"Function tried to send a message of type string"

[Ahmed Garssallaoui]

hi guys, 

I am trying to extract the 'body' part of my received mqtt message as a JSON format, the body is in base64.

First I tried to retrieve only the body part so I wrote this function:

return msg.payload.body;

but I got this error:

"Function tried to send a message of type string"

any one can help me to solve this ?? 

[Colin Law]

You must always return a message, you are returning a string. If you want the body in msg.payload then you can do

msg.payload = msg.payload.body;

return msg;

Though if that is all you are trying to do then you can use a Change node set to Move msg.payload.body Into msg.payload

Colin

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[Mark Setrem]

The docs have a good page on working with messages, it is well worth a read.

https://nodered.org/docs/user-guide/messages

[Nick O'Leary]

Note I've also responded to the same question on StackOverflow.

On 25 April 2018 at 16:11, Mark Setrem <mse...@gmail.com> wrote:

The docs have a good page on working with messages, it is well worth a read.

https://nodered.org/docs/user-guide/messages

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[Mark Setrem]

Why do people do that? It's very annoying.

[Ahmed Garssallaoui]

Thank you very much for your help.

On Wednesday, April 25, 2018 at 4:12:16 PM UTC+1, Nick O'Leary wrote:

Note I've also responded to the same question on StackOverflow.

On 25 April 2018 at 16:11, Mark Setrem <mse...@gmail.com> wrote:

The docs have a good page on working with messages, it is well worth a read.

https://nodered.org/docs/user-guide/messages

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[Ahmed Garssallaoui]

Thank you very much, that solved my problem

On Wednesday, April 25, 2018 at 3:48:46 PM UTC+1, Colin Law wrote:

You must always return a message, you are returning a string. If you want the body in msg.payload then you can do

msg.payload = msg.payload.body;

return msg;

Though if that is all you are trying to do then you can use a Change node set to Move msg.payload.body Into msg.payload

Colin

On 25 April 2018 at 14:17, Ahmed Garssallaoui <garssalla...@gmail.com> wrote:

hi guys, 

I am trying to extract the 'body' part of my received mqtt message as a JSON format, the body is in base64.

First I tried to retrieve only the body part so I wrote this function:

return msg.payload.body;

but I got this error:

"Function tried to send a message of type string"

any one can help me to solve this ?? 

--
http://nodered.org
 
Join us on Slack to continue the conversation: http://nodered.org/slack
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[Ahmed Garssallaoui]

Dear Mark, 
When I asked this question, there weren't any answer to that question by that time.
It was answered on stackoverflow after the question was posted here.

Regards

[Ahmed Garssallaoui]

Thank you