Next.js 16 API Build Errors

In this repository you will find three test cases for API Routes, one of which produces a build error.

To reproduce

• Install dependencies

# Install dependencies
pnpm install

# Run development server
pnpm dev

# Visit http://localhost:3000

• Create a build

pnpm build

Test Case 1 (Using Try Catch)

• Code:

• Build Error:

• GET Request on Localhost (No problems):

• Build Error on Vercel deployment:

• GET Request on Vercel deployment (No problems):

Test Case 2 (Using await connection + Try Catch - No errors)

Test Case 3 (Using nothing - No errors)