Save the data of a postgresql query in javascript?

I am using Nodejs, for the postgresql part I am using pg-promise. The query is performed with the following function, but I would like to save the data variable, which is the one with the values of the query, so I can use them later.

    function getUnUsuario2(req, res, next) {
  var pupID = req.body.usuario;
  db.any('select * from tienda.usuarioadmin where nombre_usuario= $1', pupID)
    .then(function (data) {
      localStorage.Usuariosa=data;
      if(data[0]==null){
       res.status(200)
        .json({
          status: 'No existe D:'
        }); 

  }


 else {
res.redirect (' link ');
      } 

    })


.catch(function (err) {
  return next(err);
});
     

}