Custom Serialize json document

Projects Programming
1

I'd like to know if is there a way to serialize a Json doc selecting the key-value pairs instead of serializing all the document, using arduino json library.

thanks

3

look at filters

āžœ ArduinoJson 6.15: Filtering done right | ArduinoJson

4

that's what I need, but filters only available on deserialize.

5

sorry I misread

so you want to built a JSON just using some key/values out of another JSON?

6

yes, I need to take the valid key/value pairs of a JSON and serialize it to send it by serial comunication.

7

Isn't that the same as building a JSON document from any other source data and then serializing it? Can you give an example of the resulting JSON? Or the source JSON and which pairs are 'valid'?

8

since the JSON doc will be changing on amount of members, could I build a JSON with the valid data and after use it, destroy the JSON doc for the next time create a new one, is that possible?

the JSON will be something like this ```
{"temperature":21.2,"humidity":68.9,"pressure":1003}

9

For something like that, you barely need to use a JSON object. You can just print the text and variables directly to the serial port.

10

The ArduinoJson.org 'Assistant' says you would create your JSON document this way:

StaticJsonDocument<48> doc;

doc["temperature"] = 21.2;
doc["humidity"] = 68.9;
doc["pressure"] = 1003;

serializeJson(doc, output);

You can then use doc.clear(); to empty the document and reset the memory pool. (StaticJsonDocument | ArduinoJson 6)

11

Thanks, I will try that way.

12

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