Why is my Window Object inaccessible in my Next.js app, and how can I fix it?

Window Object Not Accessible in Next.js React App: A Solution

In a Next.js React app, developers may encounter a ReferenceError indicating that the window object is not defined. This occurs when attempting to access the window object during the server-side rendering phase of the application, as the window object is only available on the client-side.

To resolve this issue, it is necessary to differentiate between client-side and server-side code. One approach to achieve this is by using conditional statements to determine whether the code is executing on the client or server side. For instance, the following code snippet checks if the window object exists and executes the code accordingly:

if (typeof window !== "undefined") {
  // Client-side-only code
}

By implementing this conditional check, you can ensure that your code will only execute on the client-side where the window object is accessible. This approach allows you to separate your code based on the execution environment and prevents accessing the window object during server-side rendering, thereby resolving the error.

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