Flask API

Flask — Benefits & UtilizationflaskFlask remains one of the most widely deployed Python web frameworks in 2026, despite the rise of FastAPI,… Flask — Production DeploymentflaskFlask's built-in / server is the Werkzeug development server. Flask — OverviewflaskTop row: request flowing in. Flask — Building REST APIsflaskFlask remains one of the most pragmatic frameworks for building REST APIs in Python. Flask — Sample CodeflaskThis page is a code-heavy cookbook for building production Flask services, with a bias toward ML-serving use…

1. Overview

Flask is a lightweight Python WSGI web framework (Werkzeug + Jinja2) widely used for REST APIs, ML model-serving microservices, internal tools, and webhook receivers. This section covers Flask end-to-end: architectural overview, benefits and when to reach for it, building REST APIs with validation and auth, runnable sample code for CRUD and ML serving, and production deployment with gunicorn, nginx, Docker, and Kubernetes.

2. Pages

Flask — OverviewflaskMicro-framework design, WSGI fundamentals, request/response lifecycle, core components, Flask vs FastAPI vs… Flask — Benefits & UtilizationflaskWhy Flask still matters: flexibility, extension ecosystem, production utilization patterns, honest “when not… Flask — Building REST APIsflaskRouting, blueprints, validation (Marshmallow/Pydantic), error handling, HTTP status codes, JWT auth, CORS,… Flask — Sample CodeflaskRunnable examples: CRUD with SQLAlchemy, JWT auth with refresh rotation, file upload, scikit-learn and… Flask — Production DeploymentflaskGunicorn, nginx, multi-stage Docker, Kubernetes Deployment/HPA, 12-factor config, structured logging,…
FastAPI for REST APIsapisAsynchronous counterpart to Flask; compare when you need native async and OpenAPI-by-default. Understanding and Implementing APIsapisREST, SOAP, GraphQL, gRPC fundamentals.

4. Where each page fits

Flask section map: learn, build, ship Overview architecture, lifecycle Benefits when to choose Flask REST APIs routing, validation, auth Sample Code CRUD, JWT, ML serving Deployment gunicorn, nginx, Docker, Kubernetes

The five pages form a path. Start with the Overview for the WSGI model and the request lifecycle, and use Benefits to decide whether Flask is the right tool. Building REST APIs and Sample Code cover building the service, and Production Deployment covers running it behind gunicorn and nginx, in containers and on Kubernetes.

FrameworkModelChoose when
FlaskSynchronous WSGI, minimal core plus extensionsSmall to medium APIs, ML model serving, internal tools, maximum flexibility
FastAPIASGI, async, type-hint validation, automatic OpenAPIHigh-concurrency I/O-bound APIs, schema-first contracts
DjangoBatteries included: ORM, admin, authFull web applications with a relational data model