How to Write a JSON File in C# Using Newtonsoft.Json and System.Text.Json?

How to write a JSON file in C#?

To write your data into a text file in JSON format, you can use a library such as Newtonsoft Json.Net or System.Text.Json (for .NET Core 3.0 and .NET 5 ). Let's explore both options:

Newtonsoft Json.Net (.Net Framework and .Net Core)

// Initialize your data
List<data> _data = new List<data>();
_data.Add(new data()
{
    Id = 1,
    SSN = 2,
    Message = "A Message"
});

// Serialize the data to JSON
string json = JsonConvert.SerializeObject(_data.ToArray());

// Write the JSON string to a file
System.IO.File.WriteAllText(@"D:\path.txt", json);

System.Text.Json (.NET Core 3.0 and .NET 5 )

// Initialize your data
List<data> _data = new List<data>();
_data.Add(new data()
{
    Id = 1,
    SSN = 2,
    Message = "A Message"
});

// Serialize the data to JSON (synchronously)
string json = JsonSerializer.Serialize(_data);

// Write the JSON string to a file
File.WriteAllText(@"D:\path.txt", json);

System.Text.Json (asynchronous serialization)

// Initialize your data
List<data> _data = new List<data>();
_data.Add(new data()
{
    Id = 1,
    SSN = 2,
    Message = "A Message"
});

// Serialize the data to JSON (asynchronously)
using (FileStream createStream = File.Create(@"D:\path.txt"))
{
    await JsonSerializer.SerializeAsync(createStream, _data);
}

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