The JSON value could not be converted to Newtonsoft.Json.Linq.JToken. Path: $ | LineNumber: 1 | BytePositionInLine: 8

Question

I have a ASP.Net Core WebApi with a update Action as follows:

   [HttpPut("{id}")]
    public async Task<IActionResult> Campaigns(long id, JObject jobject)
    {

    }

The request and response when I hit this endpoint from postman are below:-

{
"Zone_Code": 1,
"State_Code": 24,
"City_Code": 25,
"Sales_Associate": null,
"Operation_Associate": null,
"Traveller": null,
"Target_Sector": 5,
"Campaign_DateTime": "2020-04-04T00:00:00",
"Format": 2,
"Campaign_Name": "Test",
"Data_Criteria": null,
"IsActive":"Y",
"Stage": "Initiation"
}


{
"type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
"title": "One or more validation errors occurred.",
"status": 400,
"traceId": "|58a198b0-4ac4ca0838cdebce.",
"errors": {
    "$": [
        "The JSON value could not be converted to Newtonsoft.Json.Linq.JToken. Path: $ | LineNumber: 1 | BytePositionInLine: 8."
    ]
}}

Why you use JObject like a parameter of the action?you can use a simple object — Mohammed Sajid
– Mohammed Sajid, Commented Mar 24, 2020 at 13:30
i don't see the handler in your question, i tried a simple test, with JObject gives me the same error, and with a simple object i'm calling the Action. — Mohammed Sajid
– Mohammed Sajid, Commented Mar 25, 2020 at 7:43

DarkSideMoon · Accepted Answer · 2020-10-19 21:11:16Z

35

You have an exception in your code, because you use default json serializer/deserializer in ASP.Net Core WebAPI - System.Text.Json. You can find in documentations, that System.Text.Json doesn't support such deserialization.

You need to switch your default json serializer/deserializer to Newtonsoft.Json, do the following steps:

Install the Microsoft.AspNetCore.Mvc.NewtonsoftJson NuGet package.
In ConfigureServices() add a call to AddNewtonsoftJson()

serviceCollection.AddControllers()
.AddNewtonsoftJson();

For more information about System.Text.Json you can find in Microsoft blog

answered Oct 19, 2020 at 21:11

DarkSideMoon

1,0831 gold badge15 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Goku Over a year ago

Does this still work? When I run command VS isn't able to find the package to install it...

DarkSideMoon Over a year ago

Try command dotnet add package Microsoft.AspNetCore.Mvc.NewtonsoftJson --version 6.0.9, but it is for .net 6.0. If you use the previous version, install another version.

Mark Nadig · Accepted Answer · 2020-07-08 22:56:33Z

5

I believe the root issue is .net core 3 uses System.Text.Json. I believe you want to use System.Text.Json.JsonElement. See https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json-migrate-from-newtonsoft-how-to

answered Jul 8, 2020 at 22:56

Mark Nadig

5,1664 gold badges40 silver badges51 bronze badges

Collectives™ on Stack Overflow

The JSON value could not be converted to Newtonsoft.Json.Linq.JToken. Path: $ | LineNumber: 1 | BytePositionInLine: 8

2 Answers 2

2 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related