POST data is null with ASP.NET API Controller

Question

I am trying to migrate to an ASP.NET 6 API controller and my POST data from my JS function is showing as null.

I have the following json request:

// searchTerms is an array with 2 properties, Value and Type
$.ajax({
    type: 'Post',
    contentType: 'application/json',
    dataType: "json",
    data: JSON.stringify({
        searchTerms
    })

if I POST this to an ASP.NET 6 MVC controller:

public ActionResult Search(List<SearchTerm> searchTerms)

Then my searchTerms list is properly populated.

If I POST to an API Controller

[System.Web.Http.HttpPost]
[System.Web.Http.Route("api/search")]
public IHttpActionResult Search([FromBody] List<SearchTerm> searchTerms)

Then searchTerms is null.

I have tried to change the contentType, dataType, remove the stringify function to no avail.

I have tried to changed the signature to

public IHttpActionResult Search([FromBody] dynamic value)

And see the following, so obviously I'm not binding properly?

Here is my SearchTerm model:

public class SearchTerm
{
    public string Value { get; set; }
    public string Type { get; set; }
}

I think you're passing a model which has a list of SearchTerms in it instead of passing a list directly. But that's just a guess. — Werner
– Werner, Commented Nov 7, 2017 at 8:05

Kirk Larkin · Accepted Answer · 2017-11-07 08:05:30Z

4

Instead of:

data: JSON.stringify({
    searchTerms
})

Change your $.ajax call to use just:

data: JSON.stringify(searchTerms)

You are sending JSON that looks something like:

{
    "seachTerms": [
        ...
    ]
}

With the change I suggested, this would just be a simple JSON array, which should work in your example.

answered Nov 7, 2017 at 8:05

Kirk Larkin

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2 Comments

Robbie Mills Over a year ago

Quick question, how do I now add other paramaters? (ie, an integer)

Kirk Larkin Over a year ago

Have a look at @Nkosi's answer here: stackoverflow.com/a/44599682/2630078 and be sure to upvote his answer if it helps.

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