How do I detect I am on server vs client in Next.js

Question

I am using a customer express server with Next.js. It\'s running within a container. I am doing an http request with isomorphic-fetch to get data for my render.

Answer 1

Now (2020 Jan) it should be typeof window === 'undefined' since process.browser is deprecated

Refer to https://github.com/zeit/next.js/issues/5354#issuecomment-520305040