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I would recommend a JSON parsing library. Checkout https://github.com/bblanchon/ArduinoJson

var response = [] ; // get response here
int response_length = 4; //Put response length here
StaticJsonBuffer<200> jsonBuffer;
String action_ids[] = new String[response_length];
String action_types[] = new String[response_length];
String action_statuses[] = new String[response_length];
String ramp_ids[] = new String[response_length];
String user_ids[] = new String[response_length];
for (int i=0; i < response_length ; i++) {
 JsonObject& data = jsonBuffer.parseObject(response[i]);
 
 action_ids[i] = data["action_id"];
 action_types[i] = data["action_type"];
 action_statuses[i] = data["action_status"];
 ramp_ids[i] = data["ramp_id"];
 user_ids[i] = data["user_id"];
}

I would recommend a JSON parsing library. Checkout https://github.com/bblanchon/ArduinoJson

var response = [] ; // get response here
int response_length = 4; //Put length of the response array here
StaticJsonBuffer<200> jsonBuffer;
String action_ids[] = new String[response_length];
String action_types[] = new String[response_length];
String action_statuses[] = new String[response_length];
String ramp_ids[] = new String[response_length];
String user_ids[] = new String[response_length];
for (int i=0; i < response_length ; i++) {
 JsonObject& data = jsonBuffer.parseObject(response[i]);
 // Note the '&' above
 
 action_ids[i] = data["action_id"];
 action_types[i] = data["action_type"];
 action_statuses[i] = data["action_status"];
 ramp_ids[i] = data["ramp_id"];
 user_ids[i] = data["user_id"];
}

Of course, you only need to extract those fields that you need.

You should use a JSON parser library. Checkout https://github.com/bblanchon/ArduinoJson

char json[] = "{"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}";

StaticJsonBuffer<200> jsonBuffer;

JsonObject& root = jsonBuffer.parseObject(json);

const char* sensor = root["sensor"]; long time = root["time"]; double latitude = root["data"][0]; double longitude = root["data"][1];

I would recommend a JSON parsing library. Checkout https://github.com/bblanchon/ArduinoJson

var response = [] ; // get response here
int response_length = 4; //Put response length here
StaticJsonBuffer<200> jsonBuffer;
String action_ids[] = new String[response_length];
String action_types[] = new String[response_length];
String action_statuses[] = new String[response_length];
String ramp_ids[] = new String[response_length];
String user_ids[] = new String[response_length];
for (int i=0; i < response_length ; i++) {
 JsonObject& data = jsonBuffer.parseObject(response[i]);
 
 action_ids[i] = data["action_id"];
 action_types[i] = data["action_type"];
 action_statuses[i] = data["action_status"];
 ramp_ids[i] = data["ramp_id"];
 user_ids[i] = data["user_id"];
}

I use Ethernet Shield and Arduino to GET data from the server in JSON format.

var response = [] ; // get response here
int response_length = 4; //Put response length here
StaticJsonBuffer<200> jsonBuffer;
String action_ids[] = new String[response_length];
String action_types[] = new String[response_length];
String action_statuses[] = new String[response_length];
String ramp_ids[] = new String[response_length];
String user_ids[] = new String[response_length];
for (int i=0; i < response_length ; i++) {
 JsonObject& data = jsonBuffer.parseObject(response[i]);
 
 action_ids[i] = data["action_id"];
 action_types[i] = data["action_type"];
 action_statuses[i] = data["action_status"];
 ramp_ids[i] = data["ramp_id"];
 user_ids[i] = data["user_id"];
}

You should use a JSON parser library. Checkout https://github.com/bblanchon/ArduinoJson

char json[] = "{"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}";

StaticJsonBuffer<200> jsonBuffer;

JsonObject& root = jsonBuffer.parseObject(json);

const char* sensor = root["sensor"]; long time = root["time"]; double latitude = root["data"][0]; double longitude = root["data"][1];