Sentry Answers>C#>

How to turn an object into a JSON string in C#

How to turn an object into a JSON string in C#

Richard C.

The ProblemJump To Solution

In C# you often need to convert a complex object to JSON to print it to the screen for debugging, or to send over the network to another application. So how do we convert an object like the following to a JSON string?

Click to Copy
class Person { public string Name; public DateTime Birth; public Address Address; } class Address { public string Road; public string Suburb; }

The Solution

Writing JSON is easy in .NET:

  • Import: using System.Text.Json;
  • Convert your object to a string: var json = JsonSerializer.Serialize(alice);

The converter will work only on public properties with getters and setters though. So we have to convert our fields in the introduction to properties:

Click to Copy
using System; using System.Text.Json; class Person { public string Name { get; set; } public DateTime Birth { get; set; } public Address Address { get; set; } } class Address { public string Road { get; set; } public string Suburb { get; set; } } public class Program { public static void Main() { var alice = new Person() { Name = "Alice", Birth = new DateTime(2000, 01, 01), Address = new Address() { Road = "oak", Suburb = "sunnydale" } }; var json = JsonSerializer.Serialize(alice); Console.WriteLine(json); // prints {"Name":"Alice","Birth":"2000-01-01T00:00:00","Address":{"Road":"oak","Suburb":"sunnydale"}} } }

Deserialize JSON Back to an Object

To convert a JSON string back to an object, run deserialize, specifying the class you want to convert the string to:

Click to Copy
var alice2 = JsonSerializer.Deserialize<Person>(json);

You need to surround this code in a try-catch block to handle JSON that does not meet your class definition.


To configure custom JSON conversion settings, like handling trailing commas, comments, and null values, view the Microsoft documentation here.

You can convert with settings like this:

Click to Copy
var settings = new JsonSerializerOptions() {AllowTrailingCommas = true}; var json = JsonSerializer.Serialize(alice, settings);
  • SentryC# Error and Performance Monitoring
  • logo
    Listen to the Syntax Podcast

    Tasty treats for web developers brought to you by Sentry. Get tips and tricks from Wes Bos and Scott Tolinski.


Loved by over 4 million developers and more than 100,000 organizations worldwide, Sentry provides code-level observability to many of the world’s best-known companies like Disney, Peloton, Cloudflare, Eventbrite, Slack, Supercell, and Rockstar Games. Each month we process billions of exceptions from the most popular products on the internet.

© 2024 • Sentry is a registered Trademark
of Functional Software, Inc.