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The Parent parent was talking about if you don’t use Next and want a more sophisticated setup then then those are alternatives.

The parent then asked why do you need to integrate [react] with Express and my answer was if you want to do server side (not using Next)

React was not even mentioned in the thread. OP mentioned integration Next with Express, not React.

Using Express and Next together is relatively common (or at least used to be): https://github.com/shdnx/next-express