Next.js troubleshooting

Fix Next.js Build Error: Module Not Found

A Module Not Found error is usually a missing package, wrong import path, case mismatch, or alias not configured in the build environment. Treat the first missing module in the log as the root clue.

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Common symptoms

next build fails with Module not found.
It works on Windows or macOS but fails on Linux CI.
The missing import uses @/ or a custom alias.

What to check first

Platform: Next.js
Error: Module not found during build

A Module Not Found error is usually a missing package, wrong import path, case mismatch, or alias not configured in the build environment. Treat the first missing module in the log as the root clue.

Step-by-step fix

Copy the exact missing module name from the first error, not the last error.
Install missing packages and commit the updated lockfile.
Check import path casing because Linux deploy environments are case-sensitive.
If using aliases, verify tsconfig.json or jsconfig.json paths and restart the build.

# Install a missing dependency
npm install package-name

# Check clean build
npm ci
npm run build

Common mistake to avoid

Do not fix later cascade errors first. Start with the first missing module reported by the build.

Still stuck?

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