Nik

const auth = {
  state: {
    authUser: null
  },
  actions: {
    nuxtServerInit ({ commit}, {req}) {
      if (req.session && req.session.authUser) {
        commit('SET_USER', req.session.authUser)
      }
    },
    login ({ commit, username, password}) {
      return axios.post('/api/loin', {
        username,
        password
      })
        .then((res) => {
          commit('SET_USER', res.data)
        })
        .catch((error) => {
          if (error.response.status === 401) {
            throw new Error('Bad credentials')
          }
        })
    },
    logout({ commit }) {
      return axios.post('/api/logout')
        .then(() => {
        commit('SET_USER', null)
        })
    }
  },
  mutations: {
    SET_USER: function (state, user) {
      state.authUser = user
    }
  }
};

methods: {
      login () {
        this.$store.dispatch('login', {
          username: this.formUsername,
          password: this.formPassword,
        })
          .then(() => {
            this.formUsername = '';
            this.formPassword = '';
            this.formError = null;
            this.$router.push({ path: '/summary' });
          })
          .catch((e) => {
            this.formError = e.message
          });

      },
      logout () {
        this.$store.dispatch('logout')
      }
    }