google api , using a refresh token to get the access token

 

router.get('/refresh',function(req,res){

  oauth2Client.credentials = { refresh_token: '1/RqVyL7yLBxwsCA4h5IzDJuMVcCwX3munQz1ntGyg99I'};

  oauth2Client.refreshAccessToken(function(err, tokens){

    res.send({

      access_token: tokens.access_token,

      token:tokens

    });

  });

});