Take a look at IBM MQ

IBM MQ provides the ability to view messages without removing them from the queue. You can start viewing messages from the beginning and repeat all messages in the queue. You can also view a specific message using MessageId or CorrelationId.

Here is a snippet in C # to view the messages in the queue.

    /// <summary>
    /// Browse messages in a queue
    /// </summary>
    private void BrowseMessages()
    {
        MQQueueManager qm = null;
        MQQueue queueGet = null;
        Hashtable mqProps = null;

        try
        {
            mqProps = new Hashtable();
            // Setup properties for connection
            mqProps.Add(MQC.TRANSPORT_PROPERTY, MQC.TRANSPORT_MQSERIES_MANAGED);
            mqProps.Add(MQC.HOST_NAME_PROPERTY, "localhost");
            mqProps.Add(MQC.PORT_PROPERTY, 1414);
            mqProps.Add(MQC.CHANNEL_PROPERTY, "QM.SVRCONN");

            // Open connection to queue manager
            qm = new MQQueueManager("QM", mqProps);

            // Open queue for browsing
            queueGet = qm.AccessQueue("Q1", MQC.MQOO_BROWSE | MQC.MQOO_FAIL_IF_QUIESCING);

            // In a loop browse all messages till we reach end of queue
            while (true)
            {
                try
                {
                    // Need to create objects everytime
                    MQMessage msg = new MQMessage();
                    MQGetMessageOptions gmo = new MQGetMessageOptions();

                    // Use browse next option to start browsing
                    gmo.Options = MQC.MQGMO_BROWSE_NEXT;
                    queueGet.Get(msg, gmo);
                    Console.WriteLine(msg.ReadString(msg.MessageLength));
                }
                catch (MQException mqex)
                {
                    // When there are no more messages to browse, the Get call
                    // will throw MQException with reason code MQC.MQRC_NO_MSG_AVAILABLE.
                    // But here we close the queue and break out of loop for all exceptions
                    queueGet.Close();
                    break;
                }
            }
            qm.Disconnect();
        }
        catch (MQException mqex)
        {
            Console.WriteLine(mqex);
        }
    }