https://pythongeeks.org/flask-wtf/

1. In this article, we will discuss Python Flask WTF. Form handling is a
crucial aspect of building web applications, allowing users to input
data that can be processed and stored on the server. Flask, a popular
web framework for Python, provides a simple and lightweight way to
build web applications. However, handling forms in Flask can be
challenging due to the complexity of managing form data, validating
inputs, and handling security concerns. Flask WTF (WTForms) is a
powerful extension for Flask that simplifies form handling, making it
easier for developers to create robust and secure web applications.

2. Flask WTF, also known as WTForms, is a Python library that
provides a set of tools for handling web forms in Flask
applications. It is an extension for Flask that allows developers to
define forms using Python classes, which are then rendered as
HTML forms. Flask WTF provides built-in support for form
validation, data sanitization, and protection against cross-site
scripting (XSS) attacks and cross-site request forgery (CSRF)
attacks. It makes it a comprehensive solution for secure form
handling in Flask web applications.

3. Flask WTF offers several benefits for developers when it comes to
handling forms in Flask applications
1. Simplified Form Definition
2. Built-in Form Validation
3. Data Sanitization
4. Protection Against XSS and CSRF Attacks
5. Easy Integration with Flask

4. Using Flask WTF is straightforward and involves the following steps:
1. Install Flask WTF
2. Import Flask WTF
3. Define Form Classes
4. Render HTML Form
5. Handle Form Submission
6. Add CSRF Protection
7. Customize Form Rendering

5. Handling forms in Flask web applications can be complex, but Flask
WTF simplifies the process by providing a comprehensive set of
tools for form handling. It includes form definition, validation, data
sanitization, and protection against common web vulnerabilities.
With Flask WTF, developers can easily create robust and secure web
forms, making it a valuable tool for building modern web
applications with Flask. Whether you are a beginner or an
experienced Flask developer, Flask WTF is a powerful extension that
can streamline your form handling process and enhance the
security of your web applications.