# Modbus Flex Connector: Error Payload not Valid - connector Type

**URL:** <https://discourse.nodered.org/t/modbus-flex-connector-error-payload-not-valid-connector-type/56297>\
**Category:** General\
**Created:** [8 January 2022 12:02 UTC](https://discourse.nodered.org/t/modbus-flex-connector-error-payload-not-valid-connector-type/56297 "2022-01-08T12:02:23Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![SeRiusRod](https://avatars.discourse-cdn.com/v4/letter/s/278dde/32.png) [@SeRiusRod](https://discourse.nodered.org/u/SeRiusRod)\
**Post date:** [8 January 2022 12:02 UTC](https://discourse.nodered.org/t/modbus-flex-connector-error-payload-not-valid-connector-type/56297/1 "2022-01-08T12:02:23Z")

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![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/7/a/7a198aeba24d0c1843afc05ad21114a2eb423e71.png)

Created with change node json:  
 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/e/be46276c39e2626d50566d05423edf9fd9dbcd4c.png)

I don't understand where's the problem. It's just like the documentation example, but replacing single quotes that are not valid on json.

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**Author:** ![UnborN](https://avatars.discourse-cdn.com/v4/letter/u/4491bb/32.png) [@UnborN](https://discourse.nodered.org/u/UnborN)\
**Post date:** [8 January 2022 20:13 UTC](https://discourse.nodered.org/t/modbus-flex-connector-error-payload-not-valid-connector-type/56297/2 "2022-01-08T20:13:53Z")

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> [@SeRiusRod](#):
>
> It's just like the documentation example

Hello .. not exactly .. in the help docs of the Flex Connector node the examples are for a Function node.  
You have used a Change node, which is still fine, but you constructed a payload object inside of msg.payload (`msg.payload.payload`) as i can see from the screenshot.

**sidenote:** the single quotes would have worked if you do for example:  
`msg.payload = { 'connectorType': 'TCP', 'tcpHost': '127.0.0.1', 'unitId': 2 } return msg`  
because in Function node payload is a Javascript object and single quotes are allowed there.  
In Change node you use JSON and needs double quotes.

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<div class="post-metadata">

**Author:** ![SeRiusRod](https://avatars.discourse-cdn.com/v4/letter/s/278dde/32.png) [@SeRiusRod](https://discourse.nodered.org/u/SeRiusRod)\
**Post date:** [8 January 2022 20:44 UTC](https://discourse.nodered.org/t/modbus-flex-connector-error-payload-not-valid-connector-type/56297/3 "2022-01-08T20:44:50Z")

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DOH! Your absolutely right.... 😳 😱

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [22 January 2022 20:45 UTC](https://discourse.nodered.org/t/modbus-flex-connector-error-payload-not-valid-connector-type/56297/4 "2022-01-22T20:45:28Z")

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