How to encode JSON Url in ASP.NET Core - asp.net-core

Question

I want to make a post to an API, and the link I'm using to make the post call has some URL parameters.
Link to make post: http://someservice/api/v1/requests?input_data=encoded_data
The parameter (input_data) is a JSON that needs to be encoded before.
When I use this link to encode the below JSON, and I add the encoded result to the URL and make the post with Postman, it works just fine.
{
"request":{
"requester":{
"email_id":"**phx#phx.com**"
},
"subject":"**subject**",
"description":"**description something**"
}
}
This is what I have in my method:
[HttpPost]
[Route("projectRequest")]
[Consumes("multipart/form-data")]
public IActionResult CreateConfig([FromForm] ConfigInputModel model) {
try {
var json =
"{" +
"\"request\":{ " +
"\"requester\":{ " +
"\"email_id\" : \" " + model.Requester + " \" " +
"}," +
"\"subject\":\" " + model.Subject + " \" \", " +
"\"description\":\" " + model.Description + " \" \" " +
"}" +
"}";
HttpClient httpClient = new HttpClient();
Encoding utf16le = new UnicodeEncoding(bigEndian: false, byteOrderMark: true,throwOnInvalidBytes: true);
HttpContent content = new StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(json));
var postResponse = httpClient.PostAsync("http://someservice/api/v1/requests?input_data=" +
System.Web.HttpUtility.UrlEncode(json), content);
return Ok(postResponse.Result);
} catch (Exception e) {
return NotFound();
}
}
My question is how can I encode the JSON variable, because I'm getting
"Unable to parse the JSON"
response from the API. I suspect the escape characters in the JSON string I have are causing it, but can't figure it out for quite a while. Thanks.

Answer 1

Instead of writing JSON as a string, would suggest setting the data as object with POCO class or anonymous type. And next, serialize it to a JSON string.
Benefit: Avoid JSON syntax errors.
anonymous type
var json = new {
request = new {
requester = new {
email_id = model.Requester
}
},
subject = model.Subject,
description = model.Description
};
Console.WriteLine(JsonConvert.SerializeObject(json));
Sample program
Output
{"request":{"requester":{"email_id":"Requester"}},"subject":"Subject","description":"Description"}

Answer 2

I test your code in my side and when I using JObject jsonObj = JObject.Parse(json); to transfer your json string, I got the error about request.subject and request.description,
then I found you made a mistake in this place, you should remove what I marked in the screenshot below.