Hi I have a model here I created that I want to make optional in swagger doc for my PUT request test_model = api.model('test', { 'test_field': fields.List( fields.Integer, required=False, description='general description', default=[] ) }) I have then use the 2 API functions for my PUT Request @api.expect(test_model, validate=True) @api.doc(description="general desc") If someone could point out what I'm doing wrong here or how to make it optional I would be very appreciative. Continue reading...