Next.js + React Go back to the previous page

EDIT: 2 years after this answer was first posted, the router method is now well documented. Here is the code straight from the documentation:

import { useRouter } from 'next/router'

export default function Page() {
  const router = useRouter()

  return (
    <button type="button" onClick={() => router.back()}>
      Click here to go back
    </button>
  )
}

ORIGINAL ANSWER:

There is an undocumented Router.back method (see source) that just does window.history.back()

You should have a component like so

import Router from 'next/router'

export default function BackButton() {
    return (
        <div onClick={() => Router.back()}>Go Back</div>
    )
}