MatrixClient.js

import sdk from 'matrix-js-sdk';
const matrixClient = sdk.createClient({
  baseUrl: process.env.MATRIX_BASE_URL, // https://programination.modular.im
});

  async register(req, res) {
    let sessionId = null;
    const auth = { type: 'm.login.dummy' };
    const name = 'matloob-new';
    const password = 'testing';
    let user = { message: 'Registration Failed!' };
    try {
      await matrixClient.register(name, password, sessionId, auth);
    } catch (e) {
      logger.debug(e, { label: '1. Error registering user on Matrix!' });
      /*
      {
   "name":"Unknown error code",
   "data":{
      "session":"PahfbXbLHhTvcOBtALrdPRAa",
      "flows":[
         {
            "stages":[
               "m.login.recaptcha",
               "m.login.terms",
               "m.login.dummy"
            ]
         },
         {
            "stages":[
               "m.login.recaptcha",
               "m.login.terms",
               "m.login.email.identity"
            ]
         }
      ],
      "params":{
         "m.login.recaptcha":{
            "public_key":"6LcgI54UAAAAABGdGmruw6DdOocFpYVdjYBRe4zb"
         },
         "m.login.terms":{
            "policies":{
               "privacy_policy":{
                  "version":"1.0",
                  "en":{
                     "name":"Privacy Policy",
                     "url":"https://programination.modular.im/_matrix/consent?v=1.0"
                  }
               }
            }
         }
      }
   },
   "httpStatus":401
  }
       */
      if (e.httpStatus === 401) {
        sessionId = e.data.session;
        auth.response = e.data.params['m.login.recaptcha'].public_key;
        auth.type = e.data.flows[0].stages[0];
        auth.session = sessionId;
        console.log(auth, sessionId);
        try {
          user = await matrixClient.register(name, password, sessionId, auth);
          logger.debug(user, { label: '3. Success' });
        } catch (err) {
          logger.debug(err, { label: '2. Error registering user on Matrix!' });
          user = err;
        }
      }
    } finally {
      return res.status(200)
        .send(user);
    }
  },