JSON serialization/deserialization in ASP.Net Core

Question

Since there is no JavaScriptSerializer, what native implementation can be used to handle this?

I noticed JsonResult and I can format data to JSON with this, but how do I deserialize?

Or maybe I am missing some dependencies in project.json?

score 257 · Accepted Answer · edited Jul 17 '20 at 18:17

You can use Newtonsoft.Json, it's a dependency of Microsoft.AspNet.Mvc.ModelBinding which is a dependency of Microsoft.AspNet.Mvc. So, you don't need to add a dependency in your project.json.

#using Newtonsoft.Json
....
JsonConvert.DeserializeObject(json);

Note, using a WebAPI controller you don't need to deal with JSON.

UPDATE ASP.Net Core 3.0

Json.NET has been removed from the ASP.NET Core 3.0 shared framework.

You can use the new JSON serializer layers on top of the high-performance Utf8JsonReader and Utf8JsonWriter. It deserializes objects from JSON and serializes objects to JSON. Memory allocations are kept minimal and includes support for reading and writing JSON with Stream asynchronously.

To get started, use the JsonSerializer class in the System.Text.Json.Serialization namespace. See the documentation for information and samples.

To use Json.NET in an ASP.NET Core 3.0 project:

Add a package reference to Microsoft.AspNetCore.Mvc.NewtonsoftJson
Update ConfigureServices to call AddNewtonsoftJson().

    services.AddMvc()
        .AddNewtonsoftJson();

Read Json.NET support in Migrate from ASP.NET Core 2.2 to 3.0 Preview 2 for more information.

Now AspNetCore.Mcv has no dependencies on Newtonsoft.JSON . Microsoft.AspNet.Mvc.Formatters.Json assembly used for serialization. — Roman Pokrovskij, Nov 16 '16 at 07:31
@RomanPokrovskij, wrong, : `Microsoft.AspNetCore.Mvc.Formatters.Json` has a dependency to `Microsoft.AspNetCore.JsonPatch` which has a dependency to `Newtonsoft.Json` 9.0.1 https://www.nuget.org/packages/Microsoft.AspNetCore.Mvc.Formatters.Json/, https://www.nuget.org/packages/Microsoft.AspNetCore.JsonPatch/ — agua from mars, Nov 16 '16 at 11:09
You can also use JsonConvert.DeserializeObject(json) to deserialize to an specific class. — Nuno Ribeiro, Mar 22 '19 at 11:25

score 45 · Answer 2 · edited Feb 12 '22 at 22:02

45

.net core

using System.Text.Json;

###To serialize

var jsonStr = JsonSerializer.Serialize(MyObject)

###Deserialize

var weatherForecast = JsonSerializer.Deserialize<MyObject>(jsonStr);

For more information about excluding properties and nulls check out This Microsoft site

edited Feb 12 '22 at 22:02

jutky

3,895
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answered Feb 16 '20 at 14:14

NoloMokgosi

1,678
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3

do you know how to deserialize json to dynamic type? – zolty13 May 25 '20 at 14:03
1

Be aware that System.Text.Json is a "lossy" serializer and will not include properties that are on base classes. – StingyJack Dec 14 '20 at 15:43

JSON serialization/deserialization in ASP.Net Core

2 Answers2

UPDATE ASP.Net Core 3.0

Linked