Respect JsonSerializerOptions casing for property names in validation errors #62036

Copilot · 2025-05-20T23:20:02Z

Summary

When configuring JSON serialization options with a custom property naming policy (like camelCase), validation error responses were not consistently following the same naming policy for property names. This created a disconnect between what clients send/expect and what the validation errors contained.

The implemented changes ensure validation errors respect the configured JSON naming policy, making them consistent with the rest of the API's JSON formatting.

Changes

Added a SerializerOptions property to ValidateContext to access JSON naming policies
Modified the ValidationEndpointFilterFactory to pass the JSON options from DI to the validation context
Implemented property formatting that respects PropertyNamingPolicy for error key names
Added comprehensive tests for different naming policies, nested properties, and array indices
Properly handles complex property paths with dots and array indices (items[0].productName → items[0].productName)

Before

{
  "type": "https://tools.ietf.org/html/rfc9110#section-15.5.41",
  "title": "One or more validation errors occurred.",
  "status": 400,
  "errors": {
    "LastName": [
      "The LastName field is required."
    ]
  }
}

After

{
  "type": "https://tools.ietf.org/html/rfc9110#section-15.5.41",
  "title": "One or more validation errors occurred.",
  "status": 400,
  "errors": {
    "lastName": [
      "The LastName field is required."
    ]
  }
}

The implementation preserves the full compatibility with existing usage while ensuring that property names in validation errors now follow the configured naming policy.

Fixes #61764.

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…ation errors Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

captainsafia

Good start! Left some comments inline.

src/Http/Http.Abstractions/src/Validation/ValidateContext.cs

src/Http/Http.Abstractions/test/Validation/ValidateContextTests.cs

src/Http/Routing/src/ValidationEndpointFilterFactory.cs

Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Copilot · 2025-05-21T00:56:42Z

Good start! Left some comments inline.

I've addressed all the inline comments. Made the SerializerOptions property internal, removed the test file, and updated ValidationEndpointFilterFactory to use the internal property via reflection. All changes in commit 216406a.

src/Http/Http.Abstractions/src/Validation/ValidateContext.cs

… from service provider Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

src/Http/Http.Abstractions/src/Validation/ValidateContext.cs

Copilot · 2025-05-21T01:27:21Z

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You can ask me to try again later by mentioning me in a new comment.

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captainsafia · 2025-05-21T15:29:42Z

@copilot Let's try to address the review comments I left for you earlier. You were on the right track with making the SerializerOptions property public and setting it in the ValidationEndpointFilterFactory based on the way our assembly references are structured.

… complex keys Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

captainsafia

We're almost there! One more comment. Also, be undo all the changes you made to the package.json files and remove the package.json.bak files.

src/Http/Routing/src/ValidationEndpointFilterFactory.cs

…tions Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

captainsafia · 2025-05-21T16:19:32Z

@copilot Revert any changes made to package.json and package-lock.json files to their state in main.

captainsafia · 2025-05-22T00:22:43Z

@copilot it looks like some tests in ValidatableTypeInfoTests and ValidationsGeneratorTests are failing. Can you fix them?

captainsafia · 2025-05-28T19:31:54Z

@copilot Can you fix this build error by adding the correct attribute to the constructor?

/_/src/Http/Http.Abstractions/src/Validation/ValidatablePropertyInfo.cs(30,9): error IL2069: (NETCORE_ENGINEERING_TELEMETRY=Build) Microsoft.AspNetCore.Http.Validation.ValidatablePropertyInfo.ValidatablePropertyInfo(Type, Type, String, String): value stored in field 'Microsoft.AspNetCore.Http.Validation.ValidatablePropertyInfo.<DeclaringType>k__BackingField' does not satisfy 'DynamicallyAccessedMemberTypes.PublicConstructors' requirements. The parameter 'declaringType' of method 'Microsoft.AspNetCore.Http.Validation.ValidatablePropertyInfo.ValidatablePropertyInfo(Type, Type, String, String)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.

…idatablePropertyInfo constructor Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Copilot · 2025-05-28T19:41:03Z

@copilot Can you fix this build error by adding the correct attribute to the constructor?

...

Fixed the build error by adding DynamicallyAccessedMemberTypes.PublicConstructors to the constructor parameter attribute in commit 2f5b553.

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captainsafia · 2025-05-29T04:07:15Z

@copilot I've made some fixes to the implementation and want you to follow up on some things, including:

HasDisplayAttribute is called each type a type is validated. Can you update the implementation to call it once and cache it on the ValidatablePropertyInfo?
The performance of the FormatComplexKey method can probably be improved. Can we cache the JSON naming policy on the ValidateContext? Are there other improvements that we can make here?

Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Copilot · 2025-05-29T04:19:20Z

@copilot I've made some fixes to the implementation and want you to follow up on some things, including:

HasDisplayAttribute is called each type a type is validated. Can you update the implemen...

I've implemented both performance improvements in commit 409bb34:

HasDisplayAttribute caching: Added _hasDisplayAttribute field to cache reflection result in constructor, eliminating repeated calls during validation
FormatComplexKey optimization: Cached the JSON naming policy in ValidateContext and made the method static with the naming policy as a parameter, reducing property access overhead and redundant null checks

Warning

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Add the appropriate URLs or hosts to my firewall allow list

src/Http/Http.Abstractions/src/Validation/ValidatableParameterInfo.cs

Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Copilot · 2025-05-29T05:34:33Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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captainsafia · 2025-05-30T16:18:49Z

@DeagleGross @BrennanConroy Would love your review n this PR. Outside of the prompting, I ended up making local changes on 59069f7 (#62036) and f035b35 (#62036).

Some things here:

We need to add JsonSerializerOptions as a property on the ValidateContext since we don't have access to the JsonOptions type in the Http.Abstractions assembly in order to be able to resolve it ourselves in the ValidatableTypes. I think that probably makes the most sense for frameworks who are building on top of the abstractions API anyways.
When I asked Copilot to add support for formatting the keys in the validation result, it used the strategy that I removed in this commit. I played around with why it chose this instead of relying on the fact that we format the names in the ValidatableTypes. The only impacted scenario was the IValidatableObject one so I created a specific one for tat.
The precedence ordering is [Display(Name = "")], then [JsonPropertyName] then the JSON naming policy.

Initial plan for issue

d3d01af

Copilot AI assigned Copilot and captainsafia May 20, 2025

Copilot started work on behalf of captainsafia May 20, 2025 23:20 View session

dotnet-policy-service bot added the Attention: Shared Code Modified label May 20, 2025

Add support for JsonSerializerOptions property naming policy in valid…

03af06c

…ation errors Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Respect JsonSerializerOptions casing for property names in validation errors~~ Respect JsonSerializerOptions casing for property names in validation errors May 20, 2025

Copilot AI requested a review from captainsafia May 20, 2025 23:49

Copilot finished work on behalf of captainsafia May 20, 2025 23:49

captainsafia reviewed May 21, 2025

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Copilot started work on behalf of captainsafia May 21, 2025 00:41 View session

Make SerializerOptions property internal and retrieve options from DI

216406a

Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Copilot finished work on behalf of captainsafia May 21, 2025 00:57

captainsafia reviewed May 21, 2025

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Refactor SerializerOptions property to dynamically access JsonOptions…

f92b43e

… from service provider Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

captainsafia reviewed May 21, 2025

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Copilot finished work on behalf of captainsafia May 21, 2025 01:27

Copilot started work on behalf of captainsafia May 21, 2025 15:29 View session

Made SerializerOptions property public and added tests for formatting…

0900ced

… complex keys Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Copilot finished work on behalf of captainsafia May 21, 2025 15:47

captainsafia mentioned this pull request May 21, 2025

Update copilot-instructions.md #62046

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captainsafia reviewed May 21, 2025

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Copilot started work on behalf of captainsafia May 21, 2025 15:56 View session

Update ValidationEndpointFilterFactory to use type-safe DI for JsonOp…

2694d90

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captainsafia added 2 commits May 28, 2025 19:00

Update tests and fix implementation for more cases

59069f7

Merge branch 'main' into copilot/fix-61764-2

10a3187

Copilot started work on behalf of captainsafia May 28, 2025 19:31 View session

Add PublicConstructors to DynamicallyAccessedMembers attribute in Val…

2f5b553

…idatablePropertyInfo constructor Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Copilot finished work on behalf of captainsafia May 28, 2025 19:41

captainsafia added 3 commits May 28, 2025 18:25

Merge branch 'main' into copilot/fix-61764-2

0ba6127

Fix test after rebase

f45c25a

Merge branch 'main' into copilot/fix-61764-2

d0e29c8

Copilot started work on behalf of captainsafia May 29, 2025 04:07 View session

Cache HasDisplayAttribute and optimize FormatComplexKey performance

409bb34

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Copilot finished work on behalf of captainsafia May 29, 2025 04:20

captainsafia reviewed May 29, 2025

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Copilot started work on behalf of captainsafia May 29, 2025 05:26 View session

Remove JSON naming policy formatting from ValidatableParameterInfo

3cab762

Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Copilot finished work on behalf of captainsafia May 29, 2025 05:34

Move key formatting to ValidatableTypeInfo

f035b35

captainsafia force-pushed the copilot/fix-61764-2 branch from 4afa2bb to f035b35 Compare May 30, 2025 04:30

captainsafia marked this pull request as ready for review May 30, 2025 15:53

captainsafia requested review from halter73 and BrennanConroy as code owners May 30, 2025 15:53

captainsafia requested a review from DeagleGross May 30, 2025 15:54

Respect JsonSerializerOptions casing for property names in validation errors #62036

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