Example for downloading a file from google drive api using Node.js

index.js

// npm install googleapis@105 @google-cloud/local-auth@2.1.0 --save

const fs = require('fs');
const fsp = fs.promises;


const path = require('path');
const process = require('process');
const {authenticate} = require('@google-cloud/local-auth');
const {google} = require('googleapis');

// If modifying these scopes, delete token.json.
const SCOPES = ['https://www.googleapis.com/auth/drive'];
// File id of the file to download
const FILEID = 'SetFileIdHere';


// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
const TOKEN_PATH = path.join(process.cwd(), 'DownloadFileToken.json');
const CREDENTIALS_PATH = 'C:\\Development\\FreeLance\\GoogleSamples\\Credentials\\CredWebEverything.json';

/**
 * Reads previously authorized credentials from the save file.
 *
 * @return {Promise<OAuth2Client|null>}
 */
async function loadSavedCredentialsIfExist() {
    try {
        const content = await fsp.readFile(TOKEN_PATH);
        const credentials = JSON.parse(content);
        return google.auth.fromJSON(credentials);
    } catch (err) {
        return null;
    }
}

/**
 * Serializes credentials to a file compatible with GoogleAUth.fromJSON.
 *
 * @param {OAuth2Client} client
 * @return {Promise<void>}
 */
async function saveCredentials(client) {
    const content = await fsp.readFile(CREDENTIALS_PATH);
    const keys = JSON.parse(content);
    const key = keys.installed || keys.web;
    const payload = JSON.stringify({
        type: 'authorized_user',
        client_id: key.client_id,
        client_secret: key.client_secret,
        refresh_token: client.credentials.refresh_token,
    });
    await fsp.writeFile(TOKEN_PATH, payload);
}

/**
 * Load or request or authorization to call APIs.
 *
 */
async function authorize() {
    let client = await loadSavedCredentialsIfExist();
    if (client) {
        return client;
    }
    client = await authenticate({
        scopes: SCOPES,
        keyfilePath: CREDENTIALS_PATH,
    });
    if (client.credentials) {
        await saveCredentials(client);
    }
    return client;
}


/**
 * Download file
 * @param {OAuth2Client} authClient An authorized OAuth2 client.
 */
async function downloadFile(authClient) {

    const service = google.drive({version: 'v3', auth: authClient});

    fileId = FILEID;
    try {

        // get the file name
        const fileMetaData = await service.files.get({
                fileId: fileId, fields: 'name'
            },
        );

        // create stream writer with the file name from drive
        const fileStream = fs.createWriteStream(fileMetaData.data.name)
        console.log('downloading: ' + fileMetaData.data.name);

        const file = await service.files.get({
            fileId: fileId,
            alt: 'media',
        }, {
                responseType: "stream"
            }
        );

        file.data.on('end', () => console.log('onCompleted'))
        file.data.pipe(fileStream);

    } catch (err) {
        // TODO(developer) - Handle error
        throw err;
    }
}

authorize().then(downloadFile).catch(console.error);