Run process.version:
The version property of the process object returns a string with the current Node.js version.
In the browser the process object is not defined, so you will get a ReferenceError:
Another way is to reference process.versions (plural):
This returns an object that contains various properties referencing each component’s version.
To get the major version (in this example 12) you can use
process.versions.node.split('.')[0]
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