# oapi-codegen/oapi-codegen

Generate Go client and server boilerplate from OpenAPI 3 specifications

Repository: https://github.com/oapi-codegen/oapi-codegen
Canonical: https://ross.abutalabs.com/products/oapi-codegen
Language: Go
License: Apache-2.0
License Family: permissive
Topics: openapi3, golang, swagger, openapi, rest-api, go, openapi-codegen, openapi-generator, rest-api-client
Last push: 2026-08-26T21:51:17+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 81, longevity 100
- inputs: {"age_days": 2744, "days_push": 7, "days_rel": 47, "gap_med": 49.0, "n_releases_24m": 9}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 8534, forks 1056 (observed 2026-08-28T04:10:23.359322+00:00)

## What it is
oapi-codegen is a command-line tool and Go library that generates Go server boilerplate, API clients, and HTTP models from OpenAPI 3.0/3.1 specifications. It reduces boilerplate so developers can focus on business logic while keeping generated code idiomatic and simple.

## Use cases
- generate go server stubs from an openapi 3 spec
- create a typed go rest api client from swagger
- generate go models from openapi yaml
- spec-first api development in go
- split large openapi specs into multiple go packages
- validate openapi spec types against go type system

## When to choose
- you build Go services or clients against an OpenAPI 3.0/3.1 spec and want spec-first codegen
- you want idiomatic, readable generated Go code rather than heavily abstracted output
- you need server boilerplate for popular Go routers or a typed HTTP client

## When to avoid
- your API is defined in Swagger 2.0 rather than OpenAPI 3.x
- you work outside the Go ecosystem
- you prefer runtime schema validation over generated code

## Facets
- artifact type: cli-tool
- maturity: active
- function: api-framework, http-client, http-server, developer-tools
- domain: developer-tools, apis, web-development, backend
- platform: go, cli, cross-platform
- tags: openapi, openapi3, swagger, rest-api, codegen, go, code-generation

## Member repositories
- oapi-codegen/oapi-codegen (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:23.359322+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:26:21.307960+00:00, confidence not recorded.
  - readme: https://github.com/oapi-codegen/oapi-codegen (fetched 2026-08-28T04:10:23.359322+00:00, sha b7fecadc6245)
- Data as of 2026-08-30T08:39:29.467469+00:00.