Have you created API documentation using Swagger or a similar tool?

Yes, Swagger (now known as OpenAPI) is often used for creating API documentation. It is a tool that allows describing the structure of an API in YAML or JSON format, and then automatically generating interactive documentation.

For example, in Python with Flask, you can use extensions like Flask-RESTPlus or Flask-Swagger to describe endpoints and parameters, and then get a user-friendly web interface with documentation and testing capabilities.

A simple example of describing an endpoint with Flask-RESTPlus:

from flask import Flask
from flask_restplus import Api, Resource

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

@api.route('/hello')
class HelloWorld(Resource):
    def get(self):
        return {'hello': 'world'}

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

After running the application, the documentation will be available at /swagger or / depending on the configuration.

Thus, Swagger helps standardize and simplify the process of documenting APIs, making it understandable and convenient for developers and testers.