Downgrade nodejs when needed using CLI [New Question]

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Downgrade nodejs when needed using CLI

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Downgrade nodejs when needed using CLI
Description
A quick question, answered on Heelpbook, about how to "Downgrade nodejs when needed using CLI", on both Windows and Linux platforms. Here two available methods (they are not the only ones) to downgrade nodejs (and npm) using command line approach.
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Heelpbook.net