How to post string array using POSTMAN?

Question

I am using Postman to send an array of string to a web API. The web API method looks like:

[HttpPost]
public async Task<IEnumerable<DocumentDTO>> GetDocuments([FromBody]IEnumerable<string> documentNames)
{
    return await _service.GetDocuments(documentNames);
}

I saw this SO post on how to send an array using Postman. Here is how I am sending the array:

Fiddler shows the request's content type is multipart/form-data;

But I am getting an error response:

{ "Message": "The request entity's media type 'multipart/form-data' is not supported for this resource.", "ExceptionMessage": "No MediaTypeFormatter is available to read an object of type 'IEnumerable1' from content with media type 'multipart/form-data'.", "ExceptionType": "System.Net.Http.UnsupportedMediaTypeException", "StackTrace": " at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\r\n at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)" }

I have tried setting the key as documentNames,documentNames[], documentNames[0].

I have tried selecting the body as x-www-form-urlencoded. When I do that, the API receives an empty collection.

I have tried selecting a body as raw. When I do that, the API receives null as a parameter.

Questions

How do I send a string array using form-data?
How do I send a string array using x-www-form-urlencoded?
How do I send a string array as raw JSON?

Rahul · Accepted Answer · 2016-09-23 18:37:16Z

29

Pass it as JSON array and select the raw option like below

For a API method signature

    public void Post([FromBody] IEnumerable<string> value)
    {
      //some processing
    }

answered Sep 23, 2016 at 18:37

Rahul

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2 Comments

Omar Isaid Over a year ago

Thank you , I used same idea for list of complex objects and it works fine for me

Ben Over a year ago

so simple and I was fiddling with it for such a long time. it came to my surprise that passing it as { value:[1,2,3] } cannot be recognized by the request handler.

WasiF · Accepted Answer · 2021-04-15 07:21:38Z

21

if you want to initialize an array via params, you can do that.

use a `variable` with a same name

edited Apr 15, 2021 at 7:21

answered Nov 8, 2018 at 12:08

WasiF

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2 Comments

Anmol Jain Over a year ago

This is not working.

WasiF Over a year ago

@AnmolJain This worked for me and many others. Please check your code. In case you find better way than this, post a comment and I'll update the answer.

Hà Mã Tím · Accepted Answer · 2021-06-29 02:55:04Z

7

Use same key in form remember add [] on it

answered Jun 29, 2021 at 2:55

Hà Mã Tím

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1 Comment

Manas Over a year ago

adding[] works, specially when we json_encode to save it as a string in our database. if you do categories[0] / categories[1] it will create key value pairs and the value arriving at the server will not be in a single array

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