Dev tools · alternatives · 2026

24 alternatives to Validatum – build fluent validation functions in .NET

An open-source library for building fluent validation functions for .NET. - bsheldrick/validatum

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Validatum – build fluent validation functions in .NET launched in 2021; newer entries below may have overtaken it.

1. 1
   a small jQuery Form Validation library▲47

   Got bored of using other ones, so made my own. Contribute to jackfranklin/jQuery-Form-Validator development by creating an account on GitHub.

   2012 · github.com · its alternatives →

2. 2
   Fluent Validation in .NET Core▲6

   Fluent Validation in .NET Core

   2024 · its alternatives →

3. 3
   Lint for HTTP▲138

   Validator for HTTP. Contribute to vfaronov/httpolice development by creating an account on GitHub.

   2016 · github.com · its alternatives →

4. 4
   Form-validation.js – JavaScript form validation library▲29

   The most customizable validation framework for JavaScript. - soc221b/form-validation.js

   2020 · github.com · its alternatives →

5. 5V1
   Validr-1.2 – Fastest Python validation library plus powerful features▲8

   A simple, fast, extensible python library for data validation. New features: * union validator * dynamic dict validator * timedelta validator * enum validator * slug validator * fqdn validator * nested model class GitHub: https://github.com/guyskk/validr Document: https://github.com/guyskk/validr/wiki Usage: https://github.com/guyskk/validr/wiki/Scenario-&-Example

   2020 · its alternatives →

6. 6
   A new validation library for JavaScript (React, Backbone integration)▲8

   Validation library based on type combinators. Contribute to gcanti/tcomb-validation development by creating an account on GitHub.

   2014 · github.com · its alternatives →

7. 7
   ValidKube – Validate, Clean and Secure Your K8s YAML▲23

   ValidKube combines the best open-source tools to help ensure Kubernetes YAML best practices, hygiene & security.

   2022 · validkube.com · its alternatives →

8. 8
   Deep Type - validate JavaScript objects and arrays using GraphQL▲8

   Validate JS objects and arrays using graphql-esque syntax - bsteephenson/Deep-Type

   2015 · github.com · its alternatives →

9. 9
   Koda Validate – Typesafe, combinable validation for Python▲30

   Typesafe, Composable Validation. Contribute to keithasaurus/koda-validate development by creating an account on GitHub.

   2022 · github.com · its alternatives →

10. 10
    Structured data validator▲11

    A full-featured schema.org rich cards validation tool

    2020 · redirection.io · its alternatives →

11. 11
    CSV Schema and Validator▲8

    CSV Validation Tool and API (CSV Schema RI). Contribute to digital-preservation/csv-validator development by creating an account on GitHub.

    2018 · github.com · its alternatives →

12. 12
    Piou – Build beautiful command-line interfaces with type validation▲27

    A CLI tool to build beautiful rich text command-line interfaces with type validation. - Andarius/piou

    2021 · github.com · its alternatives →

13. 13
    Validater – a python tool to validate data by schema▲5

    A simple, fast, extensible python library for data validation. - guyskk/validr

    2016 · github.com · its alternatives →

14. 14AC
    A C# library to help you enforce a Given-When-Then structured Unit test▲24

    I always strive to write better, clean and readable code. But I often find unit tests are hard to read, and especially harder to quickly identify what are the important pieces, or even what the test is testing about. So I came up with this lightweight library to help enforce unit tests with a Given-When-Then structure. I hope you find this useful. Any feedback are welcome. https://github.com/cobrakai-lab/Cobrakai.GWTUnit

    2021 · its alternatives →

15. 15
    Why an Open Source JSON-LD Database▲16

    We are pleased to launch a public preview of an open source JSON-LD database which combines the simplicity of a document db with the analytical power of semantic graph. We hope it is approachable for most any developer while having the capabilities, when needed, for data interoperability, embedded cell-level security (ReBAC style), rich shape/schema restrictions, data provenance (time travel), and fact inferencing. Why did our team at Fluree build this? Data is increasingly critical for great decision making, AI, and more. The way we typically store and manage data, mainly as an…

    2023 · flur.ee · its alternatives →

16. 16MF
    My first open source project (micro check library)▲13

    Check types, regexps, presence, time and more...

    2015 · arasatasaygin.github.io · its alternatives →

17. 17
    Valid8r, Functional validation for Python CLIs using Maybe monads▲6

    I built Valid8r because I got tired of writing the same input validation code for every CLI tool. You know the pattern: parse a string, check if it's valid, print an error if not, ask again. Repeat for every argument. The library uses Maybe monads (Success/Failure instead of exceptions) so you can chain parsers and validators: # Try it: pip install valid8r from valid8r.core import parsers, validators # Parse and validate in one pipeline result = ( parsers.parse_int(user_input) .bind(validators.minimum(1)) .bind(validators.maximum(65535)) ) match result: case Success(port): print(f"Using…

    Nov 2025 · github.com · its alternatives →

18. 18
    Schema Validator▲6

    Free json-ld & schema.org validator tool

    Nov 2025 · schemavalidator.com · its alternatives →

19. 19VJ
    Valib.js - validation library for the browser and Node.js▲7

    2014 · sideralis.org · its alternatives →

20. 20
    deno_validate▲3

    A simple validation library for Deno

    2022 · deno.land · its alternatives →

21. 21
    I built an open-source alternative to TypeForm [MIT]▲7

    An open-source, headless, API-first platform that empowers developers and product teams to create and optimize custom in-app user flows, such as new user onboarding wizards. Tutim library supports multi-step forms, conditional branching, custom validation, l10n, and more – all through a JSON schema and unlimited flexibility through code. Beta release on GitHub (star us!): https://github.com/tutim-io/tutim. Why it's better than other form builders or open-source libraries? - Flexible: Seamlessly integrate Tutim with your design system components, APIs, and your backend. -…

    2023 · github.com · its alternatives →

22. 22
    Extend built-in Python collections with LINQ-for-objects style methods▲15

    ⚡🐍 Extends built-in Python collections with LINQ-style methods - borzunov/dontasq

    2015 · github.com · its alternatives →

23. 23
    FormML – A DSL for building complex web forms▲5

    Hi everyone! I wrote a DSL (named Form Modeling Language) for modeling & building complex forms and am glad to share it with you now. Over the years, I’ve encountered many challenges while building complex forms from scratch—challenges that I believe are common, difficult, and yet often overlooked. These include managing interdependent fields, handling intricate validation rules, and maintain good collaboration between technical and non-technical people. FormML is my attempt to address these pain points. The project's README goes into more detail, but in short, FormML offers a model-first…

    2024 · github.com · its alternatives →

24. 24
    Validate-asm – an asm.js validator/ linter for high performance JS▲6

    :skull: [MERGED UPSTREAM] Like JSLint, but for asm.js - alexanderGugel/validate-asm

    2015 · github.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →