Nuxt/examples/custom-routes/pages/users/_id.vue

<template>
  <div class="user">
    <h3>{{ name }}</h3>
    <h4>@{{ username }}</h4>
    <p>Email : {{ email }}</p>
    <p><nuxt-link to="/">List of users</nuxt-link></p>
  </div>
</template>

<script>
import axios from 'axios'

export default {
  validate ({ params }) {
    return !isNaN(+params.id)
  },
  async asyncData ({ params, error }) {
    try {
      const { data } = await axios.get(`https://jsonplaceholder.typicode.com/users/${+params.id}`)
      return data
    } catch (e) {
      error({ message: 'User not found', statusCode: 404 })
    }
  }
}
</script>

<style scoped>
.user {
  text-align: center;
  margin-top: 100px;
  font-family: sans-serif;
}
</style>