Reading spreadsheet resource as csv

In my app i'm trying to read a spreadsheet as a csv with no success and I wonder if there's any way to do it? I also tried to read the csv from the a file uploader but I can find a way to read it as a csv for some reason...
Thanks in advance

Have you check this ?

Here is docs

Agree with @AnsonHwang 's suggestion - @Gil_Delouya thanks for asking about this, would using a fileButton component with the parse files setting and leveraging the fileUtils methods work for you?