How do I verify that Node.js and npm are working correctly after an upgrade?

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Grade: Education Subject: Support
How do I verify that Node.js and npm are working correctly after an upgrade?
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After upgrading, verify that Node.js is working correctly by running `node -v` and `npm -v`. Also, try running a simple Node.js script (e.g., `console.log('Hello, world!');`) to ensure that the core functionality is working. Check if any existing projects are compatible with the new Node.js version by running their scripts and inspecting the error messages.