Great question — answering as the UphillTech team:
Short answer: Yes, You can use both. They serve different purpose and can be used in the same application. According to NextJS docs : Next.js uses the App component to initialize pages. To override, create the ./pages/_app.js file and override the App class and Pages in Next.js skip the definition of the surrounding document's markup. For example, you never include <html> , <body> , etc. To override that default behavior, you must create a file at ./pages/_document.js , where you can extend the Document class. Note : _document.js is only rendered on the server side and not on the client side. so event handlers like onClick is not going to work.
Full answer by MoHo: https://stackoverflow.stackexchange.com/a/53324246 (CC BY-SA 4.0).
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