Youtube API Sample for Project

+const { google } = require("googleapis");
+var http = require('http');
+var opn = require('opn');
+var destroyer = require('destroyer');
+var url = require('url');
+var enableDestroy = require('server-destroy');
+const oauth2Client = new google.auth.OAuth2(
+    "394965702516-q817fn2gj8r8sqoudhp29k1rd71ku42j.apps.googleusercontent.com",
+    "xgo5tcTwsmg2alNumeY1Drj_",
+    "http://localhost:3031/api/oauth2callback"
+);
+
+const scopes = [
+    'https://www.googleapis.com/auth/youtube',
+    'https://www.googleapis.com/auth/youtube.force-ssl',
+    'https://www.googleapis.com/auth/youtube.readonly',
+    'https://www.googleapis.com/auth/youtubepartner'
+];
+
+let refreshToken = '';
+
+async function authenticate() {
+
+    return new Promise((resolve, reject) => {
+
+        if (refreshToken !== "") {
+            oauth2Client.setCredentials({
+                refresh_token: refreshToken
+            });
+
+            oauth2Client.getAccessToken((err, ttoken) => {
+                if (err) {
+                    reject(e);
+                }
+                resolve(oauth2Client);
+            });
+        } else {
+            const authorizeUrl = oauth2Client.generateAuthUrl({
+                access_type: 'offline',
+                scope: scopes.join(' '),
+            });
+            const server = http.createServer(async (req, res) => {
+                try {
+                    if (req.url.indexOf('/api/oauth2callback') > -1) {
+                        const qs = new url.URL(req.url, 'http://localhost:3031').searchParams;
+                        res.end('Completed');
+                        enableDestroy(server);
+                        server.destroy();
+
+                        const {
+                            tokens
+                        } = await oauth2Client.getToken(qs.get('code'));
+                        
+                        refreshToken = tokens.refresh_token;
+                        oauth2Client.credentials = tokens;
+
+                        resolve(oauth2Client);
+                    }
+                } catch (e) {
+                    reject(e);
+                }
+            }).listen(3031, () => {
+
+                opn(authorizeUrl, {
+                    wait: false
+                }).then(cp => cp.unref());
+            });
+
+            destroyer(server);
+        }
+    });
+}
+
+module.exports.refreshClient=authenticate;
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+var {google} =require('googleapis');
+var service = google.youtube('v3');
+const oauth2Service = require('./oauth2');
+
+function getPlaylistData(oauth2Client, channelId) {
+    service.playlists.list({
+        auth: oauth2Client,
+        part: 'id, snippet',
+        fields: 'items(id, snippet(title, description, thumbnails(default(url))))',
+        channelId: channelId
+    }, function(err, response) {
+    if(err) {
+        console.log('The API returned an error: ' + err);
+        return;
+    }
+    var channels = response.data.items;
+        if (channels.length == 0){
+            console.log('No channel found.')
+        } else {
+            console.log(JSON.stringify(channels, null, 4));
+        }
+    });
+}
+
+oauth2Service.refreshClient()
+    .then((client) => {
+        getPlaylistData(client, 'UCx6jsZ02B4K3SECUrkgPyzg');
+    })
+    .catch(console.error);
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