ios - Error Domain=NSCocoaErrorDomain Code=3840 "Invalid value around character 0." UserInfo={NSDebugDescription=Invalid value around character 0.} -

i trying upload image converting image base64 format. , getting below error.

error domain=nscocoaerrordomain code=3840 "invalid value around character 0." userinfo={nsdebugdescription=invalid value around character 0.}

please refer code

nsdata *imagedata = uiimagepngrepresentation(image); nsstring *imagedatastring = [imagedata base64encodedstring]; 

here post request method

- (id) postrequest:(nsurl *)posturl poststring:(nsstring *)poststring  {     nserror * error=nil;     nsurlresponse * urlresponse;     nsdata *myrequestdata = [ nsdata datawithbytes: [ poststring utf8string ] length: [ poststring length ]];     nsmutableurlrequest * request =[[nsmutableurlrequest alloc]initwithurl:posturl cachepolicy:nsurlrequestreloadignoringcachedata timeoutinterval:10];     [request sethttpbody: myrequestdata];     [request sethttpmethod:@"post"];     [request setvalue:@"application/json; charset=utf-8" forhttpheaderfield:@"content-type"];      nsdata * data =[nsurlconnection sendsynchronousrequest:request returningresponse:&urlresponse error:&error];     if (!data)     {         return nil;     }      id jsonnresponse =[nsjsonserialization jsonobjectwithdata:data options:nsjsonreadingallowfragments error:&error];     return jsonnresponse; } 

error 3840 ... invalid value around character 0.

simply means (json) string empty, got nothing server.

to nsdata string there more convenient api:

nsdata *myrequestdata = [poststring datausingencoding:nsutf8stringencoding]; 

actually base64 formatted string not json specified in header. might cause problem.

ps: don't use synchronous – deprecated – api load data on network