Issue with deploying a Next.js app to Vercel and configuring CORS for Sanity.io

Hi, I’ve just tried to deploy my next app to vercel but i get an error. Before i was having issues with projectId not being found but i think i solved that, if i do vercel build, vercel deploy --prebuilt i get a preview site that works fine, when i just use vercel in the terminal i get this error.

Your issue looks to be with this line. You're likely not providing an absolute string or URL instance in your middleware.

hi thanks for your response, i thought it made sense to look into geInfo

getPageInfo*

im not sure i understand what it talks about in reference to the url, this is my first time makinga nextjs sanity app

Hmm, that doesn't look like a string/url issue then! Is it possible that your queries to sanity are failing? How is your client configured? Have you added Vercel to your CORS origins?

my sanity requests seem to be working fine when i dont try to deploy using vercel command ie if i use vercel deploy --prebuilt my site runs fine with all the content from sanity. The way i have my app is after i built all of my next app i integrated sanity into it ad at the end deployed to vercel, i havent deployed sanity studio yet as it seems to be running fine off the normal link. What would i need to do to add vercel to CORS

I tried but wasnt sure what link to add or what to do

thanks for your help, by messing around with a few things, i added the cors origin, routing in my config file etc ive got it to work.

Oh great!

one question in one of my files, ${process.env.NEXT_PUBLIC_BASE_URL} wont work

but if i put the actual url it does and im not sure why

ye thank you i was able to track down where to go the it was a case of just fiddling about to make it work

Is that base url being used in an API route?

yes

in my fetching from sanity i have it

but its defined in my.env file

That goes back to what I mentioned about absolute URLs earlier. This Stack Overflow thread is really helpful for understanding the concept.

alright ill check it out, honestly thank you for everything i was fed up of it ot working after i finished my site xD

Haha, I've been there, my friend! Glad we got it sorted out!