Let's say the GET response is a flat string containing large .json file with all the commas and curly brackets. The idea is to read it byte-by-byte and instead of storing it just find the key you need and extract its value.

HTTPClient http;
http.begin("http://data.nba.net/data/10s/prod/v1/20190223/scoreboard.json");
int httpCode = http.GET();
if (httpCode == HTTP_CODE_OK)
  Serial.println(getValue(http, "97.5 FM", 3, 4));

where the getValue() function is defined as follows:

String getValue(HTTPClient &http, String key, int skip, int get) {
  bool found = false, look = false;
  int ind = 0;
  String ret_str = "";

  int len = http.getSize();
  char char_buff[1];
  WiFiClient * stream = http.getStreamPtr();
  while (http.connected() && (len > 0 || len == -1)) {
    size_t size = stream->available();
    if (size) {
      int c = stream->readBytes(char_buff, ((size > sizeof(char_buff)) ? sizeof(char_buff) : size));
      if (len > 0)
        len -= c;
      if (found) {
        if (skip == 0) {
          ret_str += char_buff[0];
          get --;
        } else
          skip --;
        if (get <= 0)
          break;
      }
      else if ((!look) && (char_buff[0] == key[0])) {
        look = true;
        ind = 1;
      } else if (look && (char_buff[0] == key[ind])) {
        ind ++;
        if (ind == key.length()) found = true;
      } else if (look && (char_buff[0] != key[ind])) {
        ind = 0;
        look = false;
      }
    }
  }
  return ret_str;
}

There is probably (i.e., most likely) a better way of doing this, but this approach works and it's pretty fast, so...

Let's say the GET response is a flat string containing a large .json file with all the commas and curly brackets. The idea is to read it byte-by-byte, and instead of storing it, just find the key you need and extract its value.

    HTTPClient http;
    http.begin("http://data.nba.net/data/10s/prod/v1/20190223/scoreboard.json");
    int httpCode = http.GET();
    if (httpCode == HTTP_CODE_OK)
      Serial.println(getValue(http, "97.5 FM", 3, 4));

Where the getValue() function is defined as follows:

    String getValue(HTTPClient &http, String key, int skip, int get) {
      bool found = false, look = false;
      int ind = 0;
      String ret_str = "";
    
      int len = http.getSize();
      char char_buff[1];
      WiFiClient * stream = http.getStreamPtr();
      while (http.connected() && (len > 0 || len == -1)) {
        size_t size = stream->available();
        if (size) {
          int c = stream->readBytes(char_buff, ((size > sizeof(char_buff)) ? sizeof(char_buff) : size));
          if (len > 0)
            len -= c;
          if (found) {
            if (skip == 0) {
              ret_str += char_buff[0];
              get --;
            } else
              skip --;
            if (get <= 0)
              break;
          }
          else if ((!look) && (char_buff[0] == key[0])) {
            look = true;
            ind = 1;
          } else if (look && (char_buff[0] == key[ind])) {
            ind ++;
            if (ind == key.length()) found = true;
          } else if (look && (char_buff[0] != key[ind])) {
            ind = 0;
            look = false;
          }
        }
      }
      return ret_str;
    }

There is probably (i.e., most likely) a better way of doing this, but this approach works and it's pretty fast.

Let's say the GET response is a flat string containing large .json file with all the commas and curly brackets. The idea is to read it byte-by-byte and instead fo storing it just find whatever key you need and extract its value.

Let's say the GET response is a flat string containing large .json file with all the commas and curly brackets. The idea is to read it byte-by-byte and instead of storing it just find the key you need and extract its value.