@MathieuRA That worked! Thank you. I thought json was the default format and it seems --json must be right after the rest word. I tried putting it at the end and it didn't work but not a big deal. Thank you. How do you mark this post as resolved?

@Gurve Even though I figured out how to do it all in xo-cli now, I haven't figured out how to build the filter search in the querystring using the API method you mentioned above. Could you give me a couple examples for my curiosity as I may need it in the future.
&filter=[namelabelSearch]

@Gurve I was trying it your way and then I noticed something in the doc where we can use xo-cli to call any REST method. So from your example we can do the following in xo-cli

get all VMs
xo-cli rest get vms

get single vm with id. this includes the VDI disks IDs I needed
xo-cli rest get vms/d55b0683-2fb9-7b06-6fa5-be6f2065e4b5

get vdis for a vm by vm id
xo-cli rest get vms/d55b0683-2fb9-7b06-6fa5-be6f2065e4b5/vdis

get VDI details with vdi ID
xo-cli rest get vdis/50436f36-5d5b-4048-9834-2cad0b869f66

Thank you so much!! you solved my problem

I figured out how to expand a VDI disk if I can get the id of the disk. But how do I get a list of disks attached to a VM if I have the name label of a vm? This is what I would run to get object details of the vm but I was hoping it would show a list of VDI ids attached to this VM but it doesn't.

xo-cli list-objects name_label=vmtest1