DocuSign NODE SDK Example - Get OAuth access token

getAuthToken.js

// Configure Passport
passport.use(new docusign.OAuthClient({
  sandbox: true,
  clientID: '{CLIENT_ID}',
  clientSecret: '{CLIENT_SECRET}',
  callbackURL: hostUrl + '/auth/callback'
},
  function (accessToken, refreshToken, user, done) {
    // Here we're just assigning the tokens to the user profile object but we
    // could be using session storage or any other form of transient-ish storage
    user.accessToken = accessToken;
    user.refreshToken = refreshToken;
    return done(null, user);
  }
));

app.get('/auth', function (req, res) {
  passport.authenticate('docusign'/*, {state: 'optional state'}*/)(req, res);
});

app.get('/auth/callback', function (req, res) {
  passport.authenticate('docusign'/*, {state: 'optional state'}*/, function (err, user) {
    if (err) {
      return res.send(err);
    }
    if (!user) {
      return res.redirect('/auth');
    }

    // getting the API client ready
    var apiClient = new docusign.ApiClient();
    // currently pointing to demo (sandbox) environment
    var RestApiUrl = 'https://demo.docusign.net/restapi';
    apiClient.setBasePath(RestApiUrl);
    apiClient.addDefaultHeader('Authorization', 'Bearer ' + user.accessToken);
    console.log("API Client configured with new access_token!");
  })(req, res);
});