Send a list of strings to an ASP.net api controller with vanilla Javascript

Question

Send a list of strings to an ASP.net core api controller with vanilla Javascript

This might sound simple but something is going wrong and i'm not sure what. I am trying to send a list of strings such as [ "something", "something else", "Another string" ] to my api post controller in ASP.Net Core.

My Controller looks like this

[HttpPost]
        public ActionResult<MyModel> Name([FromBody] List<string> list)
        {

            // Do something... 

            return NoContent();
        }

And my Javascript looks like this

async function apiCall() {

                const response = await fetch("URL", {
                    method: 'POST',
                    headers: {
                        'Content-type': 'application/json',
                        'X-CSRFToken': csrftoken
                    },
                    body: JSON.stringify({ list: [ "something", "something else", "Another string" ] })
                }}

When ever I call the apiCall() funcation it posts data to the controller but the data List is always null. How do I correctly post this data?

Your model is not an array of string, but an object with an array of string as property, all the best — invernomuto
– invernomuto, Commented Apr 25, 2020 at 14:28
Thanks it was an easy fix. When I change the body to body: JSON.stringify([ "something", "something else", "Another string" ]) It works! — RJGMorris
– RJGMorris, Commented Apr 25, 2020 at 14:32

RJGMorris · Accepted Answer · 2020-04-25 14:35:45Z

1

Change

body: JSON.stringify({ list: [ "something", "something else", "Another string" ] })

To

body: JSON.stringify([ "something", "something else", "Another string" ])

And it works. I was not sending an array of strings but an object with an array of strings as a property.

answered Apr 25, 2020 at 14:35

RJGMorris

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