title: youtube data-api node.js quickstart
body: <p>this is the error i'm getting after following the </p>
  
  <p><a href="https://developers.google.com/youtube/v3/quickstart/nodejs" rel="nofollow noreferrer">https://developers.google.com/youtube/v3/quickstart/nodejs</a>
  tutorial.</p>
  
  <pre><code> var auth = new googleAuth();
                 ^
  
  TypeError: googleAuth is not a constructor
      at authorize (C:\Users\gdarmon\Desktop\youtube\index.js:34:16)
      at processClientSecrets (C:\Users\gdarmon\Desktop\youtube\index.js:20:5)
      at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:511:3)
  </code></pre>
  
  <p>I tried 2 suggested solutions:
  <Br>
  a. </p>
  
  <pre><code>npm uninstall google-auth-library --save&lt;br&gt;
  npm install google-auth-library@0.12.0 --save&lt;br&gt;
  </code></pre>
  
  <p>which </p>
  
  <p>cause the application to return <br>
  <strong>The API returned an error: Error: Required parameter: part</strong></p>
  
  <p>b. create <code>const { GoogleAuth } = require('google-auth-library');</code><br>
  which then causes another error </p>
  
  <pre><code> var oauth2Client = new auth.OAuth2(clientId, clientSecret, redirectUrl);
                         ^
  
  TypeError: auth.OAuth2 is not a constructor
  </code></pre>
  
  <p>Can you please help ?
  this is the full code from the tutorial </p>
  
  <pre><code>var fs = require('fs');
  var readline = require('readline');
  var google = require('googleapis');
  var googleAuth = require('google-auth-library');
  
  // If modifying these scopes, delete your previously saved credentials
  // at ~/.credentials/youtube-nodejs-quickstart.json
  var SCOPES = ['https://www.googleapis.com/auth/youtube.readonly'];
  var TOKEN_DIR = (process.env.HOME || process.env.HOMEPATH ||
      process.env.USERPROFILE) + '/.credentials/';
  var TOKEN_PATH = TOKEN_DIR + 'youtube-nodejs-quickstart.json';
  
  // Load client secrets from a local file.
  fs.readFile('client_secret.json', function processClientSecrets(err, content) {
      if (err) {
          console.log('Error loading client secret file: ' + err);
          return;
      }
      // Authorize a client with the loaded credentials, then call the YouTube API.
      authorize(JSON.parse(content), getChannel);
  });
  
  /**
   * Create an OAuth2 client with the given credentials, and then execute the
   * given callback function.
   *
   * @param {Object} credentials The authorization client credentials.
   * @param {function} callback The callback to call with the authorized client.
   */
  function authorize(credentials, callback) {
      var clientSecret = credentials.installed.client_secret;
      var clientId = credentials.installed.client_id;
      var redirectUrl = credentials.installed.redirect_uris[0];
      var auth = new googleAuth();
      var oauth2Client = new auth.OAuth2(clientId, clientSecret, redirectUrl);
  
      // Check if we have previously stored a token.
      fs.readFile(TOKEN_PATH, function (err, token) {
          if (err) {
              getNewToken(oauth2Client, callback);
          } else {
              oauth2Client.credentials = JSON.parse(token);
              callback(oauth2Client);
          }
      });
  }
  
  /**
   * Get and store new token after prompting for user authorization, and then
   * execute the given callback with the authorized OAuth2 client.
   *
   * @param {google.auth.OAuth2} oauth2Client The OAuth2 client to get token for.
   * @param {getEventsCallback} callback The callback to call with the authorized
   *     client.
   */
  function getNewToken(oauth2Client, callback) {
      var authUrl = oauth2Client.generateAuthUrl({
          access_type: 'offline',
          scope: SCOPES
      });
      console.log('Authorize this app by visiting this url: ', authUrl);
      var rl = readline.createInterface({
          input: process.stdin,
          output: process.stdout
      });
      rl.question('Enter the code from that page here: ', function (code) {
          rl.close();
          oauth2Client.getToken(code, function (err, token) {
              if (err) {
                  console.log('Error while trying to retrieve access token', err);
                  return;
              }
              oauth2Client.credentials = token;
              storeToken(token);
              callback(oauth2Client);
          });
      });
  }
  
  /**
   * Store token to disk be used in later program executions.
   *
   * @param {Object} token The token to store to disk.
   */
  function storeToken(token) {
      try {
          fs.mkdirSync(TOKEN_DIR);
      } catch (err) {
          if (err.code != 'EEXIST') {
              throw err;
          }
      }
      fs.writeFile(TOKEN_PATH, JSON.stringify(token));
      console.log('Token stored to ' + TOKEN_PATH);
  }
  
  /**
   * Lists the names and IDs of up to 10 files.
   *
   * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
   */
  function getChannel(auth) {
      var service = google.youtube('v3');
      service.channels.list({
          auth: auth,
          part: 'snippet,contentDetails,statistics',
          forUsername: 'GoogleDevelopers'
      }, function (err, response) {
          if (err) {
              console.log('The API returned an error: ' + err);
              return;
          }
          var channels = response.items;
          if (channels.length == 0) {
              console.log('No channel found.');
          } else {
              console.log('This channel\'s ID is %s. Its title is \'%s\', and ' +
                          'it has %s views.',
                          channels[0].id,
                          channels[0].snippet.title,
                          channels[0].statistics.viewCount);
          }
      });
  }
  </code></pre>