How do I detect I am on server vs client in Next.js
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
You can use process.browser
to distinguish between server environment (NodeJS) and client environment (browser).
process.browser
is true
on the client and undefined
on the server.
Since I don't like depending on odd third party things for this behavior (even though process.browser
seems to come from Webpack), I think the preferred way to check is for presence of appContext.ctx.req
like this:
async getInitialProps (appContext) {
if (appContext.ctx.req) // server?
{
//server stuff
}
else {
// client stuff
}
}
Source: https://github.com/zeit/next.js/issues/2946