Hello, I am working on finding a way to do something in an easy way and also run in less amount of time. I have a function that return a msg.payload in JSON format. It sends totally different messages but they are unique and only repeats if there is new value coming for example {Voltage: 23, Cur…

If your data has a different topic for each type (or you can add a topic) then you can store the whole payload in flow or global context using a function node e.g.. var sensors = flow.get("sensors") || {}; //get the sensors state from flow context var sensorName = msg.topic; //get …

Hi @mafify Welcome. You can use the change node to save each value in a different flow variable. for example!!

For basic example: [image] mafify: {Voltage: 23, Current:2} [Captura de pantalla 2021-07-19 a la(s) 1.25.26 p. m.] [Captura de pantalla 2021-07-19 a la(s) 1.23.30 p. m.] [Captura de pantalla 2021-07-19 a la(s) 1.26.07 p. m.] and you could see in the context: [Captura de pantalla 2021-07-…

That what I did in a function node, but when the second JSON message arrive and it have different topics as ID and MID. The output of change node will output undefined.

Who is that a reply to? Did you try the function I posted? Does your data have different topic for different payloads?

that's how I tried the function, thank you :sweat_smile: var sensors = flow.get ("Sensors") || {}; var ID = msg.payload.ID; sensors[ID] = msg.payload; flow.set("sensors",sensors); return msg;

Do your messages have individual topics like I asked?

No, messages are only one part, there is no different topics [image]

A function node containing this will merge all previous values with the current values in the payload, if that is what you are looking for let values = flow.get("values") || {} Object.assign( values, msg.payload) flow.set("values", values) msg.payload = values return msg; Example flow: [{"id":"fc…

That is what I am looking for, Thank you do much!!

Saving variables from a JSON object

General

mafify 19 July 2021 19:04 7

Hello, yes I just tried it. after the JSON sent first object which is {ID:208}, the function saved it, when second message is sent from JSON which is {L:60}, the function returned it undefined

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Saving variables from a JSON object

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