How to structure api calls in Vue.js?

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I am using axios as HTTP client for making api calls, I have created a gateways folder in my src folder and I have put files for each backend, creating axios instances, like following

myApi.js

import axios from 'axios'
export default axios.create({
  baseURL: 'http://localhost:3000/api/v1',
  timeout: 5000,
  headers: {
    'X-Auth-Token': 'f2b6637ddf355a476918940289c0be016a4fe99e3b69c83d',
    'Content-Type': 'application/json'
  }
})

Now in your component, You can have a function which will fetch data from the api like following:

methods: {
 getProducts () {
     myApi.get('products?id=' + prodId).then(response =>  this.product = response.data)
  }
}

Similarly you can use this to get data for your vuex store as well.

Edited

If you are maintaining product related data in a dedicate vuex module,
you can dispatch an action from the method in component, which will internally call the backend API and populate data in the store, code will look something like following:

Code in component:

methods: {
 getProducts (prodId) {
     this.$store.dispatch('FETCH_PRODUCTS', prodId)
  }
}

Code in vuex store:

import myApi from '../../gateways/my-api'
const state = {
  products: []
}

const actions = {
  FETCH_PRODUCTS: (state, prodId) => {
    myApi.get('products?id=' + prodId).then(response => state.commit('SET_PRODUCTS', response))
  }
} 

// mutations
const mutations = {
  SET_PRODUCTS: (state, data) => {
    state.products = Object.assign({}, response.data)
  }
}

const getters = {
}

export default {
  state,
  mutations,
  actions,
  getters
}

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