Monitoring Postgres - Get the SQL queries which are sent to postgres

[Nico Grubert <nicogrubert@xxxxxxxxx>]

Dear list members,

I have a web application running that is connected to my postgres 
database. This web application builds dynamically SQL queries and 
queries the postgres database. I would like to see these SQL queries. 
How can I do this? Is there a way to monitor the SQL queries which are 
sent to my postgres database?

Thanks in advance,
Nico