Find differences between two json objects

Question

Are there any libraries in .Net to help compare and find differences between two json objects? I've found some solutions available for JavaScript, but nothing interesting for C#. The point of my question is to create json with changes marked in some way, based on the comparison. So that the user could see where the changes are.

Answer 1

using Microsoft.XmlDiffPatch; using Newtonsoft.Json; 

Convert each json to xml and use MS XmlDiff libary. Available on nuget. Differences are given in another xml doc which here I write to the console. This is suitable for unit testing for example.

public bool CompareJson(string expected, string actual) {     var expectedDoc = JsonConvert.DeserializeXmlNode(expected, "root");     var actualDoc = JsonConvert.DeserializeXmlNode(actual, "root");     var diff = new XmlDiff(XmlDiffOptions.IgnoreWhitespace |                            XmlDiffOptions.IgnoreChildOrder);     using (var ms = new MemoryStream())     using (var writer = new XmlTextWriter(ms, Encoding.UTF8))     {         var result = diff.Compare(expectedDoc, actualDoc, writer);         if (!result)         {             ms.Seek(0, SeekOrigin.Begin);             Console.WriteLine(new StreamReader(ms).ReadToEnd());         }         return result;     } } 

Answer 2

I have used different JSON objects than those in your example but it will apply to your case correctly.

private static string GetJsonDiff(string action, string existing, string modified, string objectType)     {         // convert JSON to object         JObject xptJson = JObject.Parse(modified);         JObject actualJson = JObject.Parse(existing);          // read properties         var xptProps = xptJson.Properties().ToList();         var actProps = actualJson.Properties().ToList();          // find differing properties         var auditLog = (from existingProp in actProps             from modifiedProp in xptProps             where modifiedProp.Path.Equals(existingProp.Path)             where !modifiedProp.Value.ToString().Equals(existingProp.Value.ToString())             select new AuditLog             {                 Field = existingProp.Path,                 OldValue = existingProp.Value.ToString(),                 NewValue = modifiedProp.Value.ToString(),                 Action = action, ActionBy = GetUserName(),                 ActionDate = DateTime.UtcNow.ToLongDateString(),                 ObjectType = objectType             }).ToList();          return JsonConvert.SerializeObject(auditLog);     }