Flask OpenAPI

Simple Flask API with OpenAPI documentation.

Flask API template with flask-openapi3 documentation. Easy to use and extend.

Installation

Virtual Environment

Install by creating a virtual environment with python3 -m venv .venv. Then, activating it by

Windows:

.venv\Scripts\activate

Linux/MacOS:

source .venv/bin/activate

Dotenv

Create a .env file by copy from .env.example and fill in the values.

cp .env.example .env

• ENVIROMENT - Environment of the application. production for production mode other value will be development mode.

Install Dependencies

pip install -r requirements.txt

Usage

Start application

Start appllication have 2 options:

1. Use python src/index.py command to launch application. However, this option is not recommended for production.
2. Use flask command or anything else to launch application. To use this option, you need to change directory to src folder first, with command cd src. Then, use flask run to launch application.

for option 2, you can see more detail in Flask Documentation

OpenAPI Documentation

By default, OpenAPI documentation is available at /api/docs endpoint.

Implementation

• src/index.py - Main application entrypoint.
• src/api/register_routes.py - Add routes here.
• src/api/schema.py - Define tag, common request/response schema or anything eles here.
• src/api/controller - Create any route class in this folder

For instance, create echo_post.py as a new route by creating a new file in src/api/controllers/echo folder. Then, after finish your code in new route, don't forget to adding new route to src/api/register_routes.py for register route. Otherwise, route wouldn't reached.

Simple route example

from http import HTTPStatus

from api.routes import Api
from api.schema import ApiTag, DefaultErrorResponse
from api.schema.example import ExampleResponse

class ExampleRoute(Api):
    def register(self, app):
        @app.get(
            "/example",
            description="Example route",
            tags=[ApiTag.Example],
            responses={
                HTTPStatus.OK: ExampleResponse,
                HTTPStatus.INTERNAL_SERVER_ERROR: DefaultErrorResponse,
            },
        )
        def example():
            try:
                return ExampleResponse(message="example").model_dump(), HTTPStatus.OK
            except Exception as e:
                return (
                    DefaultErrorResponse(stacktrace=e.__str__()).model_dump(),
                    HTTPStatus.INTERNAL_SERVER_ERROR,
                )