Hi.
Are you following a specific project?
Can you provide more details about what you want to do?
It seems to me that you want to parse a json object, but I’m not sure that I understood your question? https://cookbook.nodered.org/mqtt/receive-json

Regards,
Sara

Hi Sara,
thank you for your quick reply I do not follow a prebuilt project. I want to get all the data from my solar installation to a dashboard and later add some functionality to switch a battery on and off depending on the values.
At my power meter I installed a tasmota device which is sending MQTT messages to a broker on a raspberry pi.
the values coming from the tasmota- sensors-node are shown in my last post. What I need is a function to extract the numerical values after “SML: object” to 8 separate outputs to be able to prrocess them , feed them to a influxdb bucket and show them on the dashboard.
Here is a screenshot from my nodered: https://www.dropbox.com/scl/fi/obxr68amzk5t47xdlkg4q/noderedFlow-2024-01-26-18-02-55.png?rlkey=e8f9wweyrlknr2l25dob11bck&dl=0
I tried a function like this:

var msg1 = { payload: “first out of output 1” };
var msg2 = { payload: “first out of output 2” };
var msg3 = { payload: “first out of output 3” };
var msg4 = { payload: “first out of output 4” };
var msg5 = { payload: “first out of output 5” };
var msg6 = { payload: “first out of output 6” };
return msg;
 

 it returns the complete message of the tasmota-node at all the outputs, but  I just want the 8 numeric values after SML:object. The leading string (e.g. 1_8_0:)  should be omitted, I will use them only to find meaningful names for the variables like “total power” or so…
 

Hi.
I recommend taking a look at these discussions:
https://discourse.nodered.org/t/retrieving-variables-from-payload-object/13101/5
https://discourse.nodered.org/t/extract-data-from-object/89/4
 
And read this page: 
https://nodered.org/docs/user-guide/messages
 
I hope this helps.
 
Regards,
Sara

Thanks Sara,
the links above were interesting but not very close to my problem. Is there any example with a data structure very similar to the Objects I posted?  I need the numerical values contained in the string after SML as an output to my dashboard and Influx database.
A function like this

msg.payload.sn.SML[“16_7_0”]
return msg;

 
yields the complete Object –>  
 
object
sn: object
Time: “2024-01-29T19:51:09”
SML: object
1_8_0: 7926.11222099
1_8_1: 1.017
1_8_2: 7925.09522099
2_8_0: 275.67717328
16_7_0: 319
36_7_0: 184
56_7_0: 10
76_7_0: 125
96_1_0: “090145425a0100137d3b”

ver: 1

 
A function like this would give me the number but it is not allowed…
 

return msg.payload.sn.SML[“16_7_0”];

 
I get an Error: ““Function tried to send a message of type number”   
Well, that`s what I want    :-)) But it just tries…
How can I make it to really send this number? 

If I’m not mistaken, Node-RED expects messages to be JavaScript objects.
 
I think you should use something like this:
 

msg.payload = msg.sn.SML["16_7_0"]
return msg

 
To return the entire msg object.
Regards,
Sara