Unexpected character encountered while parsing value

Question

Currently  I have some issues  I m using C  with Json NET  The issue is that I always get     quot Unexpected character encountered while parsing value  e  Path     line 0  position 0  quot    So the way I m using Json NET is the following  I have a Class which should be saved  The class looks like this  public class stats       public string time   get  set        public string value   get  set       public class ViewerStatsFormat       public List lt stats gt  viewerstats   get  set        public String version   get  set         public ViewerStatsFormat bool chk                this viewerstats   new List lt stats gt              One object of this class will be filled and saved with   File WriteAllText tmpfile  JsonConvert SerializeObject current   Encoding UTF8    The saving part works fine and the file exists and is filled  After that the file will be read back into the class with  try         ViewerStatsFormat current   JsonConvert DeserializeObject lt ViewerStatsFormat gt  tmpfile         otherstuff           catch Exception ex          error loging stuff    Now on the current  line comes the exception     quot Unexpected character encountered while parsing value  e  Path     line 0  position 0  quot    I don t know why this comes  The JSON file is the following - gt  Click me I am the JSON link Does anyone have any ideas

User · Answer

I have also encountered this error for a Web API (.Net Core 3.0) action that was binding to a string instead to an object or a JObject. The JSON was correct, but the binder tried to get a string from the JSON structure and failed.

So, instead of:

[HttpPost("[action]")]
public object Search([FromBody] string data)

I had to use the more specific:

[HttpPost("[action]")]
public object Search([FromBody] JObject data)

User · Answer

When I encountered a similar problem  I fixed it by substituting  amp mode xml for  amp mode json in the request

User · Answer

This issue is related to Byte Order Mark in the JSON file  JSON file is not encoded as UTF8 encoding data when saved  Using File ReadAllText pathFile  fix this issue    When we are operating on Byte data and converting that to string and then passing to JsonConvert DeserializeObject  we can use UTF32 encoding to get the string   byte   docBytes   File ReadAllBytes filePath    string jsonString   Encoding UTF32 GetString docBytes

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If you are using downloading data using url   may need to use var result   client DownloadData url

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In my scenario I had a slightly different message  where the line and position were not zero      E  Path  job 0  name   line 1  position 12    This was the top Google answer for the message I quoted   This came about because I had called a program from the Windows command line  passing JSON as a parameter   When I reviewed the args in my program  all the double quotes got stripped  You have to reconstitute them   I posted a solution here  Though it could probably be enhanced with a Regex

User · Answer

Please check the model you shared between client and server is same  sometimes you get this error when you not updated the Api version and it returns a updated model  but you still have an old one  Sometimes you get what you serialize deserialize is not a valid JSON

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In my case  the file containing JSON string had BOM  Once I removed BOM the problem was solved

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In my case  I was getting an error on JsonConvert PopulateObject    My request was returning JSON that was wrapped in an extra pair of       brackets  making my result an array of one object rather than just an object   Here s what I did to get inside these brackets  only for that type of model               T jsonResponse   new T                    var settings   new JsonSerializerSettings                                       DateParseHandling   DateParseHandling DateTimeOffset                      NullValueHandling   NullValueHandling Ignore                                     var jRslt   response Content ReadAsStringAsync   Result                  if  jsonResponse GetType      typeof myProject Models myModel                                         var dobj   JsonConvert DeserializeObject lt myModel   gt  jRslt                       var y   dobj First                        var szObj   JsonConvert SerializeObject y                       JsonConvert PopulateObject szObj  jsonResponse  settings                                     else                                       JsonConvert PopulateObject jRslt  jsonResponse

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This error occurs when we parse json content to model object  Json content  type is string  For example  https   dotnetfiddle net uFClKj Some times  an api that we call may return an error  If we do not check the response status  but proceed to parse the response to model  this issue will occur

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Suppose this is your json        date   11 05 2016      venue       ID   12   CITY   Delhi       if you again want deserialize venue  modify json as below       date   11 05 2016      venue       ID     12     CITY     Delhi         then try to deserialize to respective class by taking the value of venue

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I experienced the same error in my Xamarin Android solution   I verified that my JSON was correct  and noticed that the error only appeared when I ran the app as a Release build   It turned out that the Linker was removing a library from Newtonsoft JSON  causing the JSON to be parsed incorrectly   I fixed the error by adding Newtonsoft Json to the Ignore assemblies setting in the Android Build Configuration  screen shot below   JSON Parsing Code  static readonly JsonSerializer  serializer   new JsonSerializer    static readonly HttpClient  client   new HttpClient     static async Task lt T gt  GetDataObjectFromAPI lt T gt  string apiUrl        using  var stream   await  client GetStreamAsync apiUrl  ConfigureAwait false       using  var reader   new StreamReader stream       using  var json   new JsonTextReader reader                 if  json    null              return default T            return  serializer Deserialize lt T gt  json             Visual Studio Mac Screenshot    Visual Studio Screenshot

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I solved the problem with these online tools    To check if the Json structure is OKAY  http   jsonlint com   To generate my Object class from my Json structure  https   www jsonutils com     The simple code   RootObject rootObj  JsonConvert DeserializeObject lt RootObject gt  File ReadAllText pathFile

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I had a similar error and thought I d answer in case anyone was having something similar  I was looping over a directory of json files and deserializing them but was getting this same error    The problem was that it was trying to grab hidden files as well  Make sure the file you re passing in is a  json file  I m guessing it ll handle text as well  Hope this helps

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I had the same problem with webapi in ASP NET core  in my case it was because my application needs authentication  then it assigns the annotation  AllowAnonymous  and it worked    AllowAnonymous  public async Task  lt IList  lt IServic  gt  gt  GetServices

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Possibly you are not passing JSON to DeserializeObject   It looks like from File WriteAllText tmpfile     that type of tmpfile is string that contain path to a file  JsonConvert DeserializeObject takes JSON value  not file path - so it fails trying to convert something like   c  temp fooo  - which is clearly not JSON

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I faced similar error message in Xamarin forms when sending request to webApi to get a Token     Make sure all keys  key   value   ex  username    password    grant type   in the Json file are exactly what the webApi expecting  otherwise it fires this exception       Unhandled Exception   Newtonsoft Json JsonReaderException  Unexpected character encountered while parsing value   lt   Path     line 0  position 0

[c#] Unexpected character encountered while parsing value

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