# "No response object" after split/join

**URL:** <https://discourse.nodered.org/t/no-response-object-after-split-join/63919>\
**Category:** General\
**Created:** [14 June 2022 13:42 UTC](https://discourse.nodered.org/t/no-response-object-after-split-join/63919 "2022-06-14T13:42:32Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![sfrye](https://avatars.discourse-cdn.com/v4/letter/s/7cd45c/32.png) [@sfrye](https://discourse.nodered.org/u/sfrye)\
**Post date:** [14 June 2022 13:42 UTC](https://discourse.nodered.org/t/no-response-object-after-split-join/63919/1 "2022-06-14T13:42:32Z")

</div>

I'm trying my first steps with Node-RED.  
I would like to use the split and join nodes in an HTTP flow, but the `res` property gets lost on join, so my flow fails with the HTTP response node complaining about "no response object".

A simplified example, consisting of four nodes (HTTP In, Split, Join, HTTP Response), using the "reduce sequence" example from the documentation to calculate the average of an array of numbers:

```auto
[
    {
        "id": "9e5f48c16729e4f0",
        "type": "tab",
        "label": "Flow 2",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "f4209033d0b98ad1",
        "type": "join",
        "z": "9e5f48c16729e4f0",
        "name": "",
        "mode": "reduce",
        "build": "object",
        "property": "payload",
        "propertyType": "msg",
        "key": "topic",
        "joiner": "\\n",
        "joinerType": "str",
        "accumulate": true,
        "timeout": "",
        "count": "",
        "reduceRight": false,
        "reduceExp": "$A+payload",
        "reduceInit": "0",
        "reduceInitType": "num",
        "reduceFixup": "$A/$N",
        "x": 530,
        "y": 200,
        "wires": [
            [
                "40982d7b37a20db2"
            ]
        ]
    },
    {
        "id": "40982d7b37a20db2",
        "type": "http response",
        "z": "9e5f48c16729e4f0",
        "name": "",
        "statusCode": "",
        "headers": {},
        "x": 750,
        "y": 200,
        "wires": []
    },
    {
        "id": "d7649e2faf944cea",
        "type": "split",
        "z": "9e5f48c16729e4f0",
        "name": "",
        "splt": "\\n",
        "spltType": "str",
        "arraySplt": 1,
        "arraySpltType": "len",
        "stream": false,
        "addname": "",
        "x": 330,
        "y": 200,
        "wires": [
            [
                "f4209033d0b98ad1"
            ]
        ]
    },
    {
        "id": "de29676d03629e55",
        "type": "http in",
        "z": "9e5f48c16729e4f0",
        "name": "",
        "url": "/avg",
        "method": "post",
        "upload": false,
        "swaggerDoc": "",
        "x": 120,
        "y": 200,
        "wires": [
            [
                "d7649e2faf944cea"
            ]
        ]
    }
]

```

When invoking this with

```auto
curl -d "[2,3,4]" -H "Content-Type: application/json" "http://localhost:1880/avg"

```

I would expect to get "3" as response. Instead, the flow fails with "no response object".  
I can see that the messages sent by the split node still contain the `req` and `res` properties, while the join node sends a message with only the payload and no `req` or `res` properties, which in my understanding is causing the problem.  
What am I doing wrong?

---

<div class="post-metadata">

**Author:** ![E1cid](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/e1cid/32/77971_2.png) [@E1cid](https://discourse.nodered.org/u/E1cid)\
**Post date:** [14 June 2022 13:53 UTC](https://discourse.nodered.org/t/no-response-object-after-split-join/63919/2 "2022-06-14T13:53:51Z")

</div>

The split join is wiping out msg.res.  
Maybe try a different way to get the average. In a change node using JSONata  
e.g

```auto
[{"id":"de29676d03629e55","type":"http in","z":"9e5f48c16729e4f0","name":"","url":"/avg","method":"post","upload":false,"swaggerDoc":"","x":210,"y":260,"wires":[["99333059.1d84d8","5fbb2e71.f07e3"]]},{"id":"99333059.1d84d8","type":"debug","z":"9e5f48c16729e4f0","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":580,"y":360,"wires":[]},{"id":"5fbb2e71.f07e3","type":"change","z":"9e5f48c16729e4f0","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"$average($$.payload)","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":520,"y":260,"wires":[["40982d7b37a20db2"]]},{"id":"92706389.418af8","type":"http request","z":"9e5f48c16729e4f0","name":"","method":"POST","ret":"txt","paytoqs":"ignore","url":"http://192.168.1.25:1880/avg","tls":"","persist":false,"proxy":"","authType":"","x":350,"y":360,"wires":[["99333059.1d84d8"]]},{"id":"40982d7b37a20db2","type":"http response","z":"9e5f48c16729e4f0","name":"","statusCode":"","headers":{},"x":750,"y":200,"wires":[]},{"id":"b82acabf.83fe6","type":"inject","z":"9e5f48c16729e4f0","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"[2,3,4]","payloadType":"json","x":160,"y":360,"wires":[["92706389.418af8"]]}]

```

---

<div class="post-metadata">

**Author:** ![sfrye](https://avatars.discourse-cdn.com/v4/letter/s/7cd45c/32.png) [@sfrye](https://discourse.nodered.org/u/sfrye)\
**Post date:** [14 June 2022 14:09 UTC](https://discourse.nodered.org/t/no-response-object-after-split-join/63919/3 "2022-06-14T14:09:49Z")

</div>

Thank you. Calculating the average was just an example. I was hoping to find a way to use split/join in an HTTP flow.  
You're saying "split join is wiping out msg.res" - but why is it doing that? Is this documented somewhere?

---

<div class="post-metadata">

**Author:** ![E1cid](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/e1cid/32/77971_2.png) [@E1cid](https://discourse.nodered.org/u/E1cid)\
**Post date:** [14 June 2022 14:30 UTC](https://discourse.nodered.org/t/no-response-object-after-split-join/63919/4 "2022-06-14T14:30:58Z")

</div>

You can store msg.res or pass it around the split join.  
e.g.

```auto
[{"id":"de29676d03629e55","type":"http in","z":"bf9e1e33.030598","name":"","url":"/avg","method":"post","upload":false,"swaggerDoc":"","x":310,"y":2080,"wires":[["8bef9ac2.090d98","ab3a1f0c.644358"]]},{"id":"8bef9ac2.090d98","type":"split","z":"bf9e1e33.030598","name":"","splt":"\\n","spltType":"str","arraySplt":1,"arraySpltType":"len","stream":false,"addname":"","x":530,"y":2100,"wires":[["aff68009.2c852"]]},{"id":"ab3a1f0c.644358","type":"change","z":"bf9e1e33.030598","name":"","rules":[{"t":"set","p":"topic","pt":"msg","to":"res","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":670,"y":2040,"wires":[["83cf8d43.d815c8"]]},{"id":"aff68009.2c852","type":"join","z":"bf9e1e33.030598","name":"","mode":"reduce","build":"string","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":false,"timeout":"","count":"","reduceRight":false,"reduceExp":"$A+payload","reduceInit":"0","reduceInitType":"num","reduceFixup":"$A/$N","x":670,"y":2100,"wires":[["5fbb2e71.f07e3"]]},{"id":"83cf8d43.d815c8","type":"join","z":"bf9e1e33.030598","name":"","mode":"custom","build":"object","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":false,"timeout":"","count":"2","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"","reduceFixup":"","x":990,"y":2080,"wires":[["5f7c49b2.30ff5"]]},{"id":"5fbb2e71.f07e3","type":"change","z":"bf9e1e33.030598","name":"","rules":[{"t":"set","p":"topic","pt":"msg","to":"join","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":830,"y":2100,"wires":[["83cf8d43.d815c8"]]},{"id":"5f7c49b2.30ff5","type":"change","z":"bf9e1e33.030598","name":"","rules":[{"t":"move","p":"payload.join","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":1190,"y":2080,"wires":[["40982d7b37a20db2"]]},{"id":"40982d7b37a20db2","type":"http response","z":"bf9e1e33.030598","name":"","statusCode":"","headers":{},"x":1130,"y":2020,"wires":[]},{"id":"b82acabf.83fe6","type":"inject","z":"bf9e1e33.030598","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"[2,3,4]","payloadType":"json","x":260,"y":2180,"wires":[["92706389.418af8"]]},{"id":"92706389.418af8","type":"http request","z":"bf9e1e33.030598","name":"","method":"POST","ret":"txt","paytoqs":"ignore","url":"http://192.168.1.25:1880/avg","tls":"","persist":false,"proxy":"","authType":"","x":450,"y":2180,"wires":[["99333059.1d84d8"]]},{"id":"99333059.1d84d8","type":"debug","z":"bf9e1e33.030598","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":640,"y":2180,"wires":[]}]

```

---

<div class="post-metadata">

**Author:** ![sfrye](https://avatars.discourse-cdn.com/v4/letter/s/7cd45c/32.png) [@sfrye](https://discourse.nodered.org/u/sfrye)\
**Post date:** [14 June 2022 14:48 UTC](https://discourse.nodered.org/t/no-response-object-after-split-join/63919/5 "2022-06-14T14:48:05Z")

</div>

Ok, thanks for the workaround.  
If someone can explain why this is necessary (i.e., why can't `join` pass on `msg.res`?), I would be very interested.

---

<div class="post-metadata">

**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [14 June 2022 18:42 UTC](https://discourse.nodered.org/t/no-response-object-after-split-join/63919/6 "2022-06-14T18:42:41Z")

</div>

Not sure it's necessary - possibly a bug. BUT I would only expect it work (easily) if using a split as well - so that every part has a .res on. I suspect it may be very easy to end up sending multiple res messages to the response node which would also cause a failure... but probably worth raising an issue to log it so we can investigate.

---

<div class="post-metadata">

**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [15 June 2022 09:21 UTC](https://discourse.nodered.org/t/no-response-object-after-split-join/63919/7 "2022-06-15T09:21:28Z")

</div>

Added possible PR here - [Join node in reduce mode doesn't keep existing msg properties by dceejay · Pull Request #3670 · node-red/node-red · GitHub](https://github.com/node-red/node-red/pull/3670)

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [14 August 2022 09:22 UTC](https://discourse.nodered.org/t/no-response-object-after-split-join/63919/8 "2022-08-14T09:22:02Z")

</div>

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