How can I specify the format?

[thelinuxlich]

How can I specify the format?

[StefanTerdell]

From what I can tell there's no native way to do that in Zod. You can open an issue or a PR in the Zod repo to add something like z.string().base64(). Then we can represent that as format: "binary" if the target is Open API.

[thelinuxlich]

I'd convert these to binary:

z.instanceof(File)
z.instanceof(Buffer)
z.instanceof(Blob)

[StefanTerdell]

There's no way to serialize an instanceof check unfortunately, and you're not describing the serialized data with that schema anyway. The base64 route is probably your best bet still

[StefanTerdell]

Added a PR over at Zod for a base64 check. I guess we'll see how that goes :) colinhacks/zod#3047