Can I use PostgreSQL (pg) in the client-side (express/node.js)

I want to use PostgreSQL in the client side. is that possible? can i have this code?

in my server.js

   var pg = require('pg');

in my client side

     var conString = "postgres://postgres:pass@localhost/mydb";
     var client = new pg.Client(conString);
     client.connect();
     var query = client.query("SELECT * FROM users ");        
     query.on('row', function(row) {
             alert(row.name);
     });

i tried this code but nothing happened. though can i have a code similar to this, where i connect PostgreSQL and use queries on the client scripts.