NUXT_FRONTEND/plugins/social-auth.js

import Vue from 'vue';
import axios from "axios";
import UniversalSocialAuth from "universal-social-auth";

const defaultOptions = {
  redirectUri: window.location.origin,
  oauthType: "2.0",
  responseType: "code",
  optionalUrlParams: ["display", "scope"],
  usePopup: true,
  display: "popup",
  state: true,
  popupOptions: { width: 500, height: 500 },
}

const options = {
  providers: {
    vk: {
      name: "vk",
      clientId: '6199950',
      authorizationEndpoint: "https://oauth.vk.com/authorize",  
      scope: 'email',
      ...defaultOptions
    },

    ok: {
      name: "ok",
      clientId: '1255143936',
      authorizationEndpoint: "https://connect.ok.ru/oauth/authorize",  
      scope: 'VALUABLE_ACCESS,GET_EMAIL',
      ...defaultOptions
    },

    fb: {
      name: "fb",
      clientId: '421123926237121',
      authorizationEndpoint: "https://www.facebook.com/v12.0/dialog/oauth", 
      scope: 'public_profile,email',
      ...defaultOptions
    },
  }
};

const oauth = new UniversalSocialAuth(axios, options);
Vue.prototype.$oauth = oauth;