Reading local json from asset folder in android

loadJSONFromAsset.txt

public String loadJSONFromAsset() {

    String json = null;
    
      try {

        InputStream is = getAssets().open("file_name.json");
        int size = is.available();
        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();

        json = new String(buffer, "UTF-8");

      } catch (IOException ex) {
          ex.printStackTrace();
          return null;
      }
      
    return json;
}