Simple, declarative syntax. Define your arguments as a mapping rather than imperatively pulling values off of request objects.

Code reusability. If you have multiple views that have the same request parameters, you only need to define your parameters once. You can also reuse validation and pre-processing routines.

Self-documentation. Webargs makes it easy to understand the expected arguments and their types for your view functions.

Automatic documentation. The metadata that webargs provides can serve as an aid for automatically generating API documentation.

Cross-framework compatibility. Webargs provides a consistent request-parsing interface that will work across many Python web frameworks.