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isBrowser javascript Code Snippet in 2024

browsernodeintermediate

Last Updated: 20 May 2024

Determines if the current runtime environment is a browser so that front-end modules can run on the server (Node) without throwing errors.

  • Use Array.prototype.includes() on the typeof values of both window and document (globals usually only available in a browser environment unless they were explicitly defined), which will return true if one of them is undefined.
  • typeof allows globals to be checked for existence without throwing a ReferenceError.
  • If both of them are not undefined, then the current environment is assumed to be a browser.
const isBrowser = () => ![typeof window, typeof document].includes('undefined');
isBrowser(); // true (browser) isBrowser(); // false (Node)

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