Axios create/recreate cookie session in node.js enviroment

axiosInterceptor.js

/* Basic example of saving cookie using axios in node.js and session's recreation after expiration.
 * We have to getting/saving cookie manually because WithCredential axios param use XHR and doesn't work in node.js
 * Also, this example supports parallel request and send only one create session request.
 * */

const BASE_URL = "https://google.com";

// Init instance of axios which works with BASE_URL
const axiosInstance = axios.create({ baseURL: BASE_URL });

const createSession = async () => {
  console.log("create session");
  const authParams = {
    username: "username",
    password: "password"
  };
  const resp = await axios.post(BASE_URL, authParams);
  const [cookie] = resp.headers["set-cookie"]; // getting cookie from request
  axiosInstance.defaults.headers.Cookie = cookie; // attaching cookie to axiosInstance for future requests
  return cookie; // return Promise<cookie> because func is async
};

let isGetActiveSessionRequest = false;
let requestQueue = [];

const callRequestsFromQueue = cookie => {
  requestQueue.forEach(sub => sub(cookie));
};
const addRequestToQueue = sub => {
  requestQueue.push(sub);
};
const clearQueue = () => {
  requestQueue = [];
};

// registering axios interceptor which handle response's errors
axiosInstance.interceptors.response.use(null, error => {
  console.error(error.message); //logging here

  const { response = {}, config: sourceConfig } = error;

  // checking if request failed cause Unauthorized
  if (response.status === 401) {
    // if this request is first we set isGetActiveSessionRequest flag to true and run createSession
    if (!isGetActiveSessionRequest) {
      isGetActiveSessionRequest = true;
      createSession().then(cookie => {
        // when createSession resolve with cookie value we run all request from queue with new cookie
        isGetActiveSessionRequest = false;
        callRequestsFromQueue(cookie);
        clearQueue(); // and clean queue
      }).catch(e => {
        isGetActiveSessionRequest = false; // Very important!
        console.error('Create session error %s', e.message);
        clearQueue();
      });
    }

    // and while isGetActiveSessionRequest equal true we create and return new promise
    const retryRequest = new Promise(resolve => {
      // we push new function to queue
      addRequestToQueue(cookie => {
        // function takes one param 'cookie'
        console.log("Retry with new session context %s request to %s", sourceConfig.method, sourceConfig.url);
        sourceConfig.headers.Cookie = cookie; // setting cookie to header
        resolve(axios(sourceConfig)); // and resolve promise with axios request by old config with cookie
        // we resolve exactly axios request - NOT axiosInstance's request because it could call recursion
      });
    });

    return retryRequest;
  } else {
    // if error is not related with Unauthorized we just reject promise
    return Promise.reject(error);
  }
});

Work like a charm ! Thanks a lot.

Very nice work. Just a small thing:
line#64, it should be
console.log("Retry with new session context %s request to %s", sourceConfig.method, sourceConfig.url);
otherwise, it returns an error like "method undefined"

Thanks a lot

We have to getting/saving cookie manually because WithCredential axios param use XHR and doesn't work in node.js

Good to know, that's why axios didn't work for me at all. axiosInstance.defaults.headers.Cookie = cookie; did the trick for me.

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Just a question: I've never seen a variable declared and initialized like this in JS: const [cookie] = resp.headers["set-cookie"];. This is just saving the first cookie, right? I've removed the square brackets in [cookie] to deal with multiple cookies at once.

Just a question: I've never seen a variable declared and initialized like this in JS: const [cookie] = resp.headers["set-cookie"];. This is just saving the first cookie, right? I've removed the square brackets in [cookie] to deal with multiple cookies at once.

Sure, its about array destructuring in JavaScript. resp.headers["set-cookie"] returns array with one elem ['yourCookieHere'].
And we can use const [cookie] = resp.headers["set-cookie"]; instead of const cookie = resp.headers["set-cookie"][0];

Very nice work. Just a small thing:
line#64, it should be
console.log("Retry with new session context %s request to %s", sourceConfig.method, sourceConfig.url);
otherwise, it returns an error like "method undefined"

Thanks! fixed

Sure, its about array destructuring in JavaScript. resp.headers["set-cookie"] returns array with one elem ['yourCookieHere'].
And we can use const [cookie] = resp.headers["set-cookie"]; instead of const cookie = resp.headers["set-cookie"][0];

@nzvtrk ah ok, thanks 👍

Have been stuck for 3h and your code works like a charm, thank you so much

It works! Thank you so much.