Most Flask Apps Miss This: Auditable Input Validation & Detecting Unvalidated Routes

Flask gives you a lot of flexibility—but input validation is often an afterthought. In my day job, I work in application security across architecture, engineering, and operations. A big part of what my team does is helping development teams fix findings from SAST/DAST scans and code reviews. And one issue comes up over and over: Unvalidated input making its way into application logic. ⸻ The gap I keep seeing When working with Flask applications, there are great options: Flask-WTF for full UI app