javascript - How to check if js code is running on node server or on the client

Question

I want to determine whether my js code is running on the node server or on the client, and store it into a variable isServer = true if it is running on the server. How can I do that? Is there a way to simply check for the existence of a property that is only available on the server and, if this is possible, which is the best option?

Thanks for help!

Answer 1

You could use this:

function is_server() {
   return ! (typeof window != 'undefined' && window.document);
}

As the global window.document object is only present in the browser context.