28 best Python Form Validation libraries in 2023
by weaver 
Updated: Sep 1, 2021
Guide Kit
Python is an indispensable tool for many programmers. With it, you can do away with all the repetitive and tedious work involved with other scripting languages. For a technical process like form validation, with Python, you can ensure that the input text is in the correct format (including both after submitting and inline validation). Hence, when you build an application that accepts user input, you can verify that the data that enters your application is valid, consistent, and secure with various open-source Python libraries. Here we list down some of those libraries which are useful for form validation. Say, with pydantic, you can define custom data types, parse input data, and then validate it. Using type hints, the library can even coerce input data to the declared types and accumulate errors using ValidationError. pydantic is also easily discoverable given how well it has been documented. Another application, Django-crispy-forms helps you manage Django forms by allowing you to adjust their properties (say, CSS classes, send button, etc.) on the backend. This means you no longer have to rewrite anything in the template. We also have Formspree, which is a backend, API, and email service for HTML and JavaScript forms. It is secure with a honeypot to prevent spam and is the simplest way to embed customized order forms, “Contact Us” forms, and dialogue boxes meant to capture email.
pydanticby samuelcolvin
9557 Version:v1.9.0Data parsing and validation using Python type hints
pydanticby samuelcolvin
Python 9557 Version:v1.9.0 License: Permissive (MIT)
marshmallowby marshmallow-code
6558 Version:CurrentA lightweight library for converting complex objects to and from simple Python datatypes.
marshmallowby marshmallow-code
Python 6558 Version:Current License: Permissive (MIT)
django-crispy-formsby django-crispy-forms
4718 Version:2.0The best way to have DRY Django forms. The app provides a tag and filter that lets you quickly render forms in a div format while providing an enormous amount of capability to configure and control the rendered HTML.
django-crispy-formsby django-crispy-forms
Python 4718 Version:2.0 License: Permissive (MIT)
connexionby zalando
3888 Version:2.10.0Swagger/OpenAPI First framework for Python on top of Flask with automatic endpoint validation & OAuth2 support
connexionby zalando
Python 3888 Version:2.10.0 License: Others (Non-SPDX)
sqlparseby andialbrecht
3291 Version:CurrentA non-validating SQL parser module for Python
sqlparseby andialbrecht
Python 3291 Version:Current License: Permissive (BSD-3-Clause)
cerberusby pyeve
2989 Version:CurrentLightweight, extensible data validation library for Python
cerberusby pyeve
Python 2989 Version:Current License: Permissive (ISC)
SublimePrettyJsonby dzhibas
1985 Version:1.3.1Prettify/Minify/Query/Goto/Validate/Lint JSON plugin for Sublime Text 3 & 4
SublimePrettyJsonby dzhibas
Python 1985 Version:1.3.1 License: Permissive (MIT)
django-widget-tweaksby jazzband
1823 Version:1.4.12Tweak the form field rendering in templates, not in python-level form definitions. CSS classes and HTML attributes can be altered.
django-widget-tweaksby jazzband
Python 1823 Version:1.4.12 License: Permissive (MIT)
panderaby pandera-dev
1240 Version:v0.10.1A light-weight, flexible, and expressive data validation library for dataframes
panderaby pandera-dev
Python 1240 Version:v0.10.1 License: Permissive (MIT)
wtformsby wtforms
1386 Version:3.0.1A flexible forms validation and rendering library for Python.
wtformsby wtforms
Python 1386 Version:3.0.1 License: Permissive (BSD-3-Clause)
ohmyformby ohmyform
2301 Version:1.0.3✏️ Free open source alternative to TypeForm, TellForm, or Google Forms ⛺
ohmyformby ohmyform
Python 2301 Version:1.0.3 License: Strong Copyleft (AGPL-3.0)
django-simple-captchaby mbi
1308 Version:CurrentDjango Simple Captcha is an extremely simple, yet highly customizable Django application to add captcha images to any Django form.
django-simple-captchaby mbi
Python 1308 Version:Current License: Permissive (MIT)
django-phonenumber-fieldby stefanfoulis
1332 Version:7.0.2A django model and form field for normalised phone numbers using python-phonenumbers
django-phonenumber-fieldby stefanfoulis
Python 1332 Version:7.0.2 License: Permissive (MIT)
django-moneyby django-money
1412 Version:3.1Money fields for Django forms and models.
django-moneyby django-money
Python 1412 Version:3.1 License: Others (Non-SPDX)
django-smart-selectsby jazzband
1035 Version:1.6.0chained and grouped selects for django forms
django-smart-selectsby jazzband
Python 1035 Version:1.6.0 License: Permissive (BSD-3-Clause)
awesome-fraud-detection-papersby benedekrozemberczki
1372 Version:v_0005A curated list of data mining papers about fraud detection.
awesome-fraud-detection-papersby benedekrozemberczki
Python 1372 Version:v_0005 License: Permissive (CC0-1.0)
django-recaptchaby praekelt
761 Version:CurrentDjango reCAPTCHA form field/widget integration app.
django-recaptchaby praekelt
Python 761 Version:Current License: Permissive (BSD-3-Clause)
data-validationby tensorflow
720 Version:v1.13.0Library for exploring and validating machine learning data
data-validationby tensorflow
Python 720 Version:v1.13.0 License: Permissive (Apache-2.0)
pyformsby UmSenhorQualquer
598 Version:CurrentPython layer of Windows forms, based on PyQt and OpenGL
pyformsby UmSenhorQualquer
Python 598 Version:Current License: Permissive (MIT)
enforceby RussBaz
544 Version:Current
License: No License (null)Python 3.5+ runtime type checking for integration testing and data validation
enforceby RussBaz
Python 544 Version:Current License: No License
UhOh365by Raikia
571 Version:CurrentA script that can see if an email address is valid in Office365 (user/email enumeration). This does not perform any login attempts, is unthrottled, and is incredibly useful for social engineering assessments to find which emails exist and which don't.
UhOh365by Raikia
Python 571 Version:Current License: Strong Copyleft (GPL-3.0)
ystockquoteby cgoldberg
504 Version:Current License: No License (null)Fetch stock quote data from Yahoo Finance
ystockquoteby cgoldberg
Python 504 Version:Current License: No License
django-formtoolsby jazzband
661 Version:CurrentA set of high-level abstractions for Django forms
django-formtoolsby jazzband
Python 661 Version:Current License: Permissive (BSD-3-Clause)
validate_emailby syrusakbary
481 Version:CurrentValidate_email verify if an email address is valid and really exists
validate_emailby syrusakbary
Python 481 Version:Current License: Others (Non-SPDX)
typesystemby encode
430 Version:CurrentData validation, serialization, deserialization & form rendering. 🔢
typesystemby encode
Python 430 Version:Current License: Permissive (BSD-3-Clause)