Directing non-www to www in Next.js has never been easier

Based on the information I've gathered, it seems that using www is more effective than not using it. I am interested in redirecting all non-www requests to www.

I am considering adding this functionality either in the next.config.js file or, if that's not possible, in the middleware.js file.

Answer №1

Thanks to the assistance of @Johan, I have successfully crafted a solution for nextjs:

// middleware.ts
import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'

// Make this function `async` if using `await` internally
export function middleware(req: NextRequest) {
    const host = req.headers.get('host')
    if (host?.slice(0, 4) !== 'www.' && !host?.includes('localhost')) {
        return NextResponse.redirect(`https://www.${host}${req.nextUrl.pathname}`, 301);
    }
}

Answer №2

If you're unable to achieve it using next.config.js, consider implementing the following code in your primary js file with express:

const server = express()

server.use((req, res, next) => {
  if (req.headers.host.slice(0, 4) === 'www.') {
    next()
  } else {
    res.writeHead(301, {
      Location: `https://www.${req.headers.host}${req.url}`
    })
    res.end()
  }
})

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