axios-interceptors.js

import axios from "axios";

axios.defaults.baseURL = 'URL';

axios.interceptors.request.use(
  config => {
    const token = localStorage.getItem("token");

    if (token !== null) {
      config.headers.Authorization = token;
    }

    return config;
  },
  err => {
    return Promise.reject(err);
  }
);

axios.interceptors.response.use(
  response => {
    return response;
  },
  err => {
    if (err.response !== undefined) {
      if (err.response.status === 401) {
        localStorage.removeItem("token");
      }
    }
    return Promise.reject(err);
  }
);

export default axios;