CORS issue when I try to request from the Swagger UI on Vercel

When I try to run an endpoint on Swagger UI I have always the same issue :

CORS issue when I try to request from the Swagger UI on Vercel

When I try to run an endpoint on Swagger UI I have always the same issue :

Vercel deployment issues even after putting vercel.json file

I deployed a pinterest clone app which I made using Express and instead of the app, this is what’s appearing when I click on the link:

CORS error with deploying an express js server with vercel

Followed the instructions [here][1] to run an express server but I’m dealing with CORS errors when calling the backend via my next js app.

Vercel NodeJS Express Post method not working

I’m trying to deploy an api that was built on nodejs and somehow after submitting my request i see the error as below

Issues serving static image files after deployment to Vercel

Backend Directory (api)

MERN Stack app is running properly in local server but after deployed to production could not read MongoDB data

api/index.js

API functions timed out after deployment to vercel

routes/index.js

Deployment of mern app to vercel having issues occurred

index.js

Set maximum execution time for Express on Vercel

I deployed Express.js to vercel and It works relatively well.