edit: NB these instructions have changed slightly for the v3 API
I’ve figured out a quick way to get the MD5 checksums of the files uploaded and decided to share it here, too. Log into your Google Drive account, then:
Visit: https://developers.google.com/drive/v3/reference/files/list
Scroll down to the Try it! section.
Change “Authorize requests using OAuth 2.0” from OFF to ON by clicking on it, then select:
https://www.googleapis.com/auth/drive.metadata.readonly
and click Authorize.
Choose your account then click Accept.
Fill in the fields field with:
for v2 API:
items(md5Checksum,originalFilename)
for v3 API:
open “Show standard parameters” in GUI to see fields than
files(md5Checksum,originalFilename)
to only get a list of filenames and MD5 checksums.
Click Execute and you’ll open a list with all the files uploaded to Google Drive and their MD5 checksums.