Java value of type java.lang.string cannot be converted to jsonobject

Question

I have an API (here) that outputs a JSON string as output. I want to parse this JSON. It was working a while ago, but I might have changed something in my API or java code.

This is the code I'm using:

Here, msg is a string which contains the api response

try {
    /* this prints */
    Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
    JSONObject jObject = new JSONObject(msg);
    String cleaner_id = jObject.getString("cleaner_id");

   /* but this does not */
   Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();

}
catch(Exception e) {
   Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_SHORT).show();
}

I'm using codeigniter framework in php.

This is the function in my php model :

public function get_cleaner($mobile, $pass){
    $this->db->select("cleaner.cleaner_id, cleaner.cleaner_name, cleaner.date_of_joining, cleaner.current_address, cleaner.mobile1, cleaner.mobile2, cleaner.date_of_birth, skill.skill_name as cleaner_designation");
    $this->db->from("cleaner");
    $this->db->join('skill', 'cleaner.designation = skill.skill_id', 'left');
    $this->db->where("mobile1", $mobile);
    $this->db->where("user_pass", $pass);
    $data = $this->db->get()->result_array();

    return $data;
}

And this is my php controller :

public function getCleaner(){
    $mobile_no = $this->input->get('mobile');
    $pass = $this->input->get('pass');
    if(!is_null($mobile_no) && !is_null($pass))
    {
        header('Content-Type: application/javascript');
        $data = $this->cleaner_model->get_cleaner($mobile_no, $pass);
        if(!empty($data))
            echo json_encode($data[0]);
        else 
            echo '{"cleaner_id":"-10","cleaner_name":"cleaner_not_found"}';
    }

}

I have searched a lot and tried a lot of different solutions I found n web, but none of the solutions I have tried has worked out for me.

UPDATE :

this gives the error

But

this parses fine and gives me just key not found exception

Github sample json api and my api give the cannot convert string to json obj exception, but google maps api doesn't. Is there anything wrong with my api format ??

FIXED : I finally figured out that my api output had a leading hidden character which caused the parsing error

This is a screenshot of the error I receive (Too big a screenshot, but you get the idea...)

Do you use org.json.JSONObject class or org.json.simple.JSONObject. ? — Akram Qalalwa, Sep 26 '16 at 12:03
Why is your content type `application/javascript` instead of `application/json`? — RealSkeptic, Sep 26 '16 at 12:04
I'tried using application/json but it didn't change anything — mrid, Sep 26 '16 at 12:07
You may try to use a different library, for example http://java2s.com/Code/Jar/j/Downloadjsonlibjar.htm — Akram Qalalwa, Sep 27 '16 at 08:09

score 0 · Answer 1 · answered Sep 27 '16 at 08:30

I tried to solve the issue, nothing worked for me and I don't know why! I have a solution but I don't know if it does make sense!

    try{
        HttpURLConnection conn = (HttpURLConnection) new URL("http://mridulahuja.com/api/index.php/cleaner/getCleaner?mobile=1111111111&pass=njnjhbh").openConnection();
        InputStreamReader isr = new InputStreamReader(conn.getInputStream(), "UTF-8");
        BufferedReader reader = new BufferedReader(isr);
        String line = reader.readLine();
        if(line != null){
            line = line.substring(line.indexOf("{"));
            JSONObject obj = new JSONObject(line);
            System.out.println(obj.getString("cleaner_name"));
        }
        reader.close();
    }catch(Exception e){
        System.err.println(e.getMessage());
    }

Java value of type java.lang.string cannot be converted to jsonobject

1 Answers1