Open-source alternatives to Apistar

Connexion is a specification-driven framework for building APIs that automatically maps OpenAPI specifications to application logic. It uses these specifications to automate routing, request validation, and response serialization, linking API operations to backend handler functions via operation IDs. The project differentiates itself by providing a schema-driven mock server that simulates API behavior using example responses from the specification without requiring backend logic. It also includes a dynamic documentation hosting system that translates the API specification into a live interact

PostgREST is a standalone web server that automatically transforms a PostgreSQL database into a RESTful API. It serves as an API gateway that translates HTTP requests into SQL queries, mapping the database schema directly to endpoints without the need for manual route definitions. The system utilizes a JWT authentication layer to validate user identities and map incoming web requests to specific database roles. This allows the server to delegate authorization and permission enforcement to the internal PostgreSQL role system. It includes a generator for OpenAPI specifications to provide stand

FastAPI is a high-performance Python web framework designed for building REST APIs. It operates as an ASGI web framework, providing a system to create structured HTTP endpoints that automatically serialize data and validate request parameters. The framework utilizes Python type hints to drive data validation and serialization, automatically generating machine-readable OpenAPI and JSON Schema specifications. This process enables the automatic creation of interactive, browser-based API documentation where endpoints can be tested directly. The project includes a dependency injection system for

Restify is a Node.js web framework designed for building scalable RESTful web services and APIs. It provides a server-side environment for creating HTTP network services with integrated routing and request handling. The framework utilizes a middleware-based architecture to process incoming requests and manage responses. This approach supports the construction of web interfaces that follow standard architectural principles to deliver data to clients. The system covers a broad range of backend engineering capabilities, including route-based request dispatching, schema-based request validation,

A small and evil REST framework for Go

A REST framework for quickly writing resource based services in Golang.

A quick and easy way to setup a RESTful JSON API

Falcon is a minimalist Python web API framework and high-performance microservices framework. It serves as a resource-oriented API toolkit designed for building RESTful APIs and data plane services that prioritize low overhead, reliability, and scale. The framework implements an ASGI web server interface to handle both synchronous and asynchronous HTTP requests and WebSockets. It features a dedicated HTTP middleware system for intercepting network traffic and executing shared processing logic across multiple API endpoints. Its capability surface covers resource-based routing, HTTP specificat

Huma is an OpenAPI REST framework for Go designed for building HTTP services with automatic OpenAPI 3.1 specification generation and JSON Schema validation. It serves as a toolkit for developing REST and RPC APIs with typed inputs and outputs, deriving interactive documentation directly from the source code. The framework distinguishes itself by automating the synchronization between implementation and documentation. It uses a content-negotiation engine to manage multiple serialization formats via client headers and employs a JSON Schema input validator to automatically verify request paramet

swagger-node is a toolkit for OpenAPI API development that ensures a project's implementation matches its documented design. It enables the generation of functional API servers and interactive documentation directly from YAML specification files. The project features a system for mapping API endpoints to specific controller functions and a mock mode that simulates API responses from the specification. This allows for API prototyping and frontend development before backend business logic is implemented. The platform provides a command-line interface for project bootstrapping, server managemen

swagger-core is a set of libraries for parsing, generating, and serializing OpenAPI specifications to automate REST API documentation. It provides tools to read, validate, and transform JSON or YAML specifications into programmable objects, as well as a generator that scans source code and annotations to create formal technical descriptions of an API. The project enables bi-directional specification serialization, allowing in-memory API definitions to be converted between native language objects and structured files. It uses a plugin-based scanning mechanism and annotation-driven generation t

Swashbuckle.AspNetCore is an API specification tool and documentation generator for ASP.NET Core. It extracts metadata from source code and models to produce standardized OpenAPI specifications and interactive browser interfaces for exploring and testing web APIs. The project integrates a middleware component to serve these specifications and a Swagger UI for interactive API testing directly from a running application. It also provides a command-line exporter to extract specification files from application assemblies for use in CI/CD pipelines. The tool covers a wide range of capabilities in

mitmproxy2swagger is a tool that transforms captured mitmproxy network traffic into structured OpenAPI schemas for reverse-engineering REST APIs. It functions as an OpenAPI schema converter and network traffic documentation utility, extracting API endpoints and data structures from captured network packets to create formal technical references. The tool enables the reconstruction of undocumented APIs by converting intercepted HTTP request and response patterns into specifications. It supports merging multiple traffic capture files into a single schema to incrementally expand an API map and ut

AWS Powertools for Python is a utility framework designed for building production-ready Python functions on AWS Lambda. It provides a comprehensive suite of tools for observability, event parsing, routing, and idempotency management to streamline the development of serverless applications. The project distinguishes itself through specialized capabilities for event-driven architectures and AI agent orchestration. It enables the implementation of AI agents by exposing functions as tools via OpenAPI schemas and managing conversation states. Additionally, it features an idempotency library that p

Hug is a type-driven Python web framework designed for building APIs. It uses Python type annotations to automatically validate and convert incoming request data and to format outgoing responses. The framework functions as an automated documentation tool by extracting function signatures and markers from source code to generate accessible API specifications. It also supports non-blocking coroutines for asynchronous API processing to handle background tasks without interrupting the main request cycle. The project provides capabilities for REST API development, including route mapping, endpoin

This project is a comprehensive sample library and implementation guide for ASP.NET Core. It provides a collection of practical examples and projects that demonstrate how to build web applications, RESTful APIs, and high-performance services. The repository focuses on a variety of architectural patterns, including the development of Minimal APIs, contract-first gRPC services, and real-time communication using WebSockets and Server-Sent Events. It includes detailed implementations for user identity and security, such as token-based authentication and CSRF protection. The codebase covers a bro

Hug is a Python API framework used for building web services by mapping functions to HTTP endpoints via decorators and type annotations. It functions as a type-based validator that automatically converts and validates incoming request data based on Python type hints and serves as a WSGI-compliant web framework for deployment on production servers. The project is distinguished by its ability to automatically generate API specifications and user-facing documentation derived from function signatures. It further extends the utility of internal logic by exposing functions as terminal commands thro

This project is the JavaScript reference implementation of the GraphQL specification. It provides a query engine and schema parser designed to parse, validate, and execute queries to retrieve or mutate data based on a defined schema. The implementation includes a framework for mapping codebase structures to a strongly typed system and a tool for converting query strings into abstract syntax trees for programmatic analysis. The library covers the full surface of GraphQL API implementation, including schema definition, language parsing, and query validation. It provides the necessary infrastru

Salvo is a comprehensive Rust web framework for building asynchronous HTTP servers and web applications. It features a hierarchical web router that uses a tree-based structure to map requests to handlers and an asynchronous middleware pipeline based on the onion model for request and response pre- and post-processing. The framework is distinguished by its native support for modern network protocols, including a QUIC-based HTTP/3 implementation alongside HTTP/1 and HTTP/2. It includes an integrated OpenAPI documentation generator that extracts schemas directly from handler signatures to produc

Goa is a design-first Go framework that generates server and client code, documentation, and request validation from a single declarative domain-specific language (DSL). At its core, it provides a Go DSL for defining API endpoints, data types, and error models, which compiles into fully functional HTTP and gRPC server stubs, client packages, and OpenAPI specifications. The framework distinguishes itself through its plugin-extensible code generation pipeline, allowing custom code generation steps, middleware, or transport layers to be added via plugins. It supports multiple transport protocols

ReDoc is an OpenAPI documentation generator that transforms OpenAPI and Swagger specifications into interactive, three-panel API reference websites. It provides a system for generating these references as standalone static HTML files or as embedded UI components for integration into existing websites and developer portals. The tool organizes API specifications into a responsive layout featuring a navigation sidebar, detailed endpoint descriptions, and language-specific code samples. It supports the visualization of complex data models by mapping schema definitions to human-readable tables and

Beego is a high-performance toolkit for building web applications and RESTful APIs using the Go programming language. It is structured as an MVC web framework that separates data models, views, and controllers to organize application logic. The project provides a comprehensive suite of integrated tools, including an object-relational mapper for translating code objects into database tables and a session manager for maintaining user identity and state across server requests. It also includes an internationalization framework for managing multilingual content and translating text based on user

This is a framework for building standardized RESTful APIs within Laravel and Lumen applications. It provides a structured environment for developing web services with integrated routing, request handling, and versioning. The project distinguishes itself through a multi-adapter authentication system that validates identities via various schemes and third-party providers. It features a dedicated response transformation layer to convert raw database models into consistent output structures and an internal dispatcher that allows application logic to trigger API endpoints without external network

This project is a REST API framework for NestJS designed to automate the creation of boilerplate-free CRUD endpoints and resource management. It functions as an automated CRUD generator that produces controllers and services for standard database operations, accelerating the development of RESTful APIs. The toolkit includes a REST query parser that translates complex URL parameters into structured database filters, pagination, and sorting rules. It also operates as an API response serializer to control the exposure of entity fields and manage nested relations within JSON responses. For extend

Moleculer is a Node.js microservices framework designed for building distributed systems. It functions as a distributed service broker, task orchestrator, and service mesh framework, enabling a decentralized architecture with built-in service discovery and load balancing. The project differentiates itself through a pluggable transport layer supporting protocols such as NATS, Redis, TCP, and Kafka, as well as a dedicated microservices API gateway that maps external HTTP and WebSocket requests to internal service actions. It includes built-in fault tolerance mechanisms, including circuit breake

LoopBack Next is a Node.js API framework used for building REST and multi-protocol APIs. It functions as an OpenAPI server implementation that can either generate machine-readable specifications from code or produce implementation controllers and models from existing specifications. The framework distinguishes itself through a central dependency injection container and a repository-pattern data access layer. This architecture decouples application logic from component construction and persistent storage, allowing for a pluggable system where data sources and business logic are isolated throug

Django REST Framework is a toolkit for building standards-compliant web services that map complex data models to structured HTTP responses. It provides a modular architecture for handling the request lifecycle, including authentication, permission checks, and content negotiation. The framework is designed to facilitate the development of robust APIs by transforming complex data types into native formats and validating incoming request payloads against defined schemas. The project distinguishes itself through a highly modular, class-based design that allows developers to build complex views an