oapi-codegen

Linux · Self-hosted

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Freedom report

Two barsScore 6.3

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

oapi-codegen is ranked #17 of 33 in code generators on Freedom251. It runs on Linux, Self-hosted. There is a free plan.

oapi-codegen plans and pricing

All plans

Open source Free OpenAPI-to-Go code generation; Go 1.25+ required to build and install github.com · 4 Oct 2026

Compared on code generators

Custom templates: Yes
Schema-to-code generation: Yes
CLI available: Yes
Supported languages: Go

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The record

Purpose: oapi-codegen is a command-line tool and library that converts OpenAPI specifications into Go server implementations, API clients, and HTTP models.
OpenAPI support: It supports OpenAPI 3.0 and 3.1, including 3.1 webhooks and nullable type forms; it does not support OpenAPI 2.0 (Swagger).
Server generation: It generates server boilerplate for Chi, Echo, Echo v5, Fiber, Fiber v3, Gin, gorilla/mux, Iris, and net/http.
Strict server: Strict server generation supports multiple request and response media types and status codes, form requests, automatic marshaling, and response status and content-type handling.
Generated clients: Generated clients can use a custom HTTP client and can return either a raw HTTP response or parsed response data.
Large specifications: The tool can split large OpenAPI specifications across multiple Go packages using import mapping or external references.
Customization: Generated Go templates can be overridden, and supported OpenAPI extensions can customize generated types, names, JSON behavior, and struct tags.
Configuration: The tool uses YAML configuration and provides a JSON Schema for editor suggestions; its command-line interface and configuration format are classed as stable.
Integrations: It can be installed as a Go tool or binary and used with go:generate; the project also documents Renovate for updating a pinned configuration schema.
Requirements: Building and installing oapi-codegen requires Go 1.25 or newer; generated code can have lower Go version requirements depending on the server backend.
Compatibility limits: Only the latest minor release receives active development support, bug fixes are not backported, and some imported package internals and template overrides are described as unstable.
Support: The maintainers describe support as best-efforts because they work on the project during off hours from their jobs.
Security: The project links to an organizational security policy and says it may make breaking changes if needed to respond to a security vulnerability.
Price from: Free

Where it ranks on Freedom251

Best Code Generators in 2026#17 of 33

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Sources

github.com/oapi-codegen/oapi-codegen· checked 4 Oct 2026
github.com/oapi-codegen/oapi-codegen/blob/main/SUP· checked 4 Oct 2026