FluentValidation/FluentValidation
A popular .NET validation library for building strongly-typed validation rules. observed · 2026-08-28
Health v2 · maintenance only
74/100
- Activity 97
- Release rhythm 31
- Longevity 100
Flags: no_readme
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 169
- age_days: 6100
- days_rel: 303
- days_push: 21
- n_releases_24m: 4
Adoption not part of the score
9752 stars · 1275 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
FluentValidation is a popular .NET library for building strongly-typed validation rules with a fluent interface. It lets developers define reusable, testable validation logic for models in C# applications.
Use cases
- validate request models in ASP.NET Core APIs
- build reusable business rule validation in C#
- replace data annotations with fluent validation rules
- validate DTOs before persistence
- write unit-testable validation logic
- integrate validation into MediatR pipelines
When to choose
- you're on .NET and need complex, strongly-typed validation rules
- you want validation logic that is easy to unit test and reuse
- data annotations are too limited for your business rules
When to avoid
- you only need simple required-field checks that data annotations cover
- you're not working in the .NET ecosystem
Facets
library · maturity stable
form-handling middleware developer-tools web-development backend dotnet cross-platform validation fluent-api csharp strongly-typed
1 source
- homepage: https://fluentvalidation.net · fetched 2026-08-29 · 7c1baea551c0
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| FluentValidation/FluentValidation | main | 74 |
For agents
markdown · JSON · MCP: product_card(name="FluentValidation/FluentValidation")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem