Dev tools · alternatives · 2026

24 alternatives to File Validator

first Python validation library to validate files using mime

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. File Validator launched in 2022; newer entries below may have overtaken it.

1. 1
   Validator▲345

   Research and validate you micro saas ideas fast as Cheetah

   2024 · validator.help · its alternatives →

2. 2IA
   I am building a new Python library to read/write PDF files▲279

   Hi HN! This is my pet project, written from scratch because there is so much to discover and learn in the process. The focus is on simplicity and incremental updates. Progress is slow because I do not have much spare time to work on this, but I would love to hear some feedback. Regards

   2022 · github.com · its alternatives →

3. 3CF
   Config-file-validator – CLI tool to validate all your config files▲33

   2023 · github.com · its alternatives →

4. 4AQ
   A quality checker for Python wheels▲42

   2020 · github.com · its alternatives →

5. 5
   MIFieldValidator▲9

   Simplest way to use custom field validator

   2019 · its alternatives →

6. 6KV
   Koda Validate – Typesafe, combinable validation for Python▲30

   2022 · github.com · its alternatives →

7. 7V1
   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 →

8. 8
   octaValidate▲69

   A client-side form validation library

   2022 · its alternatives →

9. 9VJ
   validate.js - lightweight JavaScript form validation library▲102

   2011 · rickharrison.github.com · its alternatives →

10. 10
    Validatorapp▲120

    Idea and MVP validation software

    2020 · its alternatives →

11. 11FF
    FizzBee – Formal methods in Python▲119

    GitHub: https://www.github.com/fizzbee-io/FizzBee Traditionally, formal methods are used only for highly mission critical systems to validate the software will work as expected before it's built. Recently, every major cloud vendor like AWS, Azure, Mongo DB, confluent, elastic and so on use formal methods to validate their design like the replication algorithm or various protocols doesn't have a design bug. I used TLA+ for billing and usage based metering applications. However, the current formal methods solutions like TLA+, Alloy or P and so on are incredibly complex to…

    2024 · fizzbee.io · its alternatives →

12. 12VF
    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 →

13. 13
    REST Data Validator▲3

    Library designed to offer comprehensive data validations

    2024 · rest-data-validator.netlify.app · its alternatives →

14. 14FV
    Form-validation.js – JavaScript form validation library▲29

    2020 · github.com · its alternatives →

15. 15
    Octavalidate▲61

    A client-side and server-side form validation library

    2022 · its alternatives →

16. 16
    Rust based eBook library for Python, with MIT license▲33

    fast, rust based epub library for python. Contribute to arc53/fast-ebook development by creating an account on GitHub.

    Apr 2026 · github.com · its alternatives →

17. 17
    Mailerio▲30

    Keep your lists clean with email validation tool

    2025 · mailerio.com · its alternatives →

18. 18
    Emails_Validator▲6

    Accurate, affordable and secure emails verification service

    Jan 2026 · emailsvalidator.in · its alternatives →

19. 19
    Robots.txt Validator and Testing Tool▲12

    Fetch and analyze any website's robots.txt file in real-time

    Oct 2025 · digitalmansoor.com · its alternatives →

20. 20
    Weemple Video Station Validator▲3

    Tool to validate the metadata of Synology Video Station.

    2021 · its alternatives →

21. 21
    Image Validator▲29

    Free diagnostic web tool for your product images

    2022 · its alternatives →

22. 22AP
    A Python Libary That Simplifies Data Validation▲8

    2021 · github.com · its alternatives →

23. 23
    Robots.txt Validator & Testing Tool▲6

    Validate robots.txt rules before you publish

    Jul 2026 · loganmosby.com · its alternatives →

24. 24
    deno_validate▲3

    A simple validation library for Deno

    2022 · 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 →