Getting message in ibmmq Node.js

I'm using ibmmq module https://github.com/ibm-messaging/mq-mqi-nodejs

I need to get an xml message from a queue and than make an xsl-transformation. I put messages to the queue with JMeter and if I browse messages in rfhutil I can see them as is on the Data tab. But when I get it in the code

 function getCB(err, hObj, gmo,md,buf, hConn ) {
   // If there is an error, prepare to exit by setting the ok flag to false.
   if (err) {...
   } else {
     if (md.Format=="MQSTR") {
       console.log("message <%s>", decoder.write(buf));
     } else {
       console.log("binary message: " + buf);
     }
  }

I get my message with some service information:

buf=RFH �"�MQSTR � <mcd><Msd>jms_text</Msd></mcd> X<jms><Dst>queue://MY_QM/MY_QUEUE</Dst><Tms>1657791724648</Tms><Dlv>2</Dlv></jms> ...My_message...

How can I get only My message like I do in rfhutil? I can get it with string methods, but it looks like crutches.

Solution

That message has the headers created by a JMS application. There are various ways of dealing with it. You can

Have the sending app disable sending that structure (setting the targClient property)
Use GMO options to ignore the properties (MQGMO_NO_PROPERTIES)
Have your application deal with the RFH2 stucture. See for example the amqsget.js sample in the Node.js repo which includes this fragment:

    switch (format) {
      case MQC.MQFMT_RF_HEADER_2:
        hdr   = mq.MQRFH2.getHeader(buf);