Open-source alternatives to Swagger Php

springdoc-openapi is a library and toolset that analyzes Spring applications at runtime to produce machine-readable OpenAPI specifications in JSON and YAML formats. It serves as an integrator that extracts API metadata from Java source code and annotations to automate documentation for Spring-based services. The project distinguishes itself through its ability to aggregate API specifications from multiple remote microservices into a single unified interface and provide multiple visualization options, including Swagger UI and Scalar. It also offers a dedicated plugin for exporting documentatio

Fern is a toolset for managing API specifications, generating type-safe client libraries, and producing hosted developer documentation. It provides a utility for validating, transforming, and exporting API definitions into standardized OpenAPI formats, serving as a system to maintain a consistent source of truth for API designs. The project differentiates itself through an automated SDK distribution pipeline that publishes generated libraries to package managers such as npm, PyPI, Maven, and NuGet. It also includes an AI-powered search assistant trained on API and SDK specifications to answer

Flasgger is a documentation framework for Flask applications that generates OpenAPI specifications and an integrated Swagger UI. It functions as a documentation generator and specification parser that extracts API schemas from route definitions, function docstrings, and external specification files. The tool allows API definitions to be maintained either within the source code using YAML blocks in docstrings or decoupled into standalone YAML files. It provides a browser-based interactive console for testing and exploring API endpoints directly from the web application. Beyond documentation,

This project is an automated documentation generator that synchronizes API reference materials with actual code behavior. By capturing live HTTP request and response data during the execution of existing test suites, it ensures that documentation remains accurate and consistent with the underlying application. The tool distinguishes itself by integrating directly into the test runner lifecycle, allowing developers to define API specifications and metadata within their test blocks. This approach enables a test-driven documentation workflow where API behavior is recorded and mapped to structure

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

NSwag is a toolchain for the .NET ecosystem designed to automate the generation of API documentation, server controllers, and typed client proxies from OpenAPI contracts. It functions as a contract-first API tool that enables the creation of server-side boilerplate and client libraries based on predefined specifications. The suite distinguishes itself through its ability to extract OpenAPI specifications from existing ASP.NET Core code via reflection and its capacity to generate type-safe TypeScript client proxies. It also provides an interactive documentation server that hosts and renders th

Django Ninja is a high-performance framework for building type-safe REST APIs using Django. It functions as an OpenAPI API framework and a type-safe wrapper that utilizes Python type hints to handle request validation and response serialization. The project distinguishes itself by integrating Pydantic-based data modeling to convert JSON inputs into strongly typed Python objects. It automatically generates OpenAPI schemas and interactive documentation pages directly from defined endpoint signatures. The framework supports asynchronous request processing to handle concurrent tasks. It employs

utoipa is a Rust API documentation tool used to generate machine-readable OpenAPI specifications. It functions as a specification generator and schema mapper that converts Rust structs and enums into compliant OpenAPI schemas. The project distinguishes itself by using procedural macros and traits to automate metadata extraction from code. It supports complex data modeling, including generics, polymorphism, and recursive type resolution, while synchronizing field renaming and tagging from serialization attributes. It also enables the composition of modular specifications, allowing multiple sma

Litestar is a high-performance Python ASGI web framework designed for building asynchronous APIs and web services. It functions as a type-safe toolkit that leverages Python type hints to provide automatic request validation and response serialization, while natively generating interactive API documentation based on the OpenAPI specification. The framework is distinguished by its integrated dependency injection system, which manages shared resources and resolves complex nested service chains directly within request handlers. It further organizes API development through class-based controllers

dlt is a Python data ingestion tool and ETL pipeline framework designed to fetch data from diverse sources and persist it into structured destinations. It functions as a schema inference engine that automatically detects data types and flattens nested JSON structures into relational tables, moving data from sources to lakehouses, warehouses, or vector databases. The project distinguishes itself through AI-powered pipeline generation, using large language models to scaffold extraction code and connectors for REST APIs. It also supports multimodal vector storage and specialized population of ve

openapi-devtools is a browser extension and OpenAPI specification generator that captures network traffic to automatically document the API structures of websites and applications. It functions as an HTTP traffic capturer and browser-based documentation tool, mapping real-time network requests into standardized API specifications. The tool enables API reverse engineering by intercepting outbound HTTP traffic and using heuristic-based merging to combine headers, bodies, and parameters from multiple requests into unified endpoint definitions. These captured definitions can be visualized as huma

Elysia is a high-performance TypeScript web framework designed for building type-safe backend services. It provides a modular, plugin-based architecture that allows developers to compose server logic, middleware, and validation schemas into scalable application instances. By leveraging native web standards, the framework ensures portability across diverse JavaScript runtimes, including Node.js, Deno, and various edge computing environments. The framework distinguishes itself through its focus on end-to-end type safety, automatically synchronizing request and response definitions between the s

apidoc is a source-code API documentation generator that parses specialized annotations within comments to automatically create a searchable API documentation website. It functions as an annotation-based API parser and a static documentation site generator, extracting definitions directly from the codebase to maintain a synchronized reference. The tool is designed as a multi-language parser, using configurable regular expressions to extract metadata from various programming languages. It can also serve as a JSON API definition exporter, converting source-code comments into raw JSON files for

Sphinx is an extensible documentation framework and multi-format document publisher. It serves as a technical content organizer that converts reStructuredText markup and Python source code comments into structured documentation for technical projects. The system transforms a single set of markup files into multiple output formats, including HTML, LaTeX, EPUB, and Texinfo. It functions as a Python API documentation tool, extracting documentation directly from source code to maintain synchronized technical reference manuals. The framework organizes complex information into hierarchies with aut

This project provides a framework for managing multi-agent systems, designed to automate complex software development, infrastructure, and business workflows. It functions as a multi-agent workflow orchestrator that routes tasks to domain-specific workers while maintaining state persistence and infrastructure automation. By leveraging large language models, the system decomposes high-level objectives into actionable plans, ensuring that complex operations are executed with consistency and reliability. The framework distinguishes itself through its hierarchical agent registry and policy-driven

FastMCP is a Python framework designed for building servers that expose functions, resources, and prompts to AI models using the Model Context Protocol. It simplifies the development process by automatically deriving tool metadata, input schemas, and documentation directly from Python function signatures and type hints. The framework provides a unified container for managing these components, allowing developers to build modular applications that integrate seamlessly with AI assistants. The project distinguishes itself through its support for interactive, server-defined user interface compone

Strawberry is a type-safe GraphQL library for Python that enables the design of schemas using Python type annotations and dataclasses. It functions as an asynchronous GraphQL server and execution engine, providing a bridge to expose schemas across ASGI-compliant web frameworks such as FastAPI, Django, Flask, and Litestar. The project implements GraphQL Federation, allowing for the creation of distributed schemas and entities that merge into a unified supergraph across multiple services. It also includes a dedicated toolkit for the Relay specification, supporting global object identification a

Swagger-jsdoc is a documentation utility that automates the creation of standardized interface specifications for web services and RESTful endpoints. It functions as a documentation builder that extracts metadata directly from source code comments and configuration files to maintain synchronized interface definitions alongside application logic. The tool parses code structures and merges disparate configuration files to produce machine-readable documentation that adheres to industry standards. By utilizing rule-based validation, it ensures that the generated output complies with formal struct

Pydantic is a data validation and serialization library that enforces schema constraints and performs type conversion on complex data structures. It utilizes standard Python type annotations to define data models, allowing developers to establish structured schemas that automatically enforce business rules and constraints without the need for custom domain-specific languages. The library distinguishes itself by transforming high-level model definitions into optimized code during initialization to minimize runtime overhead. It supports recursive validation for nested data structures and employ

Swag is a documentation tool for Go that generates standardized API specification files by parsing declarative annotations within source code. It functions by analyzing source files to extract metadata from comments and function signatures, transforming them into machine-readable formats such as JSON or YAML. This process ensures that technical documentation remains synchronized with the underlying code structure throughout the development lifecycle. The tool distinguishes itself through its ability to perform static source code parsing and type-system reflection, which allows it to map compl

Showdoc is a technical documentation platform and knowledge management system designed to centralize project specifications, internal manuals, and technical guides. Built as a PHP web application, it provides a collaborative environment for teams to organize and share information across software development organizations. The platform distinguishes itself through its ability to automate documentation workflows by parsing source code comments and synchronizing technical records with the current state of a codebase. It also features specialized tools for managing RESTful API documentation and g

TypeSpec is a language for defining cloud API shapes and generating OpenAPI, JSON Schema, and client/server code from a single source of truth. It functions as a protocol-agnostic API designer that models REST, gRPC, and other API protocols using a unified, extensible syntax, with a decorator-based metadata system for attaching metadata, validation rules, and lifecycle visibility to API models and operations. The compiler produces OpenAPI 3.0 specifications and other artifacts, and the tool supports declaring API versions and tracking changes to models, properties, and operations across releas

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

APIStar is an OpenAPI framework providing a toolkit for building and verifying web APIs. It functions as an API schema validator, a traffic auditor, and a documentation generator to ensure compliance with API specifications and data types. The project converts OpenAPI and Swagger schemas into visual developer guides using customizable themes. It also implements a dynamic API client that adapts to defined schemas to send requests to remote servers. The framework includes capabilities for validating API schemas to identify structural mistakes and auditing incoming and outgoing web traffic agai

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

orpc is a contract-first API development framework for TypeScript that starts with a shared contract definition and generates type-safe clients and servers from that single source of truth. It guarantees end-to-end type safety, meaning inputs, outputs, errors, and streaming data are all checked at compile time across the client–server boundary. What distinguishes orpc from typical RPC frameworks is its ability to export contracts as OpenAPI specifications, to optimize server-side rendering by calling API handlers directly inside the server process, and to support real‑time bidirectional commu

json-to-go is a web-based tool for automatically generating Go structs from JSON input. It functions as a JSON to Go type generator, transforming unstructured JSON data or API responses into strongly typed source code structures. The project employs a WebAssembly-based translation engine to run the Go type generator directly within the browser. This architecture utilizes a schema-inference engine and recursive type mapping to analyze nested JSON objects and determine the appropriate Go data types for fields and arrays. The tool also includes utilities for API client development, allowing use