spec-first/connexion

Health v2 · maintenance only

Adoption not part of the score

4611 stars · 782 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Connexion is a Python web framework for spec-first (API-first) development, where the API is described in an OpenAPI/Swagger specification that the framework enforces. It provides automatic routing, request/response validation, authentication, parameter injection, response serialization, a Swagger UI console, and a CLI for running and mocking specifications, working standalone or with any ASGI/WSGI framework.

Use cases

• build a REST API from an OpenAPI spec
• validate request and response bodies against an OpenAPI schema
• auto-register routes from a swagger yaml file
• serve a Swagger UI console for my API
• mock an API from an OpenAPI specification
• add authentication to an OpenAPI-based API
• run a spec-first microservice in Python

When to choose

• you design APIs contract-first with OpenAPI/Swagger and want the spec enforced at runtime
• you want automatic validation, routing, and docs from a single specification
• you need a framework that layers on top of existing ASGI or WSGI apps

When to avoid

• you prefer code-first API development without maintaining a spec file
• you need a minimal framework with no specification overhead
• your API is not REST/HTTP-based or has no OpenAPI definition

Facets

framework · maturity active

web-framework api-framework auth middleware routing serialization mock-api cli web-development backend apis microservices developer-tools python cross-platform openapi swagger spec-first api-first asgi wsgi request-validation swagger-ui

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