how to url in nextjs app code example

Example 1: next link

import Link from 'next/link'

function Home() {
  return (
    <ul>
      <li>
        <Link href="/">
          <a>Home</a>
        </Link>
      </li>
      <li>
        <Link href="/about">
          <a>About Us</a>
        </Link>
      </li>
      <li>
        <Link href="/blog/hello-world">
          <a>Blog Post</a>
        </Link>
      </li>
    </ul>
  )
}

export default Home

Example 2: nextjs router get complete url

function getFullUrl(req, fallback) {
  //server side request object(req)
  if(req) {
    return req.protocol + '://' + req.get('host') + req.originalUrl
    
  } //making sure we are on the client side
  else if(!(typeof window === 'undefined')) {
    return window.location.href
    
  } else {
    return fallback
  }
}

//usage on nextjs
static async getInitialProps({req}) {
   let fullUrl = getFullUrl(req, "")//gets the full url or fallback to ""
    return { fullUrl: fullUrl }
}