Json group array with a node value

On your example you have different property names("Time", "eventTime") - I assumed that "Time" is a correct one.

Below you can see how grouping was done:

JObject obj = JObject.Parse(jsonasstring); JObject objRoot = (JObject)obj.SelectToken("root"); var studentsList = from students in objRoot["students"] group students by students["student"]["Id"] into studentsgroup select new { StudentId = studentsgroup.Key, Students = studentsgroup.Select(x => new {StudentName = x["student"]["Name"], Type = x["Type"], Time = x["Time"]})}; 

You get students list, group it by studentId and do selection as you need.

Result:

Select all objects in the students JSON array, then use Linq's GroupBy to bucket them by the student.Id property.

var studentsGroupedById = JObject.Parse(jsonasstring) .SelectTokens("$.root.students[*]") .GroupBy(x => x["student"]["Id"]); 

In each group, Key is the student.Id property, and you can enumerate through all the entries in the group (the inner foreach loop).

Runnable online version that prints out results to demonstrate the groups

I corrected what I hope is a typo in your JSON - the first student entry has a Time property, not an eventTime property. If that's actually how the data is formatted you'll need to account for it.