Why need to truncate StringContent response for JSON.parse

Question

I have written WebApi filter to detect concurrency issues. In action OnActionExecuted I set response content like below:

actionExecutedContext.Response.Content = new System.Net.Http.StringContent( "'{ \"hasValidationErrors\": true, \"validationErrors\": " + System.Web.Helpers.Json.Encode( validationErrors ) + ", \"concurrencyIssue\": true }'", System.Text.Encoding.UTF8, "application/string" );

When I receive it and write to console it looks like on below printscreen

Then, When I try to do:

JSON.parse(response.data)

I get error:

SyntaxError: Unexpected token ' in JSON at position 0

but when I do

JSON.parse( response.data.substring(1, response.data.length - 1) )

it works as expected, mean convert string to json data.

So my question is, why I have to truncate response.data? I gues that, as can be seen in first line on printscreen, there are additional quotemarks. But how can I create my server response to not put them there? And why, when I log response.data ( thrid line on printscreen ), there are only apostrophe, but no quotemarks?

user123456 · Accepted Answer · 2018-07-16 05:31:25Z

1

This means your JSON is not valid. Try to create a model class for your response. Then Parse.

Example :

public class Response
{
   public bool hasValidationErrors;
   //public YourType validationErrors;
   public bool concurrencyIssue;         
 }
 var obj = new Response();
 obj.hasValidationErrors = true;
 obj.concurrencyIssue = true;         
 var jsonString = Newtonsoft.Json.JsonConvert.SerializeObject(obj);
 //Set Your Response

Hope this helpful.

answered Jul 16, 2018 at 5:31

user123456

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1 Comment

user3057544 Over a year ago

thanks a lot - Newtonsoft.Json.JsonConvert.SerializeObject do its job.

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