Getting Tableau data from Node.js

app.js

//We use this code to retrieve data directly from Tableau server 10.1 from our Node.js server
//This is just a simplified example, not the actual code :)

// You need to fill in all the things in < >   
const tableauServer = 'https://<IP OF YOUR SERVER>/trusted';
const username = '<username of a valid user to view the data>';
const reportPath = '/views/<WORKBOOK>/<view>';
const request = require('request-promise-native');
//This is optional, you can add filter parameters directly into the URL
//Check if you need to URI encode the parameter value
//You can have more than one parameter, this is a regular query string
const parameters = `${encodeURIComponent('<Parameter name>')}=<Paramter value>`; 
        
//Note, you will need to configure your server to accept trusted connection from the IP of the server running this code.
//See this: https://onlinehelp.tableau.com/current/server/en-us/trusted_auth.htm
function getTrustedTicket(server, username) {
        return request({
            method: 'POST',
            uri: `${server}?username=${username}`,
            rejectUnauthorized: false
        })
            .then((ticket) => {
                if (ticket.toString() === '-1') {
                    const errorMessage = 'Tableau server did not return a ticket!';
                    throw new Error(errorMessage);
                }
                return ticket;
            });
    }

    getTrustedTicket(tableauServer, username)
       .then((ticket) => {
           //Note that I ask for the data as CSV to avoid all the iFrame shananigans 
            const vizUrl = `${tableauServer}/${ticket}${reportPath}.csv?${parameters}`;
            return request({
                 method: 'GET',
                 uri: vizUrl,
                 rejectUnauthorized: false
             });
         })
         .then((csvData) => {
              res.send(csvData);
          })
          .catch((err) => {
                console.log(err);
                res.send();
            });