Quasar recommends Axios during project initialization: Use Axios for Ajax calls? (Y/n)

Then you should create a new boot file axios.js that looks like this: (Here you can also specify additional settings for your axios instance)

// src/boot/axios.js

import Vue from 'vue'
import axios from 'axios'

Vue.prototype.$axios = axios
// ^ ^ ^ this will allow you to use this.$axios
//       so you won't necessarily have to import axios in each vue file

const api = axios.create({ baseURL: 'https://api.example.com' })
Vue.prototype.$api = api
// ^ ^ ^ this will allow you to use this.$api
//       so you can easily perform requests against your app's API

export { axios, api }

Also make sure to yarn/npm install the axios package.

Usage in your single file components methods will be like below. Notice that in the next example we’re using the Quasar’s Notify plugin (through this.$q.notify) which you’ll need to install (follow the link earlier).

import { api } from 'boot/axios'

methods: {
  loadData () {
    api.get('/api/backend')
      .then((response) => {
        this.data = response.data
      })
      .catch(() => {
        this.$q.notify({
          color: 'negative',
          position: 'top',
          message: 'Loading failed',
          icon: 'report_problem'
        })
      })
  },
}

Usage in Vuex Actions for globally adding headers to axios (such as during authentication):

import { api } from 'boot/axios'

export function register ({commit}, form) {
  return api.post('/auth/register', form)
    .then(response => {
      api.defaults.headers.common['Authorization'] = 'Bearer ' + response.data.token
      commit('login', {token: response.data.token, user: response.data.user})
    })
}

Also look at Axios docs for more information.