Top 700 technical problems

Next.js API route returns HTML instead of JSON

npm install fails with dependency resolution error

Next.js environment variable works locally but is undefined after deployment

pnpm creates multiple versions of the same dependency

Next.js page works locally but returns 404 in production

global npm package is installed but unavailable in terminal

Next.js image loads locally but fails after deployment

JWT appears valid but backend rejects signature

Next.js middleware keeps redirecting users in a loop

Reverse proxy strips required authorization header