access google+ API from node.js ♥ George Opritescu

Steps:

enable Google+ API in google console
create credentials for 1 Web Application
here’s the code snippet I used to obtain the code:

const google = require('googleapis');
const dotenv = require("dotenv").config();
const exec = require('child_process').exec;
const util = require("util");

const readline = require('readline');
const rl = readline.createInterface(process.stdin, process.stdout);

let client_id = process.env.GOOGLE_APP_CLIENT_ID,
  client_secret = process.env.GOOGLE_APP_CLIENT_SECRET;

let app_google_auth_url = process.env.GOOGLE_APP_AUTH_URL;
let client = new google.auth.OAuth2(client_id, client_secret, app_google_auth_url);

console.log(`client_id ${client_id} client_secret ${client_secret} oauth_url ${app_google_auth_url}`);

let scopes = [
  'https://www.googleapis.com/auth/plus.me'
];

let url = client.generateAuthUrl({
  access_type: 'offline',
  scope: scopes
});

console.log(`URL:${url}`);

rl.setPrompt('enter authorization code here> ');
rl.prompt();
rl.on('line', function(line) {
  client.getToken(line, function(err, tokens) {
    if(!err) {
      console.log(util.inspect(tokens));
    }
    process.exit(0);
  });
}).on('close',function(){
  process.exit(0);
});

I’m using 1 dotenv for node in this example, and I had the values for client_id, client_secret, and the redirect url mentioned there.
at some point, the application will show the URL in the console, copy it and visit it in your browser
google will redirect to your registered application URL with a 1 code parameter. Write that down, paste it, and press enter. For this purpose, I had a rails app running in the background, with a 1 binding.pry so that I could inspect what’s sent as 1 params.
you will then see in the console the access_token, refresh_token and expiry_date. Those you can use when you make the API calls.