api/web/lists/GetByTitle('Documents')/items?$select=*&$filter=Modified lt DateTime'2023-07-01T00:00:00Z''. Finally, send an HTTP GET request to this endpoint with the appropriate authentication headers (e.g., an OAuth 2.0 access token). The response will contain a JSON payload with all the documents that have not been modified in the last six months. You might need to handle pagination if the library contains a large number of documents, using the '@odata.nextLink' property in the response to retrieve the next set of results.