GetRecords.cs

[FunctionName("GetRecords")]
public static async Task<IActionResult> GetRecords(
    [HttpTrigger(AuthorizationLevel.Function, "get", Route = "records")]
        HttpRequest req,
    [CosmosDB(databaseName: "Records", collectionName: "records", ConnectionStringSetting = "CosmosDBConnection")]
        DocumentClient client)
{
    var queryParams = req.GetQueryParameterDictionary();
    // Maximum records to return (default to 50)
    var count = Int32.Parse(queryParams.FirstOrDefault(q => q.Key == "count").Value ?? "50");
    // Continuation token (for paging)
    var continuationToken = queryParams.FirstOrDefault(q => q.Key == "continuationToken").Value;

    // Build query options
    var feedOptions = new FeedOptions()
    {
        MaxItemCount = count,
        RequestContinuation = continuationToken
    };

    var uri = UriFactory.CreateDocumentCollectionUri("Records", "records");
    var query = client.CreateDocumentQuery(uri, feedOptions)
        .AsDocumentQuery();

    var results = await query.ExecuteNextAsync();
    return new OkObjectResult(new
    {
        hasMoreResults = query.HasMoreResults,
        pagingToken = query.HasMoreResults ? results.ResponseContinuation : null,
        results = results.ToList()
    });
}

response.json

{
  "hasMoreResults": true,
  "pagingToken": "{\"token\":\"AV40ANomRkpkAAAAAAAAAA==\",\"range\":{\"min\":\"\",\"max\":\"FF\"}}",
  "results": [{ }]
}