Okapi vs Huma

Both Okapi and Huma aim to improve developer experience in Go APIs with strong typing and OpenAPI integration. The key difference is philosophy: Okapi is a batteries-included web framework, while Huma is an API layer designed to sit on top of existing routers.

Feature / Aspect	Okapi	Huma
Positioning	Full web framework	API framework built on top of existing routers
Router	Built-in high-performance router	Uses external routers (Chi, httprouter, Fiber, etc.)
OpenAPI Generation	Native, framework-level (Swagger UI & Redoc included)	Native, schema-first API design
Request Binding	Unified binder for JSON, XML, forms, query, headers, path params	Struct tags + resolver pattern for headers, query, path params
Validation	Tag-based (min, max, enum, required, default, pattern, etc.)	Included
Response Modeling	Output structs with Body pattern; headers & status via struct fields	Strongly typed response models with similar patterns
Middleware	Built-in + custom middleware, groups, per-route middleware	Router middleware + Huma-specific middleware and transformers
Authentication	Built-in JWT, Basic Auth, security schemes for OpenAPI	Security schemes via OpenAPI; middleware via router
Dynamic Route Management	Enable/disable routes & groups at runtime	Not a core feature
Templating / HTML	Built-in rendering (HTML templates, static files)	API-focused; not intended for HTML apps
CLI Integration	Built-in CLI support (flags, env config)	Included
Testing Utilities	Built-in test server and fluent HTTP assertions	Relies on standard Go testing tools
Learning Curve	Very approachable for Go web developers	Slightly steeper (requires OpenAPI-first mental model)
Use Case Fit	Full web apps, APIs, gateways, microservices	Pure API services, schema-first API design
Philosophy	“FastAPI-like DX for Go, batteries included”	“OpenAPI-first typed APIs on top of your router of choice”

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Quick Comparison

Okapi — define a route with built-in validation and OpenAPI metadata:

app:=okapi.Default()
app.Register(okapi.RouteDefinition{
     Method:      http.MethodPost,
     Path:        "/users",
     Handler:     createUser,
     OperationId: "create-user",
     Summary:     "Create a new user", 
     Tags: []string{"users"},
     Request: &UserRequest{},
     Response:    &User{},
})

Huma — similar concept, different style:

huma.Register(api, huma.Operation{
    OperationID: "create-user",
    Method:      http.MethodPost,
    Path:        "/users",
    Summary:     "Create a new user",
    Tags:        []string{"Users"},
}, createUser)

Both approaches generate OpenAPI documentation automatically.

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When to Choose Which?

Choose Okapi if you want:

• A batteries-included web framework with routing, middleware, auth, OpenAPI, templates, and CLI in one cohesive package
• FastAPI-like developer experience that feels idiomatic in Go
• Dynamic route control — enable or disable routes and groups at runtime
• To build APIs and serve HTML pages or static assets from the same application

Choose Huma if you want:

• A schema-first, OpenAPI-driven API layer where the spec drives your implementation
• To keep using your existing router (Chi, Fiber, Echo, etc.) without adopting a new framework
• Strict typed request/response contracts as your primary design model
• A minimal, API-only stack without broader web framework concerns

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Community & Maturity

• Huma: More established with a larger community and extensive production usage
• Okapi: Newer and rapidly evolving, with a smaller but growing community

Both are actively maintained. Choose based on your architectural preferences and project needs rather than stability concerns alone.

Note: If you’re already using Huma with Chi or another router and it’s working well for you, there’s no urgent reason to switch. Okapi is ideal for new projects or when you want a more integrated, batteries-included framework experience.