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Code First
Code-first is an API design and software development approach where the application's source code is the primary source of truth and the API contract (OpenAPI document, GraphQL schema, gRPC proto, type definitions) is generated from that code via decorators, annotations, type inference, or runtime introspection. It contrasts with the design-first (or contract-first) approach in which a hand-authored OpenAPI/GraphQL/Proto contract is written first and code is scaffolded from it. Code-first approaches are widely used in TypeScript, Python, Java, Go, and C# ecosystems where strong type systems make schema generation reliable.
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Providers working in Code First
Providers whose own tags share at least two of this topic's tags, most shared first.
| Provider | About | Rating | APIs |
|---|---|---|---|
| Hey API | Hey API builds open-source OpenAPI code generators and a hosted specification registry. @hey-api/openapi-ts turns an OpenAPI document into production-grade TypeScript — SDKs, types, Zod/Valibot/TypeBox validators, TanStack Query and SWR ho… | developing | 1 |
| The Guild | The Guild is an open-source software group building much of the GraphQL ecosystem's tooling, published together at the-guild.dev. Its portfolio spans GraphQL Hive (schema registry, usage observability and breaking-change detection), GraphQ… | thin | 10 |
| Ogen | Ogen is an Apache-2.0 OpenAPI v3 code generator for Go, maintained by the ogen-go organization. It reads an OpenAPI v3 document at build time and emits a statically typed Go client and server: code-generated JSON encoding with no reflectio… | thin | 1 |
| TypeSpec | TypeSpec is an API description language developed by Microsoft for defining API shapes that compile to OpenAPI, JSON Schema, Protobuf, and other output formats. It provides a language and toolchain for describing REST APIs, gRPC services,… | thin | 6 |
| Smithy | Smithy is an open source, protocol-agnostic interface definition language (IDL) and toolchain developed at AWS for defining, validating, and generating API clients, servers, and documentation for any programming language. It powers the AWS… | thin | 2 |
| Design Patterns | Reusable solutions to commonly occurring problems in software design, including the Gang of Four catalog (creational, structural, behavioral) and core API design patterns such as HATEOAS, idempotency keys, webhooks, and sagas. | emerging | 1 |
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API DesignCode GenerationCode-FirstDecoratorsDevelopment MethodologySoftware ArchitectureType Safety