Thank you for your response.
Were you able to run the sample provided by us?
Kindly run the web service and copy the web service URL and
paste it into the “ServiceUrl=https://localhost:44399/pdfviewer”
of index.razor file of the blazor project and the pdf gets loaded in the
sample.
We have provided the video of running the sample and we
were able to get the values in the JSON object you can find it in the video and
we have provided the image of the sample loading the PDF.

It is not possible to get the null value in the JSON object
of the load method.
Note: Kindly provide us with the sample in which you are
replicating the issue or else provide the modified sample.
This will help us to analyze the issue further and provide
the required details.