FluentValidation 7.3.0-beta3

A validation library for .NET that uses a fluent interface to construct strongly-typed validation rules.

Showing the top 20 packages that depend on FluentValidation.

Packages Downloads
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
60
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
59
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
58
FluentValidation.DependencyInjectionExtensions
Dependency injection extensions for FluentValidation
57
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
56
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
55
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
54
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
53
FluentValidation.DependencyInjectionExtensions
Dependency injection extensions for FluentValidation
53

Changes in 7.3:

  • Major changes to AspNetCore integration including better support for collections and implicit validation (opt-in)
  • Marked ValidationException as serializable when running on full framework
  • Fix - Updated EnumValidator's Flags support to handle the ~0 value
  • Fix - TestHelper checking for child validator would respond with the wrong type
  • Fix - Updated translations for some validators
  • Deprected the ValidatorAttribute. It is recommended to use the Service Provider infrastructure (AspNetCore) or an IoC container instead.

Changes in 7.2:

  • Updated AspNetCore integration to support IValidatableObject
  • Updated AspNetCore integration to allow mixing multiple validation strategies in the same model
  • Updated AspNetCore integration to support RulesetForClientsideMessagesAttribute
  • Fix - Property names were not generated properly for nested types when using AddFailure inside a Custom validator
  • Fix - NullReferenceException when using CustomAsync but the validator is invoked synchronously
  • Fix - Clientside integration in AspNetCore being resolved from the root-level service provider
  • Fix - Allow empty string to be passed to OverridePropertyName

Changes in 7.1.1:

  • Fix - Incorrect property name was generated when using RuleForEach combined with SetValidator
  • Fix - Nesting async validators inside DependentRules didn't wait for completion

Changes in 7.1:

  • New RuleFor().Custom() method as a replacement for the old, deprecated Custom method
  • Improved messages in the ShouldHaveChildValidator test extension
  • Test helper works with nested properties
  • Additional overload of WithState allows access to collection item when used with RuleForEach
  • Fix - Wrong values were generated as part of the MVC5 clientside integration for MinLength and MaxLength validators
  • Fix - AssemblyScanner now excludes abstract and generic types
  • Fix - InvalidCastException when using lazy WithMessage combined with RuleForEach
  • WithState enhanced to allow access to the ValidationContext

Changes in 7.0:

7.0 is a major release that contains several breaking changes, especially with Localization. If you use FluentValidation's support for localization please read the updated documentation: https://github.com/JeremySkinner/FluentValidation/wiki/f.-Localization

  • Localization rewrite to not require satellite assemblies

  • New 'Custom' rule method replaces the root-level Custom method

  • Switch to Netstandard based build process

  • Assemblies are now signed / strongly named - see https://github.com/JeremySkinner/FluentValidation/wiki/l.-Strong-naming-and-signed-packages

  • Fix - Possible NullReferenceException in the AspNetCore clientside integration for length validators

  • Fix - Don't clear the ModelValidatorProviders collection by default in the AspNetCore integration (added new ClearValidatorProviders property to control this behaviour)

  • Fix - Ensure IValidatorFactory is resolved from request scope in asp.net core integration

  • Fix - Property getter that throws an exception causes validation to fail in WebApi integration

  • Fix - Issue in AspNetCore integration where we tried to resolve a collection validator in some situations where a class validator should be used

  • Fix - Incorrect clientside validation attributes generated for email validator and credit card validator in the asp.net core integration

  • Fix - Child model validation now works in webapi integration

  • Improve splitting of PascalCased property names to support uppercase character sequences

  • ValidationResult.ErrorCode property now always returns the type of the PropertyValidator that generated the message, unless it's been explicitly overriden

    Full release notes can be found at https://github.com/JeremySkinner/FluentValidation/blob/master/Changelog.txt

.NET Framework 4.5

  • No dependencies.

.NET Standard 1.0

.NET Standard 2.0

  • No dependencies.

Version Downloads Last updated
12.2.0 13 10/10/2026
12.1.1 70 12/12/2025
12.1.0 49 12/14/2025
12.0.0 53 12/12/2025
12.0.0-preview1 41 12/11/2025
11.12.0 53 12/14/2025
11.11.0 49 12/15/2025
11.10.0 44 12/18/2025
11.9.2 43 12/28/2025
11.9.1 37 12/11/2025
11.9.0 50 12/17/2025
11.8.1 35 12/28/2025
11.8.0 45 12/12/2025
11.7.1 50 12/15/2025
11.7.0 44 12/14/2025
11.6.0 46 12/13/2025
11.5.2 36 12/13/2025
11.5.1 35 12/12/2025
11.5.0 43 12/28/2025
11.4.0 43 12/28/2025
11.3.0 40 12/28/2025
11.2.2 44 12/13/2025
11.2.1 40 12/13/2025
11.2.0 32 12/25/2025
11.1.1 33 12/28/2025
11.1.0 32 12/22/2025
11.0.3 52 12/13/2025
11.0.2 38 12/14/2025
11.0.1 46 12/14/2025
11.0.0 43 12/27/2025
10.4.0 51 12/28/2025
10.3.6 44 12/21/2025
10.3.5 47 12/22/2025
10.3.4 32 12/18/2025
10.3.3 39 12/13/2025
10.3.1 48 12/28/2025
10.3.0 47 12/12/2025
10.2.3 41 12/11/2025
10.2.2 35 12/18/2025
10.2.1 40 12/11/2025
10.2.0 41 12/13/2025
10.1.0 41 12/28/2025
10.0.4 37 12/28/2025
9.5.4 41 12/18/2025
9.5.3 44 12/28/2025
9.5.2 7 09/30/2026
9.5.1 41 12/24/2025
9.5.0 36 12/13/2025
9.4.0 33 12/28/2025
9.3.0 37 12/28/2025
9.3.0-preview3 39 12/28/2025
9.3.0-preview2 41 12/28/2025
9.3.0-preview1 45 12/28/2025
9.2.2 46 12/14/2025
9.2.1 38 12/28/2025
9.2.0 54 12/20/2025
9.1.3 33 12/11/2025
9.1.2 42 12/13/2025
9.1.1 36 12/18/2025
9.1.0 38 12/20/2025
9.0.1 36 12/13/2025
9.0.0-preview5 36 12/23/2025
9.0.0-preview4 30 12/14/2025
9.0.0-preview3 42 12/18/2025
9.0.0-preview2 33 12/28/2025
9.0.0-preview1 35 12/28/2025
8.6.3 35 12/14/2025
8.6.2 30 12/25/2025
8.6.1 50 12/20/2025
8.6.0 44 12/15/2025
8.5.1 39 12/28/2025
8.5.0 40 12/14/2025
8.5.0-preview5 45 12/23/2025
8.5.0-preview4 32 12/13/2025
8.5.0-preview3 34 12/24/2025
8.5.0-preview2 38 12/18/2025
8.5.0-preview1 32 12/15/2025
8.4.0 47 12/16/2025
8.3.0 42 12/20/2025
8.2.3 32 12/20/2025
8.2.2 40 12/13/2025
8.2.1 44 12/20/2025
8.2.0 33 12/28/2025
8.1.3 35 12/20/2025
8.1.2 39 12/28/2025
8.1.1 35 12/28/2025
8.1.0 35 12/28/2025
8.1.0-preview2 39 12/28/2025
8.1.0-preview1 47 12/28/2025
8.0.101 43 12/14/2025
8.0.100 37 12/28/2025
8.0.0 31 12/13/2025
8.0.0-rc1 34 12/28/2025
8.0.0-preview4 33 12/22/2025
8.0.0-preview3 46 12/25/2025
8.0.0-preview2 36 12/28/2025
7.6.105 35 12/21/2025
7.6.104 42 12/24/2025
7.6.103 38 12/18/2025
7.6.102 38 12/15/2025
7.6.101 41 12/28/2025
7.6.100 33 12/13/2025
7.6.0 32 12/21/2025
7.6.0-preview1 42 12/14/2025
7.5.2 55 12/13/2025
7.5.1 30 12/20/2025
7.5.0 31 12/25/2025
7.4.0 37 01/03/2026
7.3.4 49 12/18/2025
7.3.3 41 12/28/2025
7.3.2 36 12/14/2025
7.3.1 35 12/15/2025
7.3.0 30 12/28/2025
7.3.0-beta3 36 12/28/2025
7.3.0-beta2 39 12/21/2025
7.3.0-beta1 41 12/28/2025
7.2.1 33 12/20/2025
7.2.0 46 12/28/2025
7.2.0-beta3 34 12/28/2025
7.2.0-beta2 42 12/28/2025
7.2.0-beta1 37 12/28/2025
7.1.1 33 12/15/2025
7.1.0 35 12/28/2025
7.1.0-beta1 41 12/18/2025
7.0.3 38 12/28/2025
7.0.2 35 12/28/2025
7.0.1 36 12/12/2025
7.0.0 36 12/14/2025
7.0.0-beta3 35 12/17/2025
7.0.0-beta2 43 12/24/2025
7.0.0-beta1 38 12/15/2025
6.4.1 33 12/20/2025
6.4.1-beta1 45 12/28/2025
6.4.0 49 12/18/2025
6.4.0-rc4 50 12/28/2025
6.4.0-rc3 36 12/28/2025
6.4.0-rc2 33 12/28/2025
6.4.0-rc1 45 12/28/2025
6.4.0-beta9 44 12/18/2025
6.4.0-beta8 39 12/28/2025
6.4.0-beta7 46 12/13/2025
6.4.0-beta6 42 12/13/2025
6.4.0-beta5 37 12/28/2025
6.4.0-beta4 47 12/28/2025
6.4.0-beta3 50 12/27/2025
6.4.0-beta2 39 12/28/2025
6.4.0-beta10 43 12/28/2025
6.4.0-beta1 44 12/13/2025
6.3.4-alpha 42 12/28/2025
6.3.3-alpha 42 12/23/2025
6.2.1 39 12/14/2025
6.2.1-beta1 36 12/28/2025
6.2.0 45 12/13/2025
6.2.0-beta1 43 12/28/2025
6.1.0 32 01/08/2026
6.0.2 40 12/14/2025
6.0.1 6 09/29/2026
6.0.0 39 12/14/2025
5.6.2 41 01/05/2026
5.6.1 34 12/14/2025
5.5.0 43 12/14/2025
5.4.0 38 01/12/2026
5.3.0 31 01/13/2026
5.2.0 45 12/14/2025
5.1.0 45 12/11/2025
5.0.0.1 30 12/28/2025
4.0.0.1 34 12/28/2025
4.0.0 6 09/29/2026
3.4.6 38 12/14/2025
3.4.0 42 12/14/2025
3.3.1 34 12/14/2025
3.2.0 44 12/14/2025
3.1.0 39 12/12/2025
3.0.0.1 40 12/12/2025
3.0.0 46 12/20/2025
2.0.0 48 12/29/2025
1.3.0 43 12/13/2025