FluentValidation Files

.NET validation library for building strongly-typed validation rules

This is an exact mirror of the FluentValidation project, hosted at https://github.com/FluentValidation/FluentValidation. SourceForge is not affiliated with FluentValidation.

The interactive file manager requires Javascript. Please enable it or use sftp or scp.
You may still browse the files here.

Name	Modified	Size	InfoDownloads / Week
Parent folder
12.2.0 source code.tar.gz	2026-10-10	335.5 kB	0
12.2.0 source code.zip	2026-10-10	568.4 kB	0
README.md	2026-10-10	1.5 kB	0
Totals: 3 Items		905.4 kB	0

Release notes

Please read the upgrade guide if you are moving from 11.x to 12.x

Changes in 12.2.0

Add Lithuanian language (#2350)
Add Belarusian language (#2356)
Add GetParentChain() to PropertyChain (#2358)
Fix ArgumentNullException in TestValidationResult when a failure has a null PropertyName (#2362)
Reject an inverted range when the comparer returns a negative other than -1 in RangeValidator (#2370)
Change EnumValidator to work under native AOT (#2371)
Fix PropertyChain.IsChildChainOf for sibling chains that share a name prefix (#2372)
Fix PropertyPath is incorrect in .When() on RuleForEach (#2363)

Changes in 12.1.0

Add Tamil language (#2334)
Add Telugu language (#2333)
Fixes to Japanese translations (#2340)

Changes in 12.0.0

Drops support for netstandard2.0, netstandard2.1, .net 5, .net 6 and .net 7. Minimum supported platform is now .net 8.
Add support for dependent rules for custom rules (#2170)
Removes deprecated DI extensions
Removes deprecated transform methods (#2027)
Remove the ability to disable the root-model null check (#2069)
Use Zomp.SyncMethodGenerator to clean up internal sync/async code paths and increase performance (#2136)
Add Serbian (Cyrillic) language; rename existing Serbian to Serbian (Latin) (#2283)

Downloads

Binaries can be downloaded from nuget:

FluentValidation - Main package

Source: README.md, updated 2026-10-10

Other Useful Business Software

Paessler: Easy to Use With Enterprise Power. Free Trial Icon

Paessler: Easy to Use With Enterprise Power. Free Trial

A low-code dashboard makes monitoring intuitive for any admin, while scripting and custom sensors give experts full control.

You shouldn't have to choose between a monitoring tool that's easy to use and one that's powerful enough for a complex environment. PRTG's low-code interface lets any admin build dashboards, set alerts and monitor devices without scripting, while custom sensors and full API access are there when your team needs deeper control. One platform, no compromise. Download a free 30-day trial now.

Get Free Download

MongoDB Atlas runs apps anywhere Icon

MongoDB Atlas runs apps anywhere

Deploy in 115+ regions with the modern database for every enterprise.

MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.

Start Free

Build Agents and Models on One Platform

Everything you need to build production-ready agents and models. Access 200+ Google and third-party AI models and tools.

Gemini Enterprise Agent Platform is Google Cloud's comprehensive platform for developers to build, scale, govern, and optimize agents and models. Choose from Google's most advanced models and third-party models like Anthropic's Claude Model Family.

Start Free

Recommended Projects

Validation Library
Validation library for node.js
Symfony Validator
Provides tools to validate values
bootstrap-validate
A simple Form Validation Utility for Bootstrap 3, Bootstrap 4
cri-tools
CLI and validation tools for Kubelet Container Runtime Interface (CRI)
jQuery Validation Plugin
jQuery Validation Plugin library sources