遵循YouTube Data API Node.js快速入门教程遇构造函数错误求助

I’ve run into this exact issue before—this happens because the official quickstart tutorial uses code written for old versions of google-auth-library (v0.x), but npm now installs the latest v2+ version by default, which has a completely different API structure. Let’s break down why your two attempts didn’t work, then fix it properly.

Why Your Previous Fixes Failed #

1. Downgrading to google-auth-library@0.12.0:
   You only downgraded the auth library, but didn’t match it with a compatible version of googleapis. Newer googleapis versions expect different parameter formatting, which caused the Required parameter: part error (even though your code includes the part parameter—version mismatch broke the API call).

2. Using const { GoogleAuth } = require('google-auth-library');:
   The newer library doesn’t expose OAuth2 as a property of a GoogleAuth instance. Instead, you need to import OAuth2Client directly, which is why you got the TypeError: auth.OAuth2 is not a constructor error.

Solution 1: Use the Latest Libraries (Recommended) #

This is the best approach since old library versions have security vulnerabilities. Here’s how to update your code:

Step 1: Install Latest Dependencies

npm install googleapis google-auth-library --save

Step 2: Update Your Code

Replace the relevant parts of your code with these changes:

• Replace the old auth library import with the new OAuth2Client import
• Rewrite the authorize function to use the new client directly

Here’s the full updated code:

var fs = require('fs');
var readline = require('readline');
var google = require('googleapis');
// Updated import for the latest auth library
const { OAuth2Client } = 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];
  // Use OAuth2Client directly instead of googleAuth constructor
  var oauth2Client = new OAuth2Client(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);
    }
  });
}

Solution 2: Use Compatible Old Versions (If You Want to Keep the Original Code) #

If you prefer to use the exact code from the tutorial, you need to install versions of googleapis and google-auth-library that work together:

npm uninstall googleapis google-auth-library --save
npm install googleapis@27 google-auth-library@0.12.0 --save

This will match the versions the tutorial was written for, and your original code will run without errors (no need to modify any code).

内容的提问来源于stack exchange，提问作者Gilad