# Output wrong topic name

**URL:** <https://discourse.nodered.org/t/output-wrong-topic-name/63090>\
**Category:** General\
**Created:** [26 May 2022 07:15 UTC](https://discourse.nodered.org/t/output-wrong-topic-name/63090 "2022-05-26T07:15:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Kundepuu](https://avatars.discourse-cdn.com/v4/letter/k/bcef8e/32.png) [@Kundepuu](https://discourse.nodered.org/u/Kundepuu)\
**Post date:** [26 May 2022 07:15 UTC](https://discourse.nodered.org/t/output-wrong-topic-name/63090/1 "2022-05-26T07:15:01Z")

</div>

There is 4 input and output the min value and name of sensor.  
As in pic min is 1, but sensor name is "sensor4", but it should be "sensor4".  
cant figure how to fix

 ![problem1](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/c/f/cff25cc26aab1e602b2d663d941a18716e74100b.png)  
[flows (9).json](https://discourse.nodered.org/uploads/short-url/tJXgWsuP3pqaRClELm4Bd99wbLL.json) (5.2 KB)

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<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:** [26 May 2022 07:45 UTC](https://discourse.nodered.org/t/output-wrong-topic-name/63090/2 "2022-05-26T07:45:12Z")

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The join node will output the last topic it receives, you would need to store the topic in the message, and alter it after the join.  
e.g

```auto
[{"id":"10dc67b7f1544cfd","type":"inject","z":"4c74a996ec0dcce6","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":"0.1","topic":"sensor1","payload":"1","payloadType":"num","x":170,"y":80,"wires":[["b7ed48e0.8ad26"]]},{"id":"b7ed48e0.8ad26","type":"change","z":"4c74a996ec0dcce6","name":"","rules":[{"t":"move","p":"payload","pt":"msg","to":"payload.value","tot":"msg"},{"t":"set","p":"payload.sensor","pt":"msg","to":"topic","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":480,"y":60,"wires":[["9b80fac1.4d62e8"]]},{"id":"09f774e5a20bce7e","type":"inject","z":"4c74a996ec0dcce6","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":"0.1","topic":"sensor2","payload":"2.1","payloadType":"num","x":170,"y":120,"wires":[["b7ed48e0.8ad26"]]},{"id":"a3b77181baac77bf","type":"inject","z":"4c74a996ec0dcce6","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":"0.1","topic":"sensor3","payload":"5.7","payloadType":"num","x":170,"y":160,"wires":[["b7ed48e0.8ad26"]]},{"id":"40641e8232f9c750","type":"inject","z":"4c74a996ec0dcce6","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":"0.1","topic":"sensor4","payload":"7.2","payloadType":"num","x":170,"y":200,"wires":[["b7ed48e0.8ad26"]]},{"id":"9b80fac1.4d62e8","type":"join","z":"4c74a996ec0dcce6","name":"","mode":"custom","build":"object","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":false,"timeout":"","count":"4","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"num","reduceFixup":"","x":490,"y":120,"wires":[["9d32943.7172068"]]},{"id":"9d32943.7172068","type":"change","z":"4c74a996ec0dcce6","name":"change","rules":[{"t":"set","p":"payload","pt":"msg","to":"$$.payload.*^(value)[0]","tot":"jsonata"},{"t":"move","p":"payload.sensor","pt":"msg","to":"topic","tot":"msg"},{"t":"move","p":"payload.value","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":420,"y":180,"wires":[["7a83392268023e11"]]},{"id":"7a83392268023e11","type":"switch","z":"4c74a996ec0dcce6","name":"","property":"topic","propertyType":"msg","rules":[{"t":"eq","v":"sensor1","vt":"str"},{"t":"eq","v":"sensor2","vt":"str"},{"t":"eq","v":"sensor3","vt":"str"},{"t":"eq","v":"sensor4","vt":"str"}],"checkall":"true","repair":false,"outputs":4,"x":430,"y":240,"wires":[["c2d9cbe7.35c678"],["c2d9cbe7.35c678"],["c2d9cbe7.35c678"],["c2d9cbe7.35c678"]]},{"id":"c2d9cbe7.35c678","type":"debug","z":"4c74a996ec0dcce6","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":670,"y":160,"wires":[]}]

```

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<div class="post-metadata">

**Author:** ![Kundepuu](https://avatars.discourse-cdn.com/v4/letter/k/bcef8e/32.png) [@Kundepuu](https://discourse.nodered.org/u/Kundepuu)\
**Post date:** [26 May 2022 09:10 UTC](https://discourse.nodered.org/t/output-wrong-topic-name/63090/3 "2022-05-26T09:10:16Z")

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Thank you very much

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<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:** [9 June 2022 09:10 UTC](https://discourse.nodered.org/t/output-wrong-topic-name/63090/4 "2022-06-09T09:10:57Z")

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