Why do I get 'Cannot use import statement outside a module'?
You are using import instead of require in a CommonJS project. Either switch to require, or set 'type': 'module' in package.json to enable ES modules. Pick one module system and use it consistently.
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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.
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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