How can I implement input validation in Flask-RESTful?

How can I implement input validation in Flask-RESTful?

You can use the reqparse module from Flask-RESTful to handle input validation. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

from flask import Flask
from flask_restful import Api, Resource, reqparse

app = Flask(__name__)
api = Api(app)

parser = reqparse.RequestParser()
parser.add_argument('name', type=str, required=True, help='Name cannot be blank')
parser.add_argument('age', type=int, required=True, help='Age cannot be blank')

class User(Resource):
    def post(self):
        args = parser.parse_args()
        return {'name': args['name'], 'age': args['age']}, 201

api.add_resource(User, '/user')

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

This code sets up a simple API that validates input for name and age.

What if I want to add more complex validation rules?

For more complex validation, you might consider using libraries like Marshmallow or Cerberus, which offer more features for schema validation.