tienes que usar getStaticProps() si solo quieres obtener un parámetro

 // pages/posts/[id].js function Post({ post }) { // Render post... } // This function gets called at build time export async function getStaticPaths() { // Call an external API endpoint to get posts const res = await fetch('https://.../posts') const posts = await res.json() // Get the paths we want to pre-render based on posts const paths = posts.map((post) => ({ params: { id: post.id }, })) // We'll pre-render only these paths at build time. // { fallback: false } means other routes should 404. return { paths, fallback: false } } // This also gets called at build time export async function getStaticProps({ params }) { // params contains the post `id`. // If the route is like /posts/1, then params.id is 1 const res = await fetch(`https://.../posts/${params.id}`) const post = await res.json() // Pass post data to the page via props return { props: { post } } } export default Post

pero si también quieres obtener la ruta, puedes usar:

 import { useRouter } from 'next/router' //inside of your component const { asPath } = useRouter()