Question

I am using node.js for my application and I have to do user authentication via google. I have seen passport-google module but I did not get any idea from that and there is no variable for username and password.

One thing is that My application is desktop application .

Answer 1

You can either do it through OAuth or OpenID for both cases there are very detail examples on passport.js what else you need

for OAuth Example
https://github.com/jaredhanson/passport-google-oauth/blob/master/examples/oauth2/app.js

for OpenID Example (deprecated)
https://github.com/jaredhanson/passport-google/blob/master/examples/signon/app.js

I think they are quite self explantory..