# missing producerId on consumer

**URL:** <https://mediasoup.discourse.group/t/missing-producerid-on-consumer/2404>\
**Category:** mediasoup-demo\
**Created:** [February 3, 2021, 11:38am UTC](https://mediasoup.discourse.group/t/missing-producerid-on-consumer/2404 "2021-02-03T11:38:07Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![artvan](https://avatars.discourse-cdn.com/v4/letter/a/8dc957/32.png) [@artvan](https://mediasoup.discourse.group/u/artvan)\
**Post date:** [February 3, 2021, 11:38am UTC](https://mediasoup.discourse.group/t/missing-producerid-on-consumer/2404/1 "2021-02-03T11:38:07Z")

</div>

I need some pointers with the producerId when creating a consume.  
[https://mediasoup.org/documentation/v3/mediasoup/api/#transport-consume](https://mediasoup.org/documentation/v3/mediasoup/api/#transport-consume)

take for example the code to create a video track producer

```auto
echo ">>> creating mediasoup video Producer..."

res=$(${HTTPIE_COMMAND} \
	POST ${SERVER_URL}/rooms/${ROOM_ID}/broadcasters/${BROADCASTER_ID}/transports/${videoTransportId}/producers \
	kind="video" \
	rtpParameters:="{ \"codecs\": [{ \"mimeType\":\"video/vp8\", \"payloadType\":${VIDEO_PT}, \"clockRate\":90000 }], \"encodings\": [{ \"ssrc\":${VIDEO_SSRC} }] }" \
    )

eval "$(echo ${res} | jq -r '@sh "producerId=\(.id)"')"

echo "Video producerId:"${producerId}
Video producerId:2e84c688-7d7d-44f4-90e0-0e92079881b5

```

is it correct to now use that reference when creating the video consumer

```auto
    ${HTTPIE_COMMAND} -v \
    POST ${SERVER_URL}/rooms/${ROOM_ID}/broadcasters/${BROADCASTER_ID}/transports/${videoTransportId}/consume \
    producerId="2e84c688-7d7d-44f4-90e0-0e92079881b5" 

```

my assumptions on the above POST command variables are referencing the consumer.

```auto
${BROADCASTER_ID}
${videoTransportId}

```

So now I get a returned error

```auto
POST /rooms/testme3/broadcasters/eyfzU6h464Breuw8kBHyJ7OOWZMoaaa/transports/e91b2307-2197-4462-a69f-c958acb24bd2/consume HTTP/1.1
Accept: application/json, */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Length: 54
Content-Type: application/json
Host: gst.nxgn.link:4443
User-Agent: HTTPie/0.9.8

{
    "producerId": "2e84c688-7d7d-44f4-90e0-0e92079881b5"
}

HTTP/1.1 400 missing producerId
Connection: keep-alive
Content-Length: 29
Content-Type: text/html; charset=utf-8
Date: Wed, 03 Feb 2021 11:07:25 GMT
ETag: W/"1d-uGdbc12KurUIaTDKO43P260k/ns"
X-Powered-By: Express

TypeError: missing producerId

```

I did not find a reference to this constructed error in the Rooms.js file

Can someone point me to where / how this error is being reported and if I am using the incorrect parameter in the POST call.

---

<div class="post-metadata">

**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [February 3, 2021, 11:52am UTC](https://mediasoup.discourse.group/t/missing-producerid-on-consumer/2404/2 "2021-02-03T11:52:19Z")

</div>

Please do not focus on the mediasoup demo. It’s not supposed to be a production grade application at all.

I don’t reply to questions about the mediasoup-mode usage, so this is an exception:

```auto
expressApp.post(
		'/rooms/:roomId/broadcasters/:broadcasterId/transports/:transportId/consume',
		async (req, res, next) =>
		{
			const { broadcasterId, transportId } = req.params;
			const { producerId } = req.query;

```

The `producerId` must be given in the URL query params rather than in the POST body. Why? because the demo is done that way.

---

<div class="post-metadata">

**Author:** ![artvan](https://avatars.discourse-cdn.com/v4/letter/a/8dc957/32.png) [@artvan](https://mediasoup.discourse.group/u/artvan)\
**Post date:** [February 3, 2021, 12:15pm UTC](https://mediasoup.discourse.group/t/missing-producerid-on-consumer/2404/3 "2021-02-03T12:15:59Z")

</div>

thanks @ibc, I am actually building my own interface, but try to go back to the demo as a common example code if I cannot get my interface to work.

I missed in the httpie spec that a query param should be ==  
so for others hitting the issue, I adjusted the app string in the demo app to

```auto
    ${HTTPIE_COMMAND} -v \
    POST ${SERVER_URL}/rooms/${ROOM_ID}/broadcasters/${BROADCASTER_ID}/transports/${videoTransportId}/consume \
    producerId=="7e5796f7-4e97-482f-bfd7-3466e5693f64" 

```