webargs_poc.py

from flask import Flask
from marshmallow import fields
from webargs.flaskparser import use_args

app = Flask(__name__)

hello_args = {
    'name': fields.Str(required=True)
}

@app.route('/')
@use_args(hello_args)
def index(args):
    return 'Hello ' + args['name']

if __name__ == '__main__':
    app.run()