uploadVideo.js

const http = require('http')
const url = require('url')
const { google } = require('googleapis')
const fs = require('fs')
const { web: credentials } = require('./client_secret.json')

const oauth2Client = new google.auth.OAuth2(
  credentials.client_id,
  credentials.client_secret,
  'http://localhost:3000' // this is our redirect url for the authorization.
)

const scopes = ['https://www.googleapis.com/auth/youtube.upload']
const authorizationUrl = oauth2Client.generateAuthUrl({
  access_type: 'online',
  scope: scopes,
  include_granted_scopes: true
})
http.createServer(async function (req, res) {
  if (req.url == '/') {
    res.writeHead(301, { Location: authorizationUrl })
    res.end()
  }
  if (req.url.includes('code')) {
    let q = url.parse(req.url, true).query
    if (q.error) {
      console.log('Error:' + q.error)
    } else {
      let { tokens } = await oauth2Client.getToken(q.code)
      oauth2Client.setCredentials(tokens)
      userCredential = tokens

      const service = google.youtube({
        version: 'v3'
      })

      service.videos.insert(
        {
          auth: oauth2Client,
          part: 'snippet,status',
          requestBody: {
            snippet: {
              title: 'My video title',
              description: 'My video description',
              tags: 'tag1,tag2,tag3',
              categoryId: 1, // you can check from https://gist.github.com/dgp/1b24bf2961521bd75d6c
              defaultLanguage: 'en',
              defaultAudioLanguage: 'en'
            },
            status: {
              privacyStatus: 'private'
            }
          },
          media: {
            body: fs.createReadStream('video.mp4')
          }
        },
        function (err, response) {
          if (err) {
            console.log('The API returned an error: ' + err)
            return
          }
          // Video is uploaded here
        }
      )
    }
  }
})