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2 Click to overview and then back to credentials Now follow instructions as usual a. At the top of the page, select the OAuth consent screen tab. Select an address, enter a Product name if not already set, and click the Save button. b. Select the Credentials tab, click the Create credentials button and select OAuth client ID. c. Select the application type Other, enter the name "Google Sheets API Quickstart", and click the Create button. d. Click OK to dismiss the resulting dialog. e. Click the file_download (Download JSON) button to the right of the client ID. f. Move this file to your working directory and rename it client_secret.json. Step 2: Install the client library Run the following commands to install the libraries using npm:

3 npm install googleapis --save npm install google-auth-library --save Step 3: Set up the sample Create a file named quickstart.js in your working directory and copy in the following 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/sheets.googleapis.com-nodejs-quickstart.json var SCOPES = [' var TOKEN_DIR = (process.env.home process.env.homepath process.env.userprofile) + '/.credentials/'; var TOKEN_PATH = TOKEN_DIR + 'sheets.googleapis.com-nodejsquickstart.json'; // Load client secrets from a local file. fs.readfile('client_secret.json', function processclientsecrets(err, content) { console.log('error loading client secret file: ' + err); return; // Authorize a client with the loaded credentials, then call the // Google Sheets API. authorize(json.parse(content), listmajors); ); Create an OAuth2 client with the given credentials, and then execute the given callback function.

4 @param {Object credentials The authorization client {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) { 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 {google.auth.oauth2 oauth2client The OAuth2 client to get token {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 );

5 rl.question('enter the code from that page here: ', function(code) { rl.close(); oauth2client.gettoken(code, function(err, token) { 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 {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); Print the names and majors of students in a sample spreadsheet: OgvE2upms/edit / function listmajors(auth) { var sheets = google.sheets('v4'); sheets.spreadsheets.values.get({ auth: auth, spreadsheetid: '1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms', range: 'Class Data!A2:E',

6 , function(err, response) { console.log('the API returned an error: ' + err); return; var rows = response.values; if (rows.length == 0) { console.log('no data found.'); else { console.log('name, Major:'); for (var i = 0; i < rows.length; i++) { var row = rows[i]; // Print columns A and E, which correspond to indices 0 and 4. console.log('%s, %s', row[0], row[4]); ); Step 4: Run the sample Run the sample using the following command: node quickstart.js The first time you run the sample, it will prompt you to authorize access: a. Browse to the provided URL in your web browser. If you are not already logged into your Google account, you will be prompted to log in. If you are logged into multiple Google accounts, you will be asked to select one account to use for the authorization. b. Click the Accept button. c. Copy the code you're given, paste it into the command-line prompt, and press Enter.

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