Question 1

How to add Flasgger to an existing Flask app?

Accepted Answer

Install via pip, then initialize Swagger with your Flask app instance. Use decorators like @swag_from or docstrings to define specs, and access the interactive docs at /apidocs. The README provides step-by-step examples with colors.py.

Question 2

Flasgger vs FastAPI for API documentation?

Accepted Answer

Flasgger is best for existing Flask apps needing added documentation, as it integrates without rewriting code. FastAPI, in contrast, has built-in OpenAPI generation from type hints but requires adopting its framework. Flasgger offers more flexibility in spec formats but is Flask-specific.

Question 3

Can Flasgger validate nested JSON schemas?

Accepted Answer

Yes, Flasgger supports validation of nested schemas using OpenAPI definitions or Marshmallow schemas. For example, you can define nested objects in YAML or use Marshmallow's Nested fields, and validation will apply recursively as shown in the Palette and Color schema examples.

Question 4

How to customize Swagger UI in Flasgger?

Accepted Answer

You can override templates by providing custom HTML files or configure external JS/CSS via Swagger's settings, such as swagger_ui_css or jquery_js. The README details how to set these in the config and use different Swagger UI versions.

Question 5

Does Flasgger work with Flask-RESTful?

Accepted Answer

Yes, Flasgger is compatible with Flask-RESTful Resources. You can use swag specifications with Resource classes, and examples in the README show how to integrate them seamlessly for structured API development.

Question 6

What happens if validation fails in Flasgger?

Accepted Answer

By default, validation errors abort the request with a 400 status and error message. You can customize this with validation_error_handler functions to handle errors gracefully, as described in the 'Validation Error handling' section.

Flasgger

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