json problems

#include <ArduinoJson.h>
StaticJsonBuffer<200> jsonBuffer;
/*
 *  Simple HTTP get webclient test
 */

#include <ESP8266WiFi.h>
 char json[] = {0};
 char x[] = {0};
 JsonArray& root = jsonBuffer.parseArray(json);
const char* ssid     = "lehigh-guest";
const char* password = "";
#define MAX_JSON_SIZE 256
const char* host = "api.thingspeak.com";

String field1;
String field2;
void setup() {
  Serial.begin(115200);
  delay(100);
 StaticJsonBuffer<200> jsonBuffer;
  // We start by connecting to a WiFi network
 char json[] = {0};


  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
}

int value = 0;

void loop() {
  char json[256] = {0u};
  delay(5000);


  ++value;


  // Use WiFiClient class to create TCP connections
  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(host, httpPort)) {
    return;
  }

  // We now create a URI for the request
  String url = "/channels/103752/feeds/last";


  // This will send the request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "Connection: close\r\n\r\n");
  delay(500);

  // Read all the lines of the reply from server and print them to Serial
  while(client.available()){
    String line = client.readStringUntil('\r\n\r\n');
    line.toCharArray (x,256);
    Serial.print(line);

     char json = x[256];
    JsonArray& root = jsonBuffer.parseArray(json);
    if (!root.success()){
      Serial.println("parseObject() failed");
      return;
    }
    String field1 = root["field1"];
    String field2 = root["field2"];
    Serial.println(field1);
    Serial.println(field2);

    }
  }