C# Newtonsoft.Json.JsonConvert.SerializeObject adding backslashes before double quotes

Question

I have a aspnet web api that returns json using this code:

Project_Model mdl = new Project_Model(transactionId, data);
string json = string.Empty;
json = JsonConvert.SerializeObject(mdl);

and this is the value of the variable “json”:

{\"Pj_Id\":\"23a6bd47-c35a-4ee3-8998-bd0406bc5839\",\"Pj_CUsr_Id\":\"8cb52c3e-25b7-412d-8010-cadd75f1f64b\",\"Pj_Number\":\"test 101\",\"Pj_Name\":\"Test Project 101\",\"Pj_Location\":\"1551 Main St, Houston\"}

But it should look like this:

{
  "Pj_Id": "23a6bd47-c35a-4ee3-8998-bd0406bc5839",
  "Pj_CUsr_Id": "8cb52c3e-25b7-412d-8010-cadd75f1f64b",
  "Pj_Number": "test 101",
  "Pj_Name": "Test Project 101",
  "Pj_Location": "1551 Main St, Houston"
}

I know we will get escape characters like this in the debugger but not in the output. The example above with the backslashes was copied from PostMan’s output of the same API.

Can someone please tell me why this is happening and what can be done to clean it up?

Thanks.

You know that ASP.NET will serialize what you return from it, right? You're probably serializing the JSON yourself and then returning it in a way that causes ASP.NET to also serialize it. — ProgrammingLlama
– ProgrammingLlama, Commented Jul 15, 2021 at 7:32
Ideally you shouldn't be serialising the JSON yourself as it's likely it's being double serialised. Just return mdl from the ASP.Net Web API action method instead of the JSON. — phuzi
– phuzi, Commented Jul 15, 2021 at 7:40

Peter Csala · Accepted Answer · 2021-07-15 09:22:50Z

2

@phuzi was correct in the comment above:

Ideally you shouldn't be serializing the JSON yourself as it's likely it's being double serialized. Just return mdl from the ASP.Net Web API action method instead of the JSON

I was double serializing it. I just returned the class and it came out perfect json.

Thanks.

edited Jul 15, 2021 at 9:22

Peter Csala

23.7k16 gold badges51 silver badges96 bronze badges

answered Jul 15, 2021 at 7:59

spacedog

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