Passport-Facebook authentication is not providing email for all Facebook accounts

Question

I am using Passport-Facebook authentication.

  passport.use(new FacebookStrategy({
            clientID: \'CLIENT_ID\',
            clientSecret: \'CLIENT_SECRET\         


        

Answer 1

When passport doesn't return the profile.emails, profile.name.givenName, profile.name.familyName fields, or if they are missing, you can try to parse the https://graph.facebook.com/v3.2/ url, although you still need a token. You access the url, with of course a valid token, like:

https://graph.facebook.com/v3.2/me?fields=id,name,email,first_name,last_name&access_token=

It outputs a JSON response like:

{
   "id": "5623154876271033",
   "name": "Kurt Van den Branden",
   "email": "kurt.vdb\u0040example.com",
   "first_name": "Kurt",
   "last_name": "Van den Branden"
}

Install the request module ($ npm install request --save), to be able to parse a JSON url and in your passport.js file:

const request = require("request");

passport.use(new FacebookStrategy({
        clientID        : 'CLIENT_ID',
        clientSecret    : 'CLIENT_SECRET',
        callbackURL     : "https://example.com/auth/facebook/callback"
    },
    function(req, token, profile, done) {

        let url = "https://graph.facebook.com/v3.2/me?" +
                  "fields=id,name,email,first_name,last_name&access_token=" + token;

        request({
            url: url,
            json: true
        }, function (err, response, body) {
              let email = body.email;  // body.email contains your email
              console.log(body); 
        });
    }
));

You can add a lot of other parameters to the url, although some of them require user permission to return values. You can play with it on: https://developers.facebook.com/tools/explorer/