How do I get formatted JSON in NET using C

Question

I am using  NET JSON parser and would like to serialize my config file so it is readable  So instead of      blah   v    blah2   v2     I would like something nicer like          blah   v         blah2   v2      My code is something like this   using System Web Script Serialization    var ser   new JavaScriptSerializer    configSz   ser Serialize config   using  var f    TextWriter File CreateText configFn         f WriteLine configSz       f Close

User · Answer

Shortest version to prettify existing JSON   edit  using JSON net   JToken Parse  mystring   ToString     Input     menu      id    file    value    File    popup      menuitem       value    New    onclick    CreateNewDoc        value    Open    onclick    OpenDoc        value    Close    onclick    CloseDoc              Output        menu          id    file        value    File        popup            menuitem                          value    New              onclick    CreateNewDoc                                    value    Open              onclick    OpenDoc                                    value    Close              onclick    CloseDoc                                    To pretty-print an object    JToken FromObject myObject  ToString

User · Answer

You are going to have a hard time accomplishing this with JavaScriptSerializer    Try JSON Net   With minor modifications from JSON Net example  using System  using Newtonsoft Json   namespace JsonPrettyPrint       internal class Program               private static void Main string   args                        Product product   new Product                                       Name    Apple                       Expiry   new DateTime 2008  12  28                       Price   3 99M                      Sizes   new      Small    Medium    Large                                    string json   JsonConvert SerializeObject product  Formatting Indented               Console WriteLine json                Product deserializedProduct   JsonConvert DeserializeObject lt Product gt  json                        internal class Product               public String   Sizes   get  set            public decimal Price   get  set            public DateTime Expiry   get  set            public string Name   get  set              Results       Sizes          Small        Medium        Large          Price   3 99     Expiry      Date 1230447600000-0700         Name    Apple      Documentation  Serialize an Object

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netcoreapp3 1  var js   JsonSerializer Serialize obj  new JsonSerializerOptions                WriteIndented   true

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If you have a JSON string and want to  prettify  it  but don t want to serialise it to and from a known C  type then the following does the trick  using JSON NET    using System  using System IO  using Newtonsoft Json   class JsonUtil       public static string JsonPrettify string json                using  var stringReader   new StringReader json           using  var stringWriter   new StringWriter                          var jsonReader   new JsonTextReader stringReader               var jsonWriter   new JsonTextWriter stringWriter    Formatting   Formatting Indented                jsonWriter WriteToken jsonReader               return stringWriter ToString

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Using System Text Json set JsonSerializerOptions WriteIndented   true   JsonSerializerOptions options   new JsonSerializerOptions   WriteIndented   true    string json   JsonSerializer Serialize lt Type gt  object  options

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This worked for me  In case someone is looking for a VB NET version    imports System  imports System IO  imports Newtonsoft Json  Public Shared Function JsonPrettify ByVal json As String  As String   Using stringReader   New StringReader json       Using stringWriter   New StringWriter         Dim jsonReader   New JsonTextReader stringReader        Dim jsonWriter   New JsonTextWriter stringWriter  With              Formatting   Formatting Indented               jsonWriter WriteToken jsonReader        Return stringWriter ToString       End Using   End Using End Function

User · Answer

Below code works for me   JsonConvert SerializeObject JToken Parse yourobj ToString

User · Answer

Here is a solution using Microsoft s System Text Json library   static string FormatJsonText string jsonString        using var doc   JsonDocument Parse          jsonString          new JsonDocumentOptions                       AllowTrailingCommas   true                      MemoryStream memoryStream   new MemoryStream        using           var utf8JsonWriter   new Utf8JsonWriter              memoryStream              new JsonWriterOptions                               Indented   true                                             doc WriteTo utf8JsonWriter             return new System Text UTF8Encoding            GetString memoryStream ToArray

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All this can be done in one simple line    string jsonString   JsonConvert SerializeObject yourObject  Formatting Indented

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First I wanted to add comment under Duncan Smart post  but unfortunately I have not got enough reputation yet to leave comments  So I will try it here    I just want to warn about side effects    JsonTextReader internally parses json into typed JTokens and then serialises them back    For example if your original JSON was      double  0 00002   date     Date 1198908717056        After prettify you get          double  2E-05       date    2007-12-29T06 11 57 056Z      Of course both json string are equivalent and will deserialize to structurally equal objects  but if you need to preserve original string values  you need to take this into concideration

User · Answer

You may use following standard method for getting formatted Json  JsonReaderWriterFactory CreateJsonWriter Stream stream  Encoding encoding  bool ownsStream  bool indent  string indentChars   Only set  indent  true   Try something like this      public readonly DataContractJsonSerializerSettings Settings                new DataContractJsonSerializerSettings               UseSimpleDictionaryFormat   true         public void Keep lt TValue gt  TValue item  string path                try                       using  var stream   File Open path  FileMode Create                                   var currentCulture   Thread CurrentThread CurrentCulture                    Thread CurrentThread CurrentCulture   CultureInfo InvariantCulture                   try                                       using  var writer   JsonReaderWriterFactory CreateJsonWriter                          stream  Encoding UTF8  true  true                                                       var serializer   new DataContractJsonSerializer type  Settings                           serializer WriteObject writer  item                           writer Flush                                                            catch  Exception exception                                        Debug WriteLine exception ToString                                       finally                                         Thread CurrentThread CurrentCulture   currentCulture                                                    catch  Exception exception                        Debug WriteLine exception ToString                       Pay your attention to lines      var currentCulture   Thread CurrentThread CurrentCulture      Thread CurrentThread CurrentCulture   CultureInfo InvariantCulture               Thread CurrentThread CurrentCulture   currentCulture    For some kinds of xml-serializers you should use InvariantCulture to avoid exception during deserialization on the computers with different Regional settings  For example  invalid format of double or DateTime sometimes cause them   For deserializing      public TValue Revive lt TValue gt  string path  params object   constructorArgs                try                       using  var stream   File OpenRead path                                   var currentCulture   Thread CurrentThread CurrentCulture                    Thread CurrentThread CurrentCulture   CultureInfo InvariantCulture                   try                                       var serializer   new DataContractJsonSerializer type  Settings                       var item    TValue  serializer ReadObject stream                       if  Equals item  null   throw new Exception                        return item                                    catch  Exception exception                                        Debug WriteLine exception ToString                         return  TValue  Activator CreateInstance type  constructorArgs                                     finally                                         Thread CurrentThread CurrentCulture   currentCulture                                                    catch                       return  TValue  Activator CreateInstance typeof  TValue   constructorArgs                     Thanks

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For UTF8 encoded JSON file using  NET Core 3 1  I was finally able to use JsonDocument based upon this information from Microsoft  https   docs microsoft com en-us dotnet standard serialization system-text-json-how-to utf8jsonreader-utf8jsonwriter-and-jsondocument string allLinesAsOneString   string Empty  string    lines   File ReadAllLines filename  Encoding UTF8   foreach var line in lines      allLinesAsOneString    line   JsonDocument jd   JsonDocument Parse Encoding UTF8 GetBytes allLinesAsOneString    var writer   new Utf8JsonWriter Console OpenStandardOutput    new JsonWriterOptions       Indented   true     JsonElement root   jd RootElement  if  root ValueKind    JsonValueKind Object         writer WriteStartObject      foreach  var jp in root EnumerateObject        jp WriteTo writer   writer WriteEndObject     writer Flush

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Oneliner using Newtonsoft Json Linq   string prettyJson   JToken Parse uglyJsonString  ToString Formatting Indented

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A shorter sample code for Json Net library  private static string FormatJson string json        dynamic parsedJson   JsonConvert DeserializeObject json       return JsonConvert SerializeObject parsedJson  Formatting Indented

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