JSONException Value of type java lang String cannot be converted to JSONObject

Question

I have a JSON file with 2 JSON-Arrays in it  One Array for routes and one Array for sights   A route should consist of several sights where the user gets navigated to  Unfortunately I am getting the error   JSONException  Value  of type java lang String cannot be converted to JSONObject  Here are my variables and the code that parses the JSON-File   private InputStream is   null  private String json       private JSONObject jObj   null   try       BufferedReader reader   new BufferedReader new InputStreamReader is   iso-8859-1    8       StringBuilder sb   new StringBuilder        String line   null      while   line   reader readLine       null            sb append line     n              is close           hier habe ich das JSON-File als String     json   sb toString        Log i  JSON Parser   json     catch  Exception e        Log e  Buffer Error    Error converting result     e toString           try parse the string to a JSON object try       jObj   new JSONObject json     catch  JSONException e        Log e  JSON Parser    Error parsing data     e toString           return JSON String return jObj      Log i  JSON Parser   json   shows me that at the beginning of the generated string there is a strange sign    but the error happens here   try       jObj   new JSONObject json     catch  JSONException e        Log e  JSON Parser    Error parsing data     e toString            04-22 14 01 05 043  E JSON Parser 5868   Error parsing data   org json JSONException  Value   STRANGE SIGN HERE     of type   java lang String cannot be converted to JSONObject   anybody has a clue on how to get rid of these signs in order to create the JSONObject

User · Answer

The 3 characters at the beginning of your json string correspond to Byte Order Mask (BOM), which is a sequence of Bytes to identify the file as UTF8 file.

Be sure that the file which sends the json is encoded with utf8 (no bom) encoding.

(I had the same issue, with TextWrangler editor. Use save as - utf8 (no bom) to force the right encoding.)

Hope it helps.

User · Answer

In my case the problem occured from php file  It gave unwanted characters That is why a json parsing problem occured   Then I paste my php code in Notepad   and select Encode in utf-8 without BOM from Encoding tab and running this code-  My problem gone away

User · Answer

In my case  my Android app uses Volley to make a POST call with an empty body to an API application hosted on Microsoft Azure   The error was   JSONException  Value  lt p gt iisnode of type java lang String cannot be converted to JSONObject   This is a snippet on how I was constructing the Volley JSON request   final JSONObject emptyJsonObject   new JSONObject    JsonObjectRequest request   new JsonObjectRequest Request Method POST  url  emptyJsonObject  listener  errorListener     I solved my problem by creating the JSONObject with an empty JSON object as follows   final JSONObject emptyJsonObject   new JSONObject          My solution is along the lines to this older answer

User · Answer

Reason is some un-wanted characters was added when you compose the String  The temp solution is   return new JSONObject json substring json indexOf       json lastIndexOf        1      But try to remove hidden characters on source String

User · Answer

Here is UTF-8 version  with several exception handling   static InputStream is   null  static JSONObject jObj   null  static String json   null  static HttpResponse httpResponse   null   public JSONObject getJSONFromUrl String url           Making HTTP request     try           HttpParams params   new BasicHttpParams            HttpConnectionParams setConnectionTimeout params  10000           HttpConnectionParams setSoTimeout params  10000           HttpProtocolParams setVersion params  HttpVersion HTTP 1 1           HttpProtocolParams setContentCharset params  HTTP UTF 8           HttpProtocolParams setUseExpectContinue params  true              defaultHttpClient         DefaultHttpClient httpClient   new DefaultHttpClient params           HttpGet httpPost   new HttpGet  url           httpResponse   httpClient execute  httpPost           HttpEntity httpEntity   httpResponse getEntity            is   httpEntity getContent                     catch  UnsupportedEncodingException ee            Log i  UnsupportedEncodingException      is toString           catch  ClientProtocolException e            Log i  ClientProtocolException      is toString           catch  IOException e            Log i  IOException      is toString                try           BufferedReader reader   new BufferedReader new InputStreamReader                  is   utf-8    8     old charset iso-8859-1         StringBuilder sb   new StringBuilder            String line   null          while   line   reader readLine       null                sb append line     n                      is close            reader close            json   sb toString            Log i  StringBuilder      json         catch  Exception e            Log e  Buffer Error    Error converting result     e toString                  try parse the string to a JSON object     try           jObj   new JSONObject json         catch  Exception e            Log e  JSON Parser    Error parsing data     e toString             try               jObj   new JSONObject json substring json indexOf       json lastIndexOf        1              catch  Exception e0                Log e  JSON Parser0    Error parsing data      e0 getMessage        json               Log e  JSON Parser0    Error parsing data     e0 toString                 try                   jObj   new JSONObject json substring 1                  catch  Exception e1                    Log e  JSON Parser1    Error parsing data      e1 getMessage        json                   Log e  JSON Parser1    Error parsing data     e1 toString                     try                       jObj   new JSONObject json substring 2                      catch  Exception e2                        Log e  JSON Parser2    Error parsing data      e2 getMessage        json                       Log e  JSON Parser2    Error parsing data     e2 toString                         try                           jObj   new JSONObject json substring 3                          catch  Exception e3                            Log e  JSON Parser3    Error parsing data      e3 getMessage        json                           Log e  JSON Parser3    Error parsing data     e3 toString                                                                                   return JSON String     return jObj

User · Answer

This worked for me  json   json replace              JSONObject jo   new JSONObject json substring 1 json length  -1

User · Answer

I think the problem may be in the charset that you are trying to use   It is probably best to use UTF-8 instead of iso-8859-1   Also open whatever file is being used for your InputStream and make sure no special characters were accidentally inserted   Sometimes you have to specifically tell your editor to display hidden   special characters

User · Answer

For me  I just needed to use getString   vs  getJSONObject    the latter threw that error   JSONObject jsonObject   new JSONObject jsonString   String valueIWanted   jsonObject getString  quot access token quot

User · Answer

This is simple way  thanks Gson   JsonParser parser   new JsonParser    String retVal   parser parse param  getAsString      https   gist github com MustafaFerhan 25906d2be6ca109f61ce file-evaluatejavascript-string-problem

User · Answer

return response    After that get the response we need to parse this By   JSONObject myObj new JSONObject response     On response there is no need for double quotes

User · Answer

see this http   stleary github io JSON-java org json JSONObject html JSONObject-java lang String-  JSONObject  public JSONObject java lang String source             throws JSONException   Construct a JSONObject from a source JSON text string  This is the most commonly used  JSONObject constructor   Parameters      source -  A string beginning with    left brace  and ending with    right brace     Throws      JSONException - If there is a syntax error in the source string or a duplicated key    you try to use some thing like   new JSONObject   your string

User · Answer

Had the same problem for few days  Found a solution at last  The PHP server returned some unseen characters which you could not see in the LOG or in System out   So the solution was that i tried to substring my json String one by one and when i came to substring 3  the error went away   BTW  i used UTF-8 encoding on both sides   PHP side  header  Content-type application json  charset utf-8     JAVA side  BufferedReader reader   new BufferedReader new InputStreamReader is   utf-8    8    So try the solution one by one 1 2 3 4     Hope it helps you guys   try               jObj   new JSONObject json substring 3              catch  JSONException e                Log e  JSON Parser    Error parsing data      e getMessage        json

User · Answer

I made this change and now it works for me     BufferedReader reader   new BufferedReader new InputStreamReader is   iso-8859-1    8   BufferedReader reader   new BufferedReader new InputStreamReader is  HTTP UTF 8   8

User · Answer

if value of the Key is coming as String and you want to convert it to JSONObject   First take your key value into a String variable like   String data   yourResponse yourKey    then convert into JSONArray  JSONObject myObj new JSONObject data

[android] JSONException: Value of type java.lang.String cannot be converted to JSONObject

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