Open-source alternatives to Openapi Ts

Wretch is a chainable HTTP client library and Fetch API wrapper designed to simplify network request configuration, response parsing, and error handling. It functions as a network request manager and middleware framework for managing the end-to-end lifecycle of HTTP calls. The project is distinguished by a fluent interface for request configuration and a modular extension system. It utilizes a programmable response resolver to automate parsing and a plugin-based architecture to add new capabilities to request and response objects. The library covers a broad range of operational capabilities,

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

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

Axios is an isomorphic, promise-based HTTP client designed for making asynchronous network requests across different JavaScript execution environments, including the browser and Node.js. It functions as a JSON API client that serializes JavaScript objects into JSON and parses server responses into structured data. The project features a system for managing reusable client instances with shared configurations, such as base URLs and default settings. It includes a mechanism for intercepting outgoing requests and incoming responses globally, allowing data to be transformed before it reaches the

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

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

yapi is an API management platform designed to coordinate the development of RESTful APIs between frontend, backend, and quality assurance teams. It functions as a centralized system for documenting interface specifications, simulating server responses, and validating requests through a built-in testing client. The platform features an API code generator that transforms interface specifications into typed request functions and data models across multiple programming languages. It also includes a mock server capable of generating synthetic responses using schema-based generators and rule-based

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

This project is a collection of Go packages and a programmatic interface for interacting with Google services and Google Cloud resources via REST APIs. It functions as a client library and SDK that transforms raw HTTP requests into structured Go function calls. The library utilizes discovery-based client generation to create type-safe clients from API discovery documents. It separates the acquisition of authorization tokens from the request logic through a token-source based authentication model. The project covers identity management and authentication via OAuth 2.0, service accounts, and A

Primus is a real-time communication abstraction layer and middleware framework. It provides a standardized interface for messaging that allows developers to switch between different transport engines without rewriting application logic, while also serving as a wrapper for managing socket lifecycles. The project distinguishes itself by functioning as a real-time client library generator, producing compatible client-side code based on server configurations. It further organizes data flow through virtual stream multiplexing and the ability to group connections into named communication rooms for

Kitex is a high-performance remote procedure call framework for building distributed microservices in Go. It provides a communication system compatible with gRPC and Protobuf standards and includes a suite of tools for microservices governance. The framework features proxyless service mesh integration, which allows it to manage network traffic and governance directly without adding sidecar proxy latency. It optimizes data throughput through a high-performance communication library that minimizes memory copies. The system covers a broad surface of distributed capabilities, including service d

Got is a promise-based HTTP request library for Node.js that supports HTTP/2 and streaming. It provides a system for making network requests with a focus on asynchronous control flow and type-safe API client development. The library is distinguished by its middleware-based request lifecycle, which uses interceptors and plugins to modify request options and response data. It includes a configurable automatic retry mechanism with backoff strategies, a built-in HTTP response cache, and a cookie-jar system for maintaining persistent sessions. Broad capabilities cover data handling through duplex

Hertz is a high-performance Go HTTP framework designed for building scalable microservices, RESTful APIs, and AI applications. It functions as a high-performance web server and a communication framework for microservices, utilizing non-blocking I/O and zero-copy memory management to handle high-concurrency traffic. The project distinguishes itself through a microservices communication toolkit that supports high-efficiency remote procedure calls via gRPC and Thrift protocols. It implements an asynchronous middleware engine based on an onion model, allowing for a pluggable request-response pipe

Apollo Client is a frontend GraphQL integration layer and client library used to fetch, manage, and cache data from a GraphQL server in web and mobile applications. It functions as a state management framework that synchronizes remote server data with local application state. The project provides a TypeScript wrapper for executing GraphQL queries and mutations, ensuring type-safe API integration with automatic validation and code completion. The library manages data fetching and synchronization between the backend and the user interface. It includes capabilities for caching GraphQL results l

This project is a command-line tool that automates the creation of type-safe TypeScript HTTP clients directly from OpenAPI specifications. By transforming service definitions into structured source code, it ensures end-to-end type synchronization and enforces runtime data integrity across network boundaries. The generator distinguishes itself by mapping OpenAPI data structures into Zod validation schemas, allowing for consistent schema-driven type mapping and response validation. It supports deduplicated source synthesis to minimize redundancy in the generated output and provides template cus

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

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

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

This project is a command-line schema-to-code converter designed to transform diverse data specifications into type-safe Python data structures. It functions as a generator for Pydantic models, dataclasses, and typed dictionaries, enabling developers to maintain synchronization between evolving data contracts and application code. By parsing formats such as JSON Schema, OpenAPI, AsyncAPI, Protobuf, and Avro, the tool automates the creation of native classes that reflect the constraints and metadata defined in the source specifications. The generator distinguishes itself through a highly confi

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

urql is a GraphQL client and data management tool used to execute GraphQL operations and synchronize data from remote servers within a software application. It functions as a mechanism for fetching, caching, and managing GraphQL data to maintain state across application views. The project features a pluggable middleware architecture and a normalized GraphQL cache. This allows for the insertion of custom logic into the request and response lifecycle to modify client behavior and the organization of responses by unique identifiers to ensure data consistency. The client provides capabilities fo

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

Superagent is a cross-platform JavaScript HTTP client and Ajax library used for exchanging data between clients and servers. It provides a consistent API for making network requests that works identically across both Node.js and web browser environments. The library features a request pipeline that allows for the addition of custom behaviors to outgoing network calls. This system supports the implementation of specialized functions such as request throttling, caching, and the automatic signing of outgoing data.

Kit is a microservices architectural framework and toolkit for Go. It provides a set of standardized primitives and abstractions for implementing service, endpoint, and transport layers in a decoupled manner. The framework focuses on system instrumentation through integrated distributed request tracing and a service instrumentation toolkit that utilizes counters and gauges to export performance data to external monitoring backends. It includes a structured logging library that records system events as key-value pairs to ensure compatibility with log aggregation tools. The project covers a br

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

node-fetch is a lightweight HTTP client library that implements the browser-standard Fetch API for Node.js. It provides a promise-based interface for making asynchronous network requests to retrieve or send data from server-side environments. The project specializes in memory-efficient data handling by utilizing request and response streaming. This allows for the incremental processing of large network payloads through native system streams to prevent memory exhaustion. The library covers a broad range of networking capabilities, including the use of custom HTTP agents for DNS and SSL config

Lura is an API gateway and traffic router that directs network requests to backend services using a configurable pipeline of processing steps. It functions as a backend load balancer and a request middleware engine designed to validate, modify, and transform incoming requests and responses. The system specializes in API response aggregation, allowing it to execute concurrent requests to multiple backend services and merge the results into a single unified output. This includes the ability to perform dynamic response mapping by renaming fields and filtering data to optimize the final client pa