Help with fetching JSON and parsing with jRead

[thesassyindian]

Hello all,
I am currently using ArduinoJSON to fetch a json file from a URL, parse it and display parsed values on the serial monitor - on an ESP32.
The problem I am facing with this is that the code locks up after running flawlessly for a few hours.
From reading a few posts on here, it seems it is expected behavior since it is very resource intensive.

Can somebody please help me with a code snippet in which I can use the jRead library by @TonyWilk ?
This link can be used to test fetching a JSON file from a URL: http://date.jsontest.com/

I know @WPD64 has done something like this before.

In the current setup, I am using:

      DynamicJsonDocument jsonBuffer(30000); //11000
      DeserializationError error = deserializeJson(jsonBuffer, client);

Where the data is collected from client.

Any help is greatly appreciated.
Thank you!

[Riva]

Is the example JSON date you supplied what your reading and extracting? The jsonBuffer size seems excessive for such a simple value.

{
   "date": "02-23-2022",
   "milliseconds_since_epoch": 1645596593195,
   "time": "06:09:53 AM"
}

If it is a true example then the data is very simple and should really not cause lock-up issues on an ESP32.
I read data like the below JSON on an ESP32 over LoRa, deserialize it, add extra fields like RSSI etc, serialize it and send over MQTT as a JSON string. Up until a couple of days ago where a power cut during a storm reset the ESP32 it had been running for about 8 months without issue

Receive:
{"D":"L2","N":0,"T":26.13,"P":1020.00,"A":-56.06,"H":46.82,"L":496.00,"V":3.73}

Send:
{"D":"L4","N":211,"T":20.44,"P":1018.92,"A":-47.10,"H":49.52,"L":6.70,"V":3.85,"RSSI":-47,"SNR":10,"F_ERR":14722,"TIME":1645598130}

[thesassyindian]

Hi @Riva ,
No, I posted that json link just as an example.
The file I’m trying to read is very long!

Here’s that exact file:
https://www.purpleair.com/json?show=113190