ogen-go/ogen

Health v2 · maintenance only

Adoption not part of the score

2131 stars · 181 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

ogen is an OpenAPI v3 code generator for Go that produces statically typed client and server code from an OpenAPI specification. It generates optimized JSON encoding, validation, a static radix router, sum types for oneOf, and optional/nullable wrappers without reflection or interface{} on the hot path.

Use cases

• generate a type-safe Go server from an OpenAPI v3 spec
• generate a Go REST API client from swagger/openapi yaml
• avoid writing boilerplate request parsing and validation code
• get fast JSON encoding without encoding/ reflection overhead
• generate sum types for oneOf schemas in Go
• add OpenTelemetry tracing and metrics to a generated API server
• generate SSE clients from an OpenAPI spec

When to choose

• you have an OpenAPI v3 spec and want fully typed Go client and server code
• you want code-generated validation and routing with no reflection
• you need optional/nullable field handling without pointer soup
• you want a stable, actively maintained generator with batteries-included observability

When to avoid

• your API spec is not OpenAPI v3 (e.g., only Swagger 2.0)
• you need dynamic or runtime-configurable API behavior rather than static codegen
• you prefer hand-written handlers with minimal generated code
• your spec uses features ogen does not support yet

Facets

cli-tool · maturity stable

web-framework http-server http-client serialization routing form-handling cli developer-tools apis web-development backend go cli cross-platform openapi openapi-v3 codegen rest-api swagger type-safe static-typing radix-router opentelemetry sse code-generation docker

Member repositories

For agents

markdown · JSON · MCP: product_card(name="ogen-go/ogen")