The rabbitmqctl command with the list_queues option can be used to list a virtual hosts queues and the number of messages in each queue.

rabbitmqctl list_queues

Which should produce something like this. By default, if the -p option is not used, the / virtual host will be used.

Listing queues for vhost / ...
name     messages
queue001 0
queue002 0

The -p option can be used to specify a virtual host, like this.

rabbitmqctl list_queues --vhost vhost001

Which should produce something like this.

Listing queues for vhost vhost001
name     messages
queue001 0
queue002 17

You can specify the items you wish to include in the output, like this.

rabbitmqctl list_queues name state messages messages_ready --vhost vhost001

Which should produce something like this.

Listing queues for vhost vhost001
name     state    messages messages_ready message_bytes_ready
queue001 running  0        0              0
queue002 running  17       17             157754

The --formatter json option can be used to return the output in JSON.

rabbitmqctl list_queues --formatter json