String cannot be converted to JSON - Android

Question

I have am trying to convert my response from a POST to JSON. And here is what I am doing:

InputStream is = connection.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
String line;
StringBuilder response = new StringBuilder();
while((line = rd.readLine()) != null) {
    response.append(line).append("\r");
}
rd.close();
Log.i(TAG, response.toString());
JSONObject jsonObject = new JSONObject(response.toString());

But then I get error java.lang.String cannot be converted to JSONObject

But if I make a string, String string; and then I paste the what I logged and set it equal to string, and then try

JSONObject jsonObject = new JSONObject(string);

It works, so why is it working when I paste the logged response, but not when I just use response.toString();?

In the logcat it looks like this {"url": "www.google.com"}. And then when I paste it into string = "{\"url\": \"www.google.com\"}";

Thanks for the help

Please post the Json response you are getting from the server. — Balvinder Singh
– Balvinder Singh, Commented Jun 30, 2015 at 6:21
Where do you get the error you describe? Is it a compile-time error? An execution-time error? Which line? Have you tried not including the \r between lines? Is it possible that there's an unprintable character somewhere in the data? — Jon Skeet
– Jon Skeet, Commented Jun 30, 2015 at 6:23
Maybe after executing of this line in the while loop response.append(line).append("\n"); you become some unexpected new lines in your response and the JSONObject doesn't know how to manage them and maybe when you paste the response from logcat, you eliminate these lines. Try to add .trim() to the response.toString() — Gabriella Angelova
– Gabriella Angelova, Commented Jun 30, 2015 at 6:23
@JonSkeet is it execution-time error on the line JSONObject jsonObject = new JSONObject(response.toString()); — james brown
– james brown, Commented Jun 30, 2015 at 6:23

rainash · Accepted Answer · 2015-06-30 06:37:16Z

2

I met this problem before, try this:

new JSONObject(json.substring(json.indexOf("{"), json.lastIndexOf("}") + 1));

or

if (response != null && response.startsWith("\ufeff")) {  
     in = in.substring(1);  
}

the response from server contains a BOM header

answered Jun 30, 2015 at 6:37

rainash

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1 Comment

james brown Over a year ago

what if it is longer than 1 character? or isnt alwasys an "a", as sometimes its longer or a different character?

Anand Singh · Accepted Answer · 2015-06-30 06:34:58Z

0

public JSONObject(java.lang.String source)
           throws JSONException

Construct a JSONObject from a source JSON text string.

source - A string beginning with { (left brace) and ending with } (right brace).

So while doing response.toString() if the string do not start with { and close with } then it will throw Exception.

answered Jun 30, 2015 at 6:34

Anand Singh

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3 Comments

james brown Over a year ago

okay but how can, I either jsut retun the JSON, or remove the begining string

Anand Singh Over a year ago

@jamesbrown you can do something like this String result = "{" + response.substring(response.indexOf("{") + 1, response.indexOf("}")) + "}"; to remove begning String.

Anand Singh Over a year ago

and then pass the result to JSONObject

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