How do I fix 'Port already in use' in Node.js?
Another process is using the port. Kill the other process or use a different port. On Mac/Linux, use lsof -i :PORT to find the process, then kill it. On Windows, use netstat -ano | findstr :PORT.
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More FAQs in Common Node.js Setup Errors and How to Fix Them
Node.js is not installed or not on your PATH. Install Node.js from the official site or use a version manager like nvm, then reopen your terminal so the PATH updates.
You are requiring a module that is not installed. Run npm install to install all dependencies from package.json, or install the specific package with npm install package-name.
Use a version manager like nvm so global installs do not need elevated permissions, and fix folder ownership for node_modules if it is wrong. Avoid using sudo, which masks the real problem and can cause more issues.
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