JsonMatcher should serialize enum as text if such attribute is defined #425

New Issue

2025-12-29T08:28:00+01:00

adam commented

2025-12-29 08:28:00 +01:00

Originally created by @ghost on GitHub (Jul 8, 2022).

Describe the bug

The JsonMatcher does not respect the enum serialization attributes

Expected behavior:

The matcher should match on a json containing the enum as a string instead of a number

Test to reproduce

public enum MyType
{
	[JsonConverter(typeof(StringEnumConverter))]  // newtonsoft
	Type1
}

public class Request
{
	public MyType MyType { get; set; }
}

var request = new MyRequest { MyType = MyType.Type1 };

In the WireMock Given definition:

.WithBody(new JsonMatcher(MatchBehaviour.AcceptOnMatch, request, true))

The request won't be matched because the json matcher (see its private _valueAsJToken) tries to match on MyEnum = 0, instead of MyType1

Other related info

What serializer is used? Is there a way to tweak it so it serializes enums as strings?

Originally created by @ghost on GitHub (Jul 8, 2022). ### Describe the bug The JsonMatcher does not respect the enum serialization attributes ### Expected behavior: The matcher should match on a json containing the enum as a string instead of a number ### Test to reproduce ``` public enum MyType { [JsonConverter(typeof(StringEnumConverter))] // newtonsoft Type1 } public class Request { public MyType MyType { get; set; } } var request = new MyRequest { MyType = MyType.Type1 }; ``` In the WireMock Given definition: ``` .WithBody(new JsonMatcher(MatchBehaviour.AcceptOnMatch, request, true)) ``` The request won't be matched because the json matcher (see its private _valueAsJToken) tries to match on MyEnum = 0, instead of MyType1 ### Other related info What serializer is used? Is there a way to tweak it so it serializes enums as strings?

adam added the question label 2025-12-29 08:28:00 +01:00

adam closed this issue

2025-12-29 08:28:00 +01:00

adam commented

2025-12-29 08:28:00 +01:00

@StefH commented on GitHub (Jul 8, 2022):

@FredCni
Can you make a full working example project, or a PullRequest with a new unit-test which demonstrates this error?

@StefH commented on GitHub (Jul 8, 2022): @FredCni Can you make a full working example project, or a PullRequest with a new unit-test which demonstrates this error?

adam commented

2025-12-29 08:28:00 +01:00

@StefH commented on GitHub (Jul 9, 2022):

#770

@StefH commented on GitHub (Jul 9, 2022): #770

adam commented

2025-12-29 08:28:01 +01:00

@StefH commented on GitHub (Jul 9, 2022):

@FredCni
The attribute is wrongly placed. Use this:

[JsonConverter(typeof(StringEnumConverter))]
public enum MyType
{
	Type1
}

@StefH commented on GitHub (Jul 9, 2022): @FredCni The attribute is wrongly placed. Use this: ``` csharp [JsonConverter(typeof(StringEnumConverter))] public enum MyType { Type1 } ```

adam commented

2025-12-29 08:28:01 +01:00

@ghost commented on GitHub (Jul 11, 2022):

Thank you, that fixed it!

@ghost commented on GitHub (Jul 11, 2022): Thank you, that fixed it!

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Branches Tags

master

dependabot/nuget/src/WireMock.Net.AspNetCore.Middleware/System.Text.Json-8.0.5

1341-mapping-json

stef-aspire-tests-updates

bug/973-TinyMapper

bug/1149-AppendGuidToSavedMappingFile

feature/1150-DockerImageVersion

61

stef-1108

stef-1097

stef-1083-MessageOptions_Type_Conflict

stef-1062-logger

stef-IgnoreOpenApiErrors

stef-928-TypeLoadException-FluentAssertions-net472

nunit

stef-849

stef-847-regex-questionmark

http_verb

WireMockServerContext

webapp

ai

CommandLineArgumentsParser

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Reference: starred/WireMock.Net#425