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Roadmap to becoming a developer in 2022
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developer-roadmap/content/roadmaps/107-nodejs/content/101-nodejs-modules/102-global-keyword.md

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global Keyword

In browsers, the top-level scope is the global scope. This means that within the browser var something will define a new global variable. In Node.js this is different. The top-level scope is not the global scope; var something inside a Node.js module will be local to that module.

Free Content global Keyword in Node.js