Axios interceptors token refresh for few async requests. ES6

axios-interceptors-refresh-token.js

import axios from "axios";
import { settings } from "../settings";
import { authAPI } from ".";

const request = axios.create({
  baseURL: settings.apiV1,
});

request.interceptors.request.use(
  (config) => {
    // Get token and add it to header "Authorization"
    const token = authAPI.getAccessToken();
    if (token) {
      config.headers.Authorization = token;
    }

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

let loop = 0;
let isRefreshing = false;
let subscribers = [];

function subscribeTokenRefresh(cb) {
  subscribers.push(cb);
}

function onRrefreshed(token) {
  subscribers.map((cb) => cb(token));
}

request.interceptors.response.use(undefined, (err) => {
  const {
    config,
    response: { status },
  } = err;
  const originalRequest = config;

  if (status === 401 && loop < 1) {
    loop++;
    if (!isRefreshing) {
      isRefreshing = true;
      authAPI.refreshToken().then((respaonse) => {
        const { data } = respaonse;
        isRefreshing = false;
        onRrefreshed(data.access_token);
        authAPI.setAccessToken(data.access_token);
        authAPI.setRefreshToken(data.refresh_token);
        subscribers = [];
      });
    }

    return new Promise((resolve) => {
      subscribeTokenRefresh((token) => {
        originalRequest.headers.Authorization = `Bearer ${token}`;
        resolve(axios(originalRequest));
      });
    });
  }
  return Promise.reject(err);
});

export default request;

Tks you so much!

Why we store promise to requestSubscribers? Can't we just return it diretcly, like return new Promise(resolve => {...

Why we store promise to requestSubscribers? Can't we just return it diretcly, like return new Promise(resolve => {...

Hi Herbert 😊,

Sure. I will fix it soon)

Congrats!

Thanks a lot, Saved my day :)

Can't this end up in an infinite loop if the refresh endpoint returns a 401?

How to redirect back to /login after any 401 occurred and clear the tokens? Where to place that logic? Can you help in this regard.Thanks

not working to me

For everyone, I recommended using this library instead https://www.npmjs.com/package/axios-auth-refresh