FluentValidation 8.1.0-preview2

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
45
FluentValidation.DependencyInjectionExtensions
Dependency injection extensions for FluentValidation
40
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
38
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
36
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
35
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
34
FluentValidation.AspNetCore
AspNetCore integration for FluentValidation
33

FluentValidation 8 is a major release. Please read the upgrade notes at https://fluentvalidation.net/upgrading-to-8

Changes in 8.1:

  • Add format support in message placeholders.
  • Added support for overriding indexers for collection rules.
  • Allow error codes to be used to override localization key in the Language Manager.
  • Additional error details are now shown in the ShouldNotHaveValidationErrorFor test extension.
  • Conditions defined with root-level When/WhenAsync/Unless/UnlessAsync are now only executed once (instead of once for each rule).
  • Support Otherwise method chained from root-level When/WhenAsync/Unless/UnlessAsync.
  • Minor wording changes to default English error messages.

Changes in 8.0:

  • Support validating only specific properties by path.
  • Added OnFailure method
  • Deprecated RuleFor(..).SetCollectionValidator in favour of RuleForEach(...).SetValidator
  • IStringSource.GetString now takes a validation context instead of a model instance.
  • Introduce PropertyValidatorOptions in order to clean up the IPropretyValidator interface.
  • Moved the legacy ValidatorAttribute and AttributedValidatorFactory into a separate FluentValidation.Attributes package.
  • Remove the pre-7.0 localization mechanism
  • Remove the pre-7.0 methods for custom validation
  • Removed many other deprecated methods

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

Version Downloads Last updated
12.1.1 40 12/12/2025
12.1.0 33 12/14/2025
12.0.0 37 12/12/2025
12.0.0-preview1 24 12/11/2025
11.12.0 40 12/14/2025
11.11.0 34 12/15/2025
11.10.0 28 12/18/2025
11.9.2 29 12/28/2025
11.9.1 26 12/11/2025
11.9.0 29 12/17/2025
11.8.1 25 12/28/2025
11.8.0 32 12/12/2025
11.7.1 32 12/15/2025
11.7.0 30 12/14/2025
11.6.0 32 12/13/2025
11.5.2 23 12/13/2025
11.5.1 25 12/12/2025
11.5.0 31 12/28/2025
11.4.0 30 12/28/2025
11.3.0 27 12/28/2025
11.2.2 30 12/13/2025
11.2.1 28 12/13/2025
11.2.0 20 12/25/2025
11.1.1 24 12/28/2025
11.1.0 25 12/22/2025
11.0.3 35 12/13/2025
11.0.2 29 12/14/2025
11.0.1 33 12/14/2025
11.0.0 35 12/27/2025
10.4.0 32 12/28/2025
10.3.6 26 12/21/2025
10.3.5 28 12/22/2025
10.3.4 22 12/18/2025
10.3.3 27 12/13/2025
10.3.1 34 12/28/2025
10.3.0 36 12/12/2025
10.2.3 26 12/11/2025
10.2.2 26 12/18/2025
10.2.1 28 12/11/2025
10.2.0 31 12/13/2025
10.1.0 26 12/28/2025
10.0.4 24 12/28/2025
9.5.4 30 12/18/2025
9.5.3 27 12/28/2025
9.5.2 27 12/09/2025
9.5.1 30 12/24/2025
9.5.0 25 12/13/2025
9.4.0 22 12/28/2025
9.3.0 23 12/28/2025
9.3.0-preview3 26 12/28/2025
9.3.0-preview2 25 12/28/2025
9.3.0-preview1 27 12/28/2025
9.2.2 33 12/14/2025
9.2.1 24 12/28/2025
9.2.0 31 12/20/2025
9.1.3 23 12/11/2025
9.1.2 29 12/13/2025
9.1.1 25 12/18/2025
9.1.0 24 12/20/2025
9.0.1 24 12/13/2025
9.0.0-preview5 26 12/23/2025
9.0.0-preview4 23 12/14/2025
9.0.0-preview3 28 12/18/2025
9.0.0-preview2 24 12/28/2025
9.0.0-preview1 23 12/28/2025
8.6.3 25 12/14/2025
8.6.2 19 12/25/2025
8.6.1 36 12/20/2025
8.6.0 32 12/15/2025
8.5.1 27 12/28/2025
8.5.0 31 12/14/2025
8.5.0-preview5 28 12/23/2025
8.5.0-preview4 23 12/13/2025
8.5.0-preview3 23 12/24/2025
8.5.0-preview2 26 12/18/2025
8.5.0-preview1 24 12/15/2025
8.4.0 30 12/16/2025
8.3.0 30 12/20/2025
8.2.3 20 12/20/2025
8.2.2 30 12/13/2025
8.2.1 28 12/20/2025
8.2.0 24 12/28/2025
8.1.3 26 12/20/2025
8.1.2 30 12/28/2025
8.1.1 25 12/28/2025
8.1.0 24 12/28/2025
8.1.0-preview2 25 12/28/2025
8.1.0-preview1 30 12/28/2025
8.0.101 34 12/14/2025
8.0.100 25 12/28/2025
8.0.0 20 12/13/2025
8.0.0-rc1 22 12/28/2025
8.0.0-preview4 24 12/22/2025
8.0.0-preview3 30 12/25/2025
8.0.0-preview2 25 12/28/2025
7.6.105 25 12/21/2025
7.6.104 31 12/24/2025
7.6.103 25 12/18/2025
7.6.102 25 12/15/2025
7.6.101 23 12/28/2025
7.6.100 25 12/13/2025
7.6.0 22 12/21/2025
7.6.0-preview1 29 12/14/2025
7.5.2 39 12/13/2025
7.5.1 22 12/20/2025
7.5.0 20 12/25/2025
7.4.0 26 01/03/2026
7.3.4 32 12/18/2025
7.3.3 25 12/28/2025
7.3.2 26 12/14/2025
7.3.1 22 12/15/2025
7.3.0 22 12/28/2025
7.3.0-beta3 25 12/28/2025
7.3.0-beta2 29 12/21/2025
7.3.0-beta1 27 12/28/2025
7.2.1 25 12/20/2025
7.2.0 34 12/28/2025
7.2.0-beta3 23 12/28/2025
7.2.0-beta2 28 12/28/2025
7.2.0-beta1 25 12/28/2025
7.1.1 25 12/15/2025
7.1.0 25 12/28/2025
7.1.0-beta1 26 12/18/2025
7.0.3 27 12/28/2025
7.0.2 22 12/28/2025
7.0.1 24 12/12/2025
7.0.0 25 12/14/2025
7.0.0-beta3 25 12/17/2025
7.0.0-beta2 28 12/24/2025
7.0.0-beta1 30 12/15/2025
6.4.1 23 12/20/2025
6.4.1-beta1 27 12/28/2025
6.4.0 32 12/18/2025
6.4.0-rc4 38 12/28/2025
6.4.0-rc3 25 12/28/2025
6.4.0-rc2 22 12/28/2025
6.4.0-rc1 31 12/28/2025
6.4.0-beta9 31 12/18/2025
6.4.0-beta8 27 12/28/2025
6.4.0-beta7 35 12/13/2025
6.4.0-beta6 31 12/13/2025
6.4.0-beta5 27 12/28/2025
6.4.0-beta4 32 12/28/2025
6.4.0-beta3 35 12/27/2025
6.4.0-beta2 32 12/28/2025
6.4.0-beta10 30 12/28/2025
6.4.0-beta1 32 12/13/2025
6.3.4-alpha 29 12/28/2025
6.3.3-alpha 32 12/23/2025
6.2.1 28 12/14/2025
6.2.1-beta1 25 12/28/2025
6.2.0 29 12/13/2025
6.2.0-beta1 27 12/28/2025
6.1.0 23 01/08/2026
6.0.2 29 12/14/2025
6.0.1 32 12/09/2025
6.0.0 27 12/14/2025
5.6.2 27 01/05/2026
5.6.1 23 12/14/2025
5.5.0 31 12/14/2025
5.4.0 25 01/12/2026
5.3.0 21 01/13/2026
5.2.0 31 12/14/2025
5.1.0 33 12/11/2025
5.0.0.1 19 12/28/2025
4.0.0.1 20 12/28/2025
4.0.0 27 12/10/2025
3.4.6 27 12/14/2025
3.4.0 32 12/14/2025
3.3.1 23 12/14/2025
3.2.0 32 12/14/2025
3.1.0 27 12/12/2025
3.0.0.1 30 12/12/2025
3.0.0 29 12/20/2025
2.0.0 31 12/29/2025
1.3.0 32 12/13/2025