How to receive json data in web api?

Question

I am using .net core web api but I can not receive json data.

public async Task<IActionResult>PostAsync(string username,string password)

{

}

the username=null and password is null .

someone tell me should add [FromBody] but I can only add one.

and I do not want to put the parameter in a class object.

I only want to use the seperate parameter.

Answer 1

someone tell me should add [FromBody] but I can only add one. and I do not want to put the parameter in a class object. I only want to use the separate parameter.

Your requirement is not possible by design in Web API Core. You'll need to write custom middleware to accomplish this task.

Answer 2

its simple:

public class PostRq
{
      public string username {get; set;}
      public string password {get; set;}
}

 public async Task<IActionResult>PostAsync(PostRq rq)
 {
       Console.WriteLine(rq.username);
       ...
 }

in javascript call:

var response = await fetch(url, {
    method: "POST",
    headers: {"Content-Type": "application/json"},
    data: JSON.stringify({username, password})
}).then(r => r.json());

Answer 3

Hi @mc ,

 [HttpPost]  
public async Task<IActionResult> PostAsync( string username,  string password)  
{   
    return Ok("Success");  
}  

By using the above code, to transfer parameter to the method, you can use the Query String method: add the parameter at the end of the request url, like this: https://localhost:44310/api/todo?username=Jack&password=abc123

Then, the result as below:

If you want to transfer the data from request body and use json format, it is better to create a model, then use the following script to get send the parameter:

you can download the code from here

The result as below:

Besides, you can also try to get the parameter from the form, check the following sample code:

JavaScript code: use the FormData object to transfer data:

Controller:

    [HttpPost]  
    public async Task<IActionResult> PostAsync([FromForm]string username,  [FromForm]string password)  
    {   
        return Ok("Success");  
    }  

The result as below: when using Postman, select the form-data:

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Best Regards,
Dillion