I have created an API in Ruby on Rails and it send the following JSON response:


I'm able to successfully hit the API and store the response. But when I try to parse it and store data it gives me an error. I have used the Arduino JSON library.

The code for parsing the JSON is as follows:

bool parseSunPosData(char* content, SunPosData* sunPos) {
  StaticJsonBuffer<JSONBUFFER_SIZE> jsonBuffer;
  JsonObject& root = jsonBuffer.parseObject(content);
  Serial.println("In parse fuc");
  if (!root.success()) {
    Serial.println("JSON parsing failed!");
    return false;

And the output on the serial monitor is as follows:

In parse fuc 38

{"sun_position":{"altitude":"32.46","azimuth":"223.93"}} 0


JSON parsing failed! Disconnect

My guess is it can't parse the data due to the numbers 38 and zero printing... I don't know what that is and what it is.

PS: New to Arduino coding.

1 Answer 1


you have the HTTP chunked transfer encoding numbers in the content. 38 is the length of the body and it is on the first line of the HTTP body and 0 marks the end. maybe try using ArduinoHttpClient library for HTTP

  • Thanks Juraj, That helped.. I changed the HTTP version to 1.0 from 1.1 and it worked like a charm Dec 19, 2017 at 10:43

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