JSON (JavaScript Object Notation)

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easily read and written by humans and parsed and generated by machines. The application/json is the official Internet media type for JSON. The JSON filename extension is .json.

The System.Text.Json namespace provides high-performance, low-allocating, and standards-compliant tools to work with JSON. The classes allow us to serialize objects into JSON text and deserialize JSON text to objects. The UTF-8 support is built-in.

The JsonDocument.Parse parses a stream as UTF-8-encoded data representing a single JSON value into a JsonDocument. The stream is read to completion.

using System.Text.Json;

string data = @" [ {""name"": ""Krish Jackon"", ""phoneNumber"": ""123456""}, 
    {""name"": ""Marc Moore"", ""phoneNumber"": ""654321""} ]";

using JsonDocument doc = JsonDocument.Parse(data);
JsonElement root = doc.RootElement;

• JsonDocument.Parse Method (System.Text.Json) | Microsoft Learn
• C# JSON - working with JSON data in C# (zetcode.com)

The JsonSerializer.Serialize converts the value of a specified type into a JSON string.

using System.Text.Json;

var user = new User("Krish Jackon", "female", new MyDate(1985, 03, 30));

var json = JsonSerializer.Serialize(user);
Console.WriteLine(json);

The JsonSerializer.Deserialize parses the text representing a single JSON value into an instance of a specified type.

using System.Text.Json;

string json = @"{""Name"":""Krish Jackon"", ""Gender"":""female"",
    ""DateOfBirth"":{""year"":1985,""month"":03,""day"":30}}";

var user = JsonSerializer.Deserialize<User>(json);

Resources to deserialize to dynamic object

• How to Deserialize JSON Into Dynamic Object in C# - Code Maze (code-maze.com)
• Querying JSON with dynamic (newtonsoft.com)