Code First
Code First on the APIs.io network is a curated area collecting 0 resources — specifications, tools, and documentation — for this subject.
24 providers on the network work in this area, including API-First, TypeSpec, Smithy, Templates, Postman, Apidog, and 18 more — each links out to that provider’s APIs, schemas, and governance artifacts.
Related areas: Database Schema Design and Schema Design. Browse every area at areas.apis.io.
About this area
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.
Related providers (81)
Top 24 of 81 network providers tagged for this area — search the full set on apis.io.
| Provider | Description | APIs | Rating |
|---|---|---|---|
| API-First | API-First is a software development methodology where APIs are treated as first-class citizens and designed before implementation begins. In an API-first approach, teams establi... | 4 | minimal |
| 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 la... | 6 | thin |
| 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... | 2 | thin |
| Templates | A cross-industry subject-matter collection covering API design templates, code templates, documentation templates, API specification templates, and templating engines used in AP... | 6 | minimal |
| Postman | Postman is the world's leading API platform, used by 35+ million developers to design, build, test, document, mock, monitor, and govern APIs across the entire API lifecycle. The... | 17 | exemplar |
| Apidog | Apidog is an all-in-one API development platform that connects the entire API lifecycle: visual API design, multi-protocol debugging (HTTP, REST, GraphQL, gRPC, WebSocket, SOAP,... | 1 | strong |
| APIMatic | APIMatic is a developer experience platform for APIs that specializes in automated SDK generation, API documentation portal creation, specification validation and linting, and A... | 2 | developing |
| SwaggerHub | SwaggerHub is SmartBear's enterprise collaborative API design and documentation platform built around the OpenAPI specification. It provides tools for designing, building, docum... | 2 | developing |
| GitHub Copilot | APIs and resources for GitHub Copilot, an AI pair programmer that helps you write code faster. | 12 | developing |
| RapidAPI | RapidAPI operates the world's largest API marketplace, connecting developers to thousands of APIs through a single platform. Their developer platform provides tools for API disc... | 6 | developing |
| APIGit | APIGit is a Git-native platform for full lifecycle API development that combines version control, API design, documentation generation, governance, testing, and dynamic mock ser... | 1 | developing |
| PydanticAI | PydanticAI is an open-source, model-agnostic Python agent framework built by the Pydantic team, designed to bring the ergonomic, type-safe design philosophy of FastAPI to produc... | 2 | developing |
| Fern | Fern is an SDK generation and documentation platform designed for the AI era. It transforms OpenAPI, AsyncAPI, Protobuf (gRPC), and OpenRPC specifications into idiomatic, produc... | 1 | developing |
| SmartBear | SmartBear is a software company that provides AI-powered tools for API lifecycle management including design, testing, documentation, and governance. Their product portfolio inc... | 3 | developing |
| Stainless | Stainless is an API developer experience platform that generates best-in-class SDKs, interactive documentation, production-ready CLI tools, MCP servers, and Terraform providers ... | 5 | developing |
| Zally | Zally is an open source API linter from Zalando that validates OpenAPI 2 and 3 specifications against configurable rule sets for API design consistency. It exposes a REST API, c... | 1 | developing |
| Stoplight | Stoplight is a collaborative, design-first API platform providing a visual editor for OpenAPI specifications, interactive hosted documentation, automatic mock servers, API style... | 6 | developing |
| Google Gemini | Google's multimodal AI model APIs for text, image, audio, and video understanding. | 14 | developing |
| Architecture Pattern | Architecture Patterns provide reusable solutions to commonly occurring software and system design problems. They offer proven templates for organizing code, components, and inte... | 1 | developing |
| Architectural Design Patterns | Architectural Design Patterns are reusable solutions to commonly occurring problems in software architecture. They provide templates for designing system structure, component in... | 1 | developing |
| Insomnia | Insomnia is an open-source, cross-platform API development platform by Kong for designing, debugging, and testing HTTP, REST, GraphQL, gRPC, SOAP, WebSockets, SSE, and Socket.IO... | 2 | thin |
| Spectral | Spectral is an open-source API style guide enforcer and linter from Stoplight, providing a flexible JSON/YAML linting engine with built-in support for OpenAPI (v3.1, v3.0, v2.0)... | 1 | thin |
| UML | UML (Unified Modeling Language) is the standard modeling language for software architecture, system design, and technical documentation. Governed by the Object Management Group ... | 2 | thin |
| Swagger Codegen | Swagger Codegen is an open-source template-driven code generation tool that automatically generates client libraries, server stubs, and API documentation from OpenAPI Specificat... | 2 | thin |
Related areas
Tags: API Design, Code Generation, Code-First, Decorators, Development Methodology, Software Architecture, Type Safety.
Sourced from the api-evangelist/code-first topic repo.