Nuxt - asyncData with multiple requests

Actually, you can, using the async await, which, looks a lot cleaner too.

<template>
  <div class="container">
    <h1>Request 1:</h1>
    <h1>{{ post.title }}</h1>
    <pre>{{ post.body }}</pre>
    <br />
    <h1>Request 2:</h1>
    <h1>{{ todos.title }}</h1>
    <pre>{{ todos.completed }}</pre>
  </div>
</template>

<script>
import axios from "axios";

export default {
  async asyncData({ params }) {
    // We can use async/await ES6 feature
    const posts = await axios.get(
      `https://jsonplaceholder.typicode.com/posts/${params.id}`
    );
    const todos = await axios.get(
      `https://jsonplaceholder.typicode.com/todos/${params.id}`
    );
    return { post: posts.data, todos: todos.data };
  },
  head() {
    return {
      title: this.post.title
    };
  }
};
</script>

here is a working sandbox of it. (don't forget to add a value for :id route param)

Maybe so?

asyncData ({params, app, error }) {

    return app.$axios.$get(`/seller/${params.username}`).then(sellerRes => {
        return Promise.all([
            app.$axios.$get(`/categories`),
            app.$axios.$get(`/seller/${params.username}/reviews`),
            app.$axios.$get(`/seller/${params.username}/products`)
        ]).then((categoriesRes, reviewsRes, productsRes) => {
            return {
                seller: sellerRes.data,
                metaTitle: sellerRes.data.name,
                categories: categoriesRes.data,
                reviewsSummary: reviewsRes.summary,
                products: productsRes.data,
            }
        })
    }).catch(e => {
        error({ statusCode: 404, message: 'Seller not found' })
    });

},

This is a chain of promises. The first promise tries to get information about the seller, if the request is successful, then a new request is created that will wait for the rest of the information.

Method asyncData will wait for all promises to complete and return the result of the call.

Try to use async await, this is how you can run both requests in parallel:

async asyncData ({ $axios }) {
  const [categoriesRes, articlesRes] = await Promise.all([ 
    $axios.get('/fetch/categories'),
    $axios.get('/fetch/articles'),
  ])

  return {
    categories: categoriesRes.data,
    articles: articlesRes.data,
  }
},