Open-source alternatives to Swagger Typescript Api

The Swift OpenAPI Generator is a build-time tool that produces type-safe Swift client and server code directly from OpenAPI specification documents. By integrating with build systems through native plugins, it automates the creation of strongly-typed interfaces and protocol stubs that map network operations to native methods, ensuring that application code remains strictly consistent with defined data schemas. The project distinguishes itself through a protocol-oriented architecture that decouples business logic from specific transport implementations. It utilizes a pluggable transport layer

openapi-typescript is an OpenAPI TypeScript type generator and schema transformer. It converts JSON or YAML OpenAPI specification files into static TypeScript type definitions to provide end-to-end API type safety. The tool functions as a static type generator that transforms external API definitions into interfaces and types. It focuses on zero-runtime type enforcement, ensuring that data consistency is maintained via the TypeScript type system without adding overhead to production bundles. The project covers API type safety and schema conversion, facilitating the validation of request bodi

NSwag is an OpenAPI toolchain for .NET that provides a suite of generators for converting OpenAPI specifications and JSON schemas into clients, server stubs, and structured documentation. It enables the creation of type-safe client libraries and data transfer objects, as well as the generation of OpenAPI specifications by analyzing .NET controllers. The project supports contract-first API development by generating server controller stubs from specifications and offers dedicated TypeScript API integration to ensure type safety in frontend applications. It also provides tools for hosting intera

AutoRest is a multi-language SDK generator and OpenAPI code generator designed to produce consistent software development kits from a single API definition. It functions as a REST API client generator that transforms Swagger and OpenAPI specification files into functional, typed HTTP client libraries. The tool automates the SDK development workflow by converting design documents into source code, ensuring that the resulting implementations match the defined API contract across different programming languages. The system employs specification-driven development using an intermediate represent

This project is a type-safe GraphQL client generator and TypeScript schema compiler. It transforms GraphQL schema definitions and operation documents into static TypeScript types to ensure compile-time validation and data consistency between an API and a frontend application. The system functions as a customizable GraphQL plugin framework. It uses a plugin-based architecture and a custom pipeline to generate tailored API clients and request functions, eliminating the need for manual type declarations. The project covers GraphQL client automation, type generation, and workflow optimization. I

apollo-ios is a GraphQL client library for iOS and Apple platforms that enables type-safe network communication. It transforms GraphQL operations into generated Swift models, ensuring that network responses are validated at compile time to eliminate manual mapping. The library features a normalized cache manager that stores entities in a flat structure to maintain data consistency across different application views. It also optimizes network performance using hash-based persisted queries to reduce payload sizes and supports real-time data streaming via WebSockets or HTTP subscriptions. The p

graphql-request is a lightweight, type-safe GraphQL client library for JavaScript that runs across browsers, Node.js, and other JavaScript environments. It provides a minimal HTTP client for sending queries and mutations, with a promise-based execution model that uses the native fetch API for cross-runtime compatibility without additional dependencies. The client supports reusable selection set composition at runtime, allowing fragments to be shared across multiple requests to reduce duplication. It includes a plugin-based extension system for adding custom middleware, tracing, or file upload

Refit is a type-safe REST client for .NET that transforms API definitions into live interfaces. It functions as an automatic API proxy generator, allowing developers to define endpoints as interfaces to eliminate manual HTTP request boilerplate. The library is designed for compatibility with ahead-of-time compilation and trimmed binaries, utilizing build-time source generation to ensure support for native AoT deployments. The project covers a broad range of API integration capabilities, including attribute-driven request composition, automatic JSON deserialization, and request header managem

OpenAPI Generator CLI is a command-line utility designed to automate the creation of API artifacts from specification files. It functions as a tool for generating client libraries, server stubs, and documentation, enabling developers to produce consistent boilerplate code and reference materials across various programming languages. The project provides a wrapper that manages the lifecycle of a Java-based execution engine, which performs the actual code synthesis using logic-less templates. To ensure reproducible results and avoid dependency conflicts on the host system, the tool supports ver

go-swagger is a toolkit for working with Swagger/OpenAPI 2.0 specifications in Go. It generates server, client, and CLI code from a specification document, and can also produce a specification by scanning annotated Go source code. The project includes a static validation engine that checks documents against the schema and project-specific rules, and a specification transformation pipeline that resolves, flattens, and merges documents. The toolkit generates both client and server code from the same specification, ensuring consistency in request and response handling. It also produces a command

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

Wasp is a declarative full-stack web framework that enables developers to build and deploy applications by defining their architecture in a centralized configuration. By using a high-level specification, the framework automates the orchestration of frontend, backend, and database components, ensuring that infrastructure concerns like routing, authentication, and data modeling are handled consistently across the entire stack. The framework distinguishes itself through its compiler-driven approach, which translates declarative configurations into cohesive, production-ready codebases. It provide

Anchor is a framework for building, testing, and deploying Solana smart contracts. It provides a Rust domain-specific language (DSL) that uses macro‑based instruction dispatch and derive‑macro account validation to automate ownership checks, discriminator enforcement, and serialization before instruction execution. The framework also includes a CLI toolchain for scaffolding, compiling, and managing contracts across workspaces, a test harness that simulates program execution with account manipulation and compute unit benchmarking, and an IDL generator that emits a standardized JSON interface fr

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

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

oapi-codegen is a suite of generators that converts OpenAPI 3 specifications into type-safe Go client libraries, server boilerplate, and data models. It provides tools for producing production-ready HTTP clients and server-side interfaces to ensure that Go implementations remain compliant with defined API contracts. The tool supports server generation across various web frameworks and allows for extensive customization via template overrides, specification overlays, and custom type definition mappings. It handles complex API requirements through external reference resolution to organize code

CUE is a constraint-based configuration language designed for data validation, schema definition, and code generation. At its core, it unifies types and values into a single concept, enabling compile-time validation that catches structural and value errors before runtime. The language treats data and constraints as the same thing, allowing a single definition to serve as both a schema and concrete configuration data. CUE distinguishes itself through its constraint-based unification engine, which combines multiple configuration sources into a single coherent result by merging their constraints

MagicOnion is a remote procedure call framework for the .NET platform and Unity. It functions as a binary API protocol and real-time communication engine that uses shared interfaces to provide type-safe communication between clients and servers. The framework distinguishes itself through its compatibility with ahead-of-time compilation environments, utilizing source generators for client proxies and serialization to support mobile and console platforms including those using IL2CPP. It provides a specialized middleware layer for Unity that handles engine-specific data types and ensures runtime

Connect-go is a library for building type-safe remote procedure call services that are wire-compatible with gRPC and HTTP. It provides a Go implementation of Protocol Buffers for structured data exchange, enabling the creation of multi-protocol RPC servers and generated type-safe clients. The framework is distinguished by its polyglot protocol support, allowing a single server handler to serve requests using several different protocols simultaneously over HTTP. This includes the ability to toggle between different transport protocols for the same service and the use of pluggable content negot

Twirp is a Protocol Buffers RPC framework designed for implementing type-safe, distributed microservices communication over HTTP. It functions as a microservices communication framework and API code generator that produces strongly typed client stubs and server interfaces from schema definitions to eliminate manual network boilerplate. The framework ensures compatibility with existing web infrastructure by executing remote procedure calls over standard HTTP transport. It uses schema-driven contracts as a single source of truth to enable cross-language interoperability and decouple business lo

Moya is a network abstraction layer for Swift that provides a structured framework for defining and executing REST API requests. It functions as a type-safe API client that decouples network endpoint definitions from the underlying implementation details to prevent configuration errors and URL typos. The project distinguishes itself by using protocol-based endpoint definitions and a provider-coordinated execution model. It includes a system for mapping network responses to strongly typed objects and features a dedicated tool for generating type-safe network interface files from external REST

This project is a full-stack React starter kit and TypeScript web application boilerplate. It provides a pre-configured project template that combines a frontend and backend to accelerate the development of production-ready web applications. The kit is distinguished by its focus on type-safe architectures, utilizing a monorepo structure to synchronize data types between the server and client. It integrates specific implementations for SaaS operations, including recurring subscription billing via Stripe and user identity authentication supporting passkeys, social logins, and email verification

ServiceStack is a high-performance .NET web framework designed for building type-safe APIs using strongly-typed request and response objects. It functions as a message-based API engine that decouples business logic from the transport layer, allowing services to be exposed via multiple protocols including HTTP, gRPC, and various message queue providers. The framework is distinguished by its type-safe API generator, which produces native client SDKs and data transfer objects from service metadata across multiple languages. It also includes a distributed service gateway for microservices orchest

Amplication is a low-code API platform and backend service generator designed to accelerate the development of business domain services. It automates the creation of APIs and data models through schema-driven code generation, transforming structured definitions into executable backend source code. The platform functions as a developer portal orchestrator that establishes standardized workflows and golden paths for software delivery. It enforces organizational coding standards and best practices by applying live templates and predefined blueprints across all generated services. The system inc

TanStack Router is a type-safe routing library for web applications that provides full type safety for paths, search parameters, and data loaders across the entire application stack. It functions as a comprehensive framework for server-side rendering, enabling the generation of complete HTML pages to improve initial load performance and search engine optimization. By integrating declarative data fetching, the library manages asynchronous information at the route level, supporting preloading, caching, and parallel request execution to ensure data is ready before components render. The project

Zod is a TypeScript-first schema declaration and validation library designed to ensure end-to-end data integrity. It functions as a runtime type guard, allowing developers to define complex data structures through a declarative, chainable syntax. By using these schema definitions, the library automatically derives static TypeScript types, eliminating the need for manual type duplication and ensuring that runtime data matches expected application contracts. The library distinguishes itself through functional schema composition, which enables the creation of hierarchical structures by nesting a

Alova is a frontend data fetching library and HTTP request toolkit designed to manage remote data states and asynchronous communication in web applications. It functions as a request state management system that automates data retrieval, response caching, and synchronization between backend services and the user interface. The library distinguishes itself through a modular architecture that decouples network transport layers from request logic, allowing for consistent behavior across different environments. It utilizes a plugin-driven middleware system to extend core operations, enabling the