In this article, we are going to discuss about EF Core 7 feature that JSON data mapping, querying and updating operation. JSON Document Case Study: Here we can observe a 'Employee' table whose contact details are saved as document data. In general, we have to read it as string data in our dotnet application. But EF Core 7 supports that we can map the JSON document as a normal C# class and also we query them and also we can update the data inside of the document either fully or partially. Fetch JSON As Simple String: First, let's check the simple API endpoint which will fetch data directly which means our 'ContactDetails' column in the database is a simple string. Our table class is like 'Employee.cs'. Employee.cs: public class Employee { public int Id { get; set; } public string? FullName { get; set; } public string? ContactDetails { get; set; } } Our database context is like 'MyWorldDbContext.cs'. MyWorldDbContext.cs: using Dot7.JsonM