CODEWITHSUNDEEP
c#asp.net-coreasp.net-web-api
Waleed
Waleed

Reputation: 1188

Model binding not working in aspnet core web api

I am working on ASP.NET Core 2.1 Web API project. I am trying to follow this article: https://www.c-sharpcorner.com/article/jwt-json-web-token-authentication-in-asp-net-core/ but I am stuck at Action. My model class just won't bind to the input.

[AllowAnonymous]
[HttpPost]
public IActionResult Login([FromBody] LoginVM loginVM)
{
    IActionResult response = Unauthorized(); // cant reach this point, my breakpoint is here
    var user = AuthenticateUser(new UserModel { });

    if (user != null)
    {
        var tokenString = GenerateJSONWebToken(user);
        response = Ok(new { token = tokenString });
    }

    return response;
}

public class LoginVM
{
    public string Username { get; set; }
    public string Password { get; set; }
}

enter image description here

Upvotes: 6

Views: 4526

Answers (2)

Chris Pratt
Chris Pratt

Reputation: 239220

You're posting as x-www-form-urlencoded, but you have the [FromBody] attribute applied to the action param. These two things are fundamentally incompatible. To accept x-www-form-urlencoded (or multipart/form-data) you must apply the [FromForm] attribute to the param. If you have [FromBody], as you do now, then you can only accept something like application/json or application/xml (if you also enable the XML serializers).

If the issue is that you want to be able to accept both application/json and x-www-form-urlencoded request bodies, that is not possible. You'll need a separate action for each request body encoding, though you can factor out the actual meat of the action into a private method on the controller that both actions can utilize.

Upvotes: 3

Kalimula F
Kalimula F

Reputation: 56

Choose "raw" in Body and "Content-Type" as "application/json" in postman and then try.

Upvotes: 0

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