FluentValidation 9.3.0-preview1
Prefix ReservedSee the version list below for details.
dotnet add package FluentValidation --version 9.3.0-preview1
NuGet\Install-Package FluentValidation -Version 9.3.0-preview1
<PackageReference Include="FluentValidation" Version="9.3.0-preview1" />
<PackageVersion Include="FluentValidation" Version="9.3.0-preview1" />
<PackageReference Include="FluentValidation" />
paket add FluentValidation --version 9.3.0-preview1
#r "nuget: FluentValidation, 9.3.0-preview1"
#:package FluentValidation@9.3.0-preview1
#addin nuget:?package=FluentValidation&version=9.3.0-preview1&prerelease
#tool nuget:?package=FluentValidation&version=9.3.0-preview1&prerelease
A validation library for .NET that uses a fluent interface to construct strongly-typed validation rules.
| Product | Versions Compatible and additional computed target framework versions. | 
|---|---|
| .NET | net5.0 was computed. net5.0-windows was computed. net6.0 was computed. net6.0-android was computed. net6.0-ios was computed. net6.0-maccatalyst was computed. net6.0-macos was computed. net6.0-tvos was computed. net6.0-windows was computed. net7.0 was computed. net7.0-android was computed. net7.0-ios was computed. net7.0-maccatalyst was computed. net7.0-macos was computed. net7.0-tvos was computed. net7.0-windows was computed. net8.0 was computed. net8.0-android was computed. net8.0-browser was computed. net8.0-ios was computed. net8.0-maccatalyst was computed. net8.0-macos was computed. net8.0-tvos was computed. net8.0-windows was computed. net9.0 was computed. net9.0-android was computed. net9.0-browser was computed. net9.0-ios was computed. net9.0-maccatalyst was computed. net9.0-macos was computed. net9.0-tvos was computed. net9.0-windows was computed. net10.0 was computed. net10.0-android was computed. net10.0-browser was computed. net10.0-ios was computed. net10.0-maccatalyst was computed. net10.0-macos was computed. net10.0-tvos was computed. net10.0-windows was computed. | 
| .NET Core | netcoreapp2.0 was computed. netcoreapp2.1 was computed. netcoreapp2.2 was computed. netcoreapp3.0 was computed. netcoreapp3.1 was computed. | 
| .NET Standard | netstandard2.0 is compatible. netstandard2.1 was computed. | 
| .NET Framework | net461 is compatible. net462 was computed. net463 was computed. net47 was computed. net471 was computed. net472 was computed. net48 was computed. net481 was computed. | 
| MonoAndroid | monoandroid was computed. | 
| MonoMac | monomac was computed. | 
| MonoTouch | monotouch was computed. | 
| Tizen | tizen40 was computed. tizen60 was computed. | 
| Xamarin.iOS | xamarinios was computed. | 
| Xamarin.Mac | xamarinmac was computed. | 
| Xamarin.TVOS | xamarintvos was computed. | 
| Xamarin.WatchOS | xamarinwatchos was computed. | 
- 
                                                    .NETFramework 4.6.1- No dependencies.
 
- 
                                                    .NETStandard 2.0- No dependencies.
 
NuGet packages (2.8K)
Showing the top 5 NuGet packages that depend on FluentValidation:
| Package | Downloads | 
|---|---|
| FluentValidation.DependencyInjectionExtensions Dependency injection extensions for FluentValidation | |
| FluentValidation.AspNetCore AspNetCore integration for FluentValidation | |
| Ocelot Ocelot is an API gateway based on .NET stack. | |
| Reo.Core.Validation Package Description | |
| Reo.Core.DataModels Package Description | 
GitHub repositories (253)
Showing the top 20 popular GitHub repositories that depend on FluentValidation:
| Repository | Stars | 
|---|---|
| ardalis/CleanArchitecture 
                                                            Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 9
                                                         | |
| abpframework/abp 
                                                            Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with best practices on top of the .NET. Provides the fundamental infrastructure, cross-cutting-concern implementations, startup templates, application modules, UI themes, tooling and documentation.
                                                         | |
| kgrzybek/modular-monolith-with-ddd 
                                                            Full Modular Monolith application with Domain-Driven Design approach.
                                                         | |
| Sonarr/Sonarr 
                                                            Smart PVR for newsgroup and bittorrent users.
                                                         | |
| Radarr/Radarr 
                                                            Movie organizer/manager for usenet and torrent users.
                                                         | |
| aspnetboilerplate/aspnetboilerplate 
                                                            ASP.NET Boilerplate - Web Application Framework
                                                         | |
| dotnet-architecture/eShopOnWeb 
                                                            Sample ASP.NET Core 8.0 reference application, now community supported: https://github.com/NimblePros/eShopOnWeb
                                                         | |
| MudBlazor/MudBlazor 
                                                            Blazor Component Library based on Material Design principles with an emphasis on ease of use and extensibility
                                                         | |
| ThreeMammals/Ocelot 
                                                            .NET API Gateway
                                                         | |
| NancyFx/Nancy 
                                                            Lightweight, low-ceremony, framework for building HTTP based services on .Net and Mono
                                                         | |
| EduardoPires/EquinoxProject 
                                                            Web Application ASP.NET 9 using Clean Architecture, DDD, CQRS, Event Sourcing and a lot of good practices
                                                         | |
| canton7/SyncTrayzor 
                                                            Windows tray utility / filesystem watcher / launcher for Syncthing
                                                         | |
| FastEndpoints/FastEndpoints 
                                                            A light-weight REST API development framework for ASP.NET 8 and newer.
                                                         | |
| Prowlarr/Prowlarr 
                                                            Prowlarr is an indexer manager/proxy built on the popular *arr .net/reactjs base stack to integrate with your various PVR apps, supporting management of both Torrent Trackers and Usenet Indexers.
                                                         | |
| jasontaylordev/NorthwindTraders 
                                                            Northwind Traders is a sample application built using ASP.NET Core and Entity Framework Core.
                                                         | |
| Lidarr/Lidarr 
                                                            Looks and smells like Sonarr but made for music.
                                                         | |
| microsoft/RulesEngine 
                                                            A fast and reliable .NET Rules Engine with extensive Dynamic expression support
                                                         | |
| fullstackhero/blazor-starter-kit 
                                                            Clean Architecture Template for Blazor WebAssembly Built with MudBlazor Components.
                                                         | |
| Megabit/Blazorise 
                                                            Blazorise is a component library built on top of Blazor with support for CSS frameworks like Bootstrap, Tailwind, Bulma, AntDesign, and Material.
                                                         | |
| Readarr/Readarr 
                                                            Book Manager and Automation (Sonarr for Ebooks)
                                                         | 
| Version | Downloads | Last Updated | 
|---|---|---|
| 12.0.0 | 16,070,888 | 5/5/2025 | 
| 12.0.0-preview1 | 238,083 | 1/2/2025 | 
| 11.11.0 | 45,008,100 | 11/16/2024 | 
| 11.10.0 | 20,242,938 | 9/15/2024 | 
| 11.9.2 | 26,998,210 | 6/10/2024 | 
| 11.9.1 | 13,848,948 | 4/23/2024 | 
| 11.9.0 | 33,651,897 | 12/21/2023 | 
| 11.8.1 | 9,718,570 | 11/22/2023 | 
| 11.8.0 | 9,870,561 | 10/19/2023 | 
| 11.7.1 | 12,035,641 | 8/12/2023 | 
| 11.7.0 | 140,972 | 8/11/2023 | 
| 11.6.0 | 9,165,104 | 7/4/2023 | 
| 11.5.2 | 20,161,859 | 4/7/2023 | 
| 11.5.1 | 66,960,208 | 2/20/2023 | 
| 11.5.0 | 3,146,859 | 2/13/2023 | 
| 11.4.0 | 20,102,644 | 11/23/2022 | 
| 11.3.0 | 3,758,917 | 11/10/2022 | 
| 11.2.2 | 17,126,588 | 9/11/2022 | 
| 11.2.1 | 23,886,564 | 8/28/2022 | 
| 11.2.0 | 7,866,881 | 8/8/2022 | 
| 11.1.1 | 680,630 | 8/6/2022 | 
| 11.1.0 | 13,615,612 | 6/22/2022 | 
| 11.0.3 | 3,696,339 | 6/10/2022 | 
| 11.0.2 | 5,626,365 | 5/27/2022 | 
| 11.0.1 | 6,950,392 | 5/7/2022 | 
| 11.0.0 | 6,930,890 | 4/30/2022 | 
| 10.4.0 | 21,472,999 | 3/11/2022 | 
| 10.3.6 | 27,990,950 | 12/13/2021 | 
| 10.3.5 | 3,297,484 | 11/30/2021 | 
| 10.3.4 | 10,545,809 | 10/22/2021 | 
| 10.3.3 | 12,446,649 | 8/24/2021 | 
| 10.3.1 | 751,639 | 8/19/2021 | 
| 10.3.0 | 8,697,517 | 7/9/2021 | 
| 10.2.3 | 8,718,437 | 6/3/2021 | 
| 10.2.2 | 475,548 | 6/1/2021 | 
| 10.2.1 | 1,391,829 | 5/30/2021 | 
| 10.2.0 | 393,768 | 5/28/2021 | 
| 10.1.0 | 5,608,826 | 4/28/2021 | 
| 10.0.4 | 4,382,284 | 4/17/2021 | 
| 9.5.4 | 7,499,492 | 4/5/2021 | 
| 9.5.3 | 4,136,113 | 3/15/2021 | 
| 9.5.2 | 2,059,262 | 3/8/2021 | 
| 9.5.1 | 6,906,495 | 2/11/2021 | 
| 9.5.0 | 3,480,224 | 1/31/2021 | 
| 9.4.0 | 3,159,395 | 1/14/2021 | 
| 9.3.0 | 15,225,570 | 11/10/2020 | 
| 9.3.0-preview3 | 40,058 | 10/19/2020 | 
| 9.3.0-preview2 | 154,147 | 9/15/2020 | 
| 9.3.0-preview1 | 13,626 | 8/26/2020 | 
| 9.2.2 | 7,293,779 | 9/20/2020 | 
| 9.2.1 | 33,428 | 9/19/2020 | 
| 9.2.0 | 8,101,463 | 8/26/2020 | 
| 9.1.3 | 1,045,881 | 8/19/2020 | 
| 9.1.2 | 987,858 | 8/12/2020 | 
| 9.1.1 | 686,151 | 8/8/2020 | 
| 9.1.0 | 313,276 | 8/8/2020 | 
| 9.0.1 | 5,680,120 | 7/14/2020 | 
| 9.0.0-preview5 | 90,508 | 5/23/2020 | 
| 9.0.0-preview4 | 147,476 | 4/22/2020 | 
| 9.0.0-preview3 | 208,117 | 2/29/2020 | 
| 9.0.0-preview2 | 32,690 | 2/21/2020 | 
| 9.0.0-preview1 | 101,044 | 2/8/2020 | 
| 8.6.3 | 7,907,768 | 8/28/2020 | 
| 8.6.2 | 29,422,319 | 2/29/2020 | 
| 8.6.1 | 13,290,261 | 12/28/2019 | 
| 8.6.0 | 4,400,583 | 12/4/2019 | 
| 8.5.1 | 3,940,675 | 11/2/2019 | 
| 8.5.0 | 6,718,330 | 9/24/2019 | 
| 8.5.0-preview5 | 70,831 | 9/1/2019 | 
| 8.5.0-preview4 | 102,915 | 7/23/2019 | 
| 8.5.0-preview3 | 32,628 | 7/10/2019 | 
| 8.5.0-preview2 | 89,209 | 6/13/2019 | 
| 8.5.0-preview1 | 64,266 | 5/10/2019 | 
| 8.4.0 | 15,023,302 | 5/10/2019 | 
| 8.3.0 | 4,203,648 | 4/24/2019 | 
| 8.2.3 | 739,323 | 4/12/2019 | 
| 8.2.2 | 1,138,597 | 4/5/2019 | 
| 8.2.1 | 505,215 | 4/4/2019 | 
| 8.2.0 | 1,104,138 | 3/26/2019 | 
| 8.1.3 | 5,237,939 | 1/25/2019 | 
| 8.1.2 | 2,408,072 | 12/18/2018 | 
| 8.1.1 | 619,394 | 12/11/2018 | 
| 8.1.0 | 850,183 | 12/6/2018 | 
| 8.1.0-preview2 | 29,891 | 11/14/2018 | 
| 8.1.0-preview1 | 28,206 | 10/14/2018 | 
| 8.0.101 | 960,593 | 11/24/2018 | 
| 8.0.100 | 4,157,253 | 9/4/2018 | 
| 8.0.0 | 1,172,794 | 8/16/2018 | 
| 8.0.0-rc1 | 54,505 | 7/24/2018 | 
| 8.0.0-preview4 | 26,109 | 7/16/2018 | 
| 8.0.0-preview3 | 24,708 | 7/13/2018 | 
| 8.0.0-preview2 | 24,561 | 7/13/2018 | 
| 7.6.105 | 1,876,817 | 8/11/2018 | 
| 7.6.104 | 2,833,378 | 7/6/2018 | 
| 7.6.103 | 1,328,305 | 6/16/2018 | 
| 7.6.102 | 344,062 | 6/14/2018 | 
| 7.6.101 | 78,028 | 6/13/2018 | 
| 7.6.100 | 181,272 | 6/7/2018 | 
| 7.6.0 | 411,425 | 6/1/2018 | 
| 7.6.0-preview1 | 52,867 | 4/12/2018 | 
| 7.5.2 | 4,003,593 | 3/16/2018 | 
| 7.5.1 | 282,463 | 3/11/2018 | 
| 7.5.0 | 756,551 | 2/26/2018 | 
| 7.4.0 | 2,379,144 | 1/26/2018 | 
| 7.3.4 | 1,140,054 | 1/2/2018 | 
| 7.3.3 | 199,399 | 12/22/2017 | 
| 7.3.2 | 76,885 | 12/21/2017 | 
| 7.3.1 | 349,626 | 12/13/2017 | 
| 7.3.0 | 127,672 | 12/13/2017 | 
| 7.3.0-beta3 | 28,575 | 12/8/2017 | 
| 7.3.0-beta2 | 47,593 | 11/20/2017 | 
| 7.3.0-beta1 | 25,414 | 11/11/2017 | 
| 7.2.1 | 2,963,578 | 10/24/2017 | 
| 7.2.0 | 851,785 | 10/5/2017 | 
| 7.2.0-beta3 | 41,863 | 9/5/2017 | 
| 7.2.0-beta2 | 27,676 | 8/22/2017 | 
| 7.2.0-beta1 | 23,883 | 8/19/2017 | 
| 7.1.1 | 2,400,111 | 7/25/2017 | 
| 7.1.0 | 564,590 | 6/28/2017 | 
| 7.1.0-beta1 | 23,658 | 6/24/2017 | 
| 7.0.3 | 764,967 | 6/7/2017 | 
| 7.0.2 | 291,817 | 5/26/2017 | 
| 7.0.1 | 98,576 | 5/23/2017 | 
| 7.0.0 | 756,364 | 5/19/2017 | 
| 7.0.0-beta3 | 66,088 | 5/1/2017 | 
| 7.0.0-beta2 | 27,331 | 4/17/2017 | 
| 7.0.0-beta1 | 24,929 | 4/7/2017 | 
| 6.4.1 | 2,213,128 | 3/15/2017 | 
| 6.4.1-beta1 | 23,946 | 3/13/2017 | 
| 6.4.0 | 1,072,135 | 3/3/2017 | 
| 6.4.0-rc4 | 146,723 | 2/13/2017 | 
| 6.4.0-rc3 | 39,898 | 2/3/2017 | 
| 6.4.0-rc2 | 39,956 | 1/30/2017 | 
| 6.4.0-rc1 | 23,755 | 1/30/2017 | 
| 6.4.0-beta9 | 91,782 | 11/21/2016 | 
| 6.4.0-beta8 | 50,758 | 10/31/2016 | 
| 6.4.0-beta7 | 24,397 | 10/28/2016 | 
| 6.4.0-beta6 | 24,697 | 10/25/2016 | 
| 6.4.0-beta5 | 24,271 | 10/24/2016 | 
| 6.4.0-beta4 | 24,372 | 10/21/2016 | 
| 6.4.0-beta3 | 71,729 | 7/4/2016 | 
| 6.4.0-beta2 | 25,270 | 7/1/2016 | 
| 6.4.0-beta10 | 23,466 | 1/30/2017 | 
| 6.4.0-beta1 | 28,665 | 6/28/2016 | 
| 6.3.4-alpha | 434,002 | 6/1/2016 | 
| 6.3.3-alpha | 23,260 | 5/27/2016 | 
| 6.2.1 | 5,538,820 | 2/26/2016 | 
| 6.2.1-beta1 | 28,738 | 2/24/2016 | 
| 6.2.0 | 172,496 | 2/22/2016 | 
| 6.2.0-beta1 | 24,591 | 2/12/2016 | 
| 6.1.0 | 439,934 | 1/18/2016 | 
| 6.0.2 | 118,089 | 1/5/2016 | 
| 6.0.1 | 40,191 | 1/5/2016 | 
| 6.0.0 | 135,621 | 12/22/2015 | 
| 5.6.2 | 1,635,627 | 5/29/2015 | 
| 5.6.1 | 34,988 | 5/29/2015 | 
| 5.5.0 | 1,227,458 | 10/31/2014 | 
| 5.4.0 | 613,616 | 7/3/2014 | 
| 5.3.0 | 105,887 | 5/27/2014 | 
| 5.2.0 | 77,055 | 5/21/2014 | 
| 5.1.0 | 1,072,785 | 3/11/2014 | 
| 5.0.0.1 | 563,077 | 10/24/2013 | 
| 4.0.0.1 | 307,840 | 7/18/2013 | 
| 4.0.0 | 121,021 | 4/29/2013 | 
| 3.4.6 | 430,180 | 8/30/2012 | 
| 3.4.0 | 72,284 | 8/17/2012 | 
| 3.3.1 | 93,713 | 3/30/2012 | 
| 3.2.0 | 78,518 | 11/14/2011 | 
| 3.1.0 | 53,253 | 7/30/2011 | 
| 3.0.0.1 | 26,526 | 7/5/2011 | 
| 3.0.0 | 47,479 | 6/25/2011 | 
| 2.0.0 | 77,873 | 1/9/2011 | 
| 1.3.0 | 435,586 | 1/7/2011 | 
FluentValidation 9 is a major release. Please read the upgrade notes at https://docs.fluentvalidation.net/en/latest/upgrading-to-9.html
Changes in 9.3.0
* Support for .NET 5
Changes in 9.2.0:
* Add inheritance validator
* Performance improvements
Changes in 9.1.3:
* Fix an issue with IncludeRulesNotInRuleSet not working correctly
Changes in 9.1.2:
* Make the ValidationContext.ThrowOnFailures getter public.
Changes in 9.1.1:
* Fix an incorrect deprecation message.
Changes in 9.1:
* Make ruleset separator character splitting consistent
* Transform now works with RuleForEach
* Introduce constants for rulesets
* Resolve issue when attempting to use asynchronous conditions in a synchornous validaiton run
* Added asynchronous versions of the TestHelper methods.
* Introduce CascadeMode.Stop and deprecate CascadeMode.StopOnFirstFailure to resolve confusion/abiguity about setting the cascade mode at validator-level (#1437)
* RaiseValidationException can be overridden to customize the exception throwing process
* Add new Validate extension methods that allow options to be configured using a strategy
Changes in 9.0.0:
* Removed support for netstandard1.1 and netstandard1.6
* Removed support for end-of-life .NET Core versions (2.2 and 3.0). LTS versions are supported (2.1 and 3.1)
* Default email validation mode now uses the same logic as ASP.NET Core. Previous regex behaviour is opt-in.
* TestHelper advanced mode now has more features (see https://docs.fluentvalidation.net/en/latest/testing.html#advanced-test-extensions)
* Equal/NotEqual now perform ordinal comparison when used with string properties
* Severity can now be set dynamically with a callback
* Removed WithLocalizedMessage (WithMessage that takes a callback is the replacement)
* Removed ResourceName from ValidationFailure
* Removed ResourceName and ResourceType from IStringSource.
* Removed SetCollectionValidator which was deprecated in 8.0
* Additional overload of OnAnyFailure that can receive a collection of validation failures
* Remove DisplayAttribute integration and reference to DataAnnotations.
* ComparisonProperty placeholder is now formatted like PropertyName
* Translations of default error messages into other languages are now lazily-loaded
* Added Slovenian translations of default error messages.
* Added Icelandic translations of default error messages.
* Added WithMessageArgument to the test helpers.
* Add additional overload of SetValidator that takes a Func that receives the current property value.
* ASP.NET Core: FluentValidationModelValidatorProvider and FluentValidationModelValidator are now public.
* Work around a bug in ASP.NET Core's integration testing components that can cause ConfigureServices to run multiple times.
* SourceLink integration.
* {CollectionIndex} placeholder can now be accessed in child validators.
* Additional ValidationException constructor that allows using both the default message and a custom one together.
* ScalePrecisionValidator algorithm now matches SQL Server.
* Additional overload of the When methods that contain the validation context.
* Automatically scanned types can be excluded when calling RegisterValidatorsFromAssemblyContaining in ASP.NET Core projects.
* New AutomaticValidationEnabled property for use in ASP.NET Core projects (defaults to true).
Full release notes can be found at https://github.com/FluentValidation/FluentValidation/blob/master/Changelog.txt