domain: apis
2838 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| openfga/openfga OpenFGA is a high-performance, open-source fine-grained authorization and permission engine inspired by Google's Zanzibar, owned by the CNC… | 99 | 5661 | stable |
| makenotion/notion-sdk-js The official JavaScript/TypeScript client library for the Notion REST API, published as @notionhq/client. It provides typed methods for que… | 98 | 5653 | stable |
| JakeChampion/fetch A JavaScript polyfill that implements a subset of the WHATWG Fetch specification, providing window.fetch() for browsers that lack native su… | 23 | 25859 | maintenance |
| serde-rs/json serde_json is the standard JSON serialization and deserialization library for Rust, built on the Serde framework. It converts between JSON … | 96 | 5631 | stable |
| sirupsen/logrus Logrus is a structured, pluggable logging library for Go, fully API-compatible with the standard library logger. It supports JSON, logfmt, … | 99 | 25750 | maintenance |
| serenity-rs/serenity Serenity is a Rust library for building Discord bots, providing a typed client for the Discord REST and gateway APIs. It transparently hand… | 74 | 5594 | active |
| Azure/azure-sdk-for-python The official Azure SDK for Python, a monorepo of client and management libraries for interacting with Azure services from Python. It includ… | 95 | 5593 | active |
| lukeed/polka Polka is an extremely minimal, high-performance Node.js web server library that serves as a faster, lighter alternative to Express.js. It p… | 41 | 5590 | stable |
| adamchainz/django-cors-headers A Django app that adds Cross-Origin Resource Sharing (CORS) headers to HTTP responses via middleware. It allows in-browser requests to a Dj… | 76 | 5587 | stable |
| sferik/x-cli A command-line power tool for Twitter/X that provides a full command tree for posting, searching, deleting, list management, and streaming … | 77 | 5583 | active |
| capcom6/android-sms-gateway An Android application that turns a smartphone into an SMS and MMS gateway, exposing a REST API for sending messages programmatically and w… | 95 | 5546 | active |
| expressjs/body-parser Node.js body parsing middleware for Express and Connect that parses incoming HTTP request bodies and populates req.body. It provides JSON, … | 93 | 5500 | stable |
| ServiceStack ServiceStack is a full-featured, message-based web services framework for .NET that lets you declare typed Request DTOs once and generate A… | 99 | 5498 | active |
| Swashbuckle Swashbuckle.AspNetCore is a library that generates OpenAPI (Swagger) documents for ASP.NET Core APIs directly from code, with an embedded S… | 96 | 5496 | stable |
| spotipy-dev/spotipy Spotipy is a lightweight Python client library for the Spotify Web API, providing access to all Spotify endpoints including music search, t… | 78 | 5468 | active |
| scribejava/scribejava ScribeJava is a simple, threadsafe OAuth client library for Java supporting OAuth 1.0a and OAuth 2.0 flows. It ships prebuilt API integrati… | 60 | 5455 | stable |
| rmosolgo/graphql-ruby graphql-ruby is a Ruby implementation of the GraphQL specification for building GraphQL server APIs in Ruby and Rails applications. It prov… | 67 | 5444 | stable |
| ardatan/graphql-tools GraphQL Tools is a TypeScript/JavaScript utility library for building, manipulating, mocking, and stitching GraphQL schemas using an SDL-fi… | 93 | 5432 | active |
| altair-graphql/altair Altair is a feature-rich GraphQL client IDE for running queries, mutations, and subscriptions, with schema documentation, environments, fil… | 98 | 5427 | active |
| unkeyed/unkey Unkey is an open-source, source-available developer platform for modern APIs that combines instant deployments, a globally distributed gate… | 92 | 5423 | active |
| h3js/h3 H3 is a minimal, high-performance HTTP server framework for TypeScript/JavaScript built on web standards. It is runtime-agnostic (Node.js, … | 98 | 5415 | active |
| oakserver/oak Oak is a middleware framework for handling HTTP requests, inspired by Koa and Express, with an included middleware router. It runs on Deno,… | 63 | 5410 | active |
| authlib/authlib Authlib is a Python library for building OAuth 1.0/2.0 and OpenID Connect clients, authorization servers, and protected resource servers, w… | 93 | 5406 | stable |
| ory/keto Ory Keto is an open-source authorization server implementing Google's Zanzibar model for scalable, low-latency permission checks. It suppor… | 80 | 5390 | active |
| googleapis/google-cloud-python The official monorepo of idiomatic Python client libraries for Google Cloud Platform services, covering APIs like BigQuery, Storage, AI Pla… | 95 | 5376 | stable |
| shidenggui/easyquotation A Python library for fetching free real-time stock quotes from Sina, Tencent (including Hong Kong stocks), and Jisilu. It retrieves full-ma… | 63 | 5372 | active |
| PokeAPI/pokeapi PokeAPI is a free, open-source RESTful (and beta GraphQL) API serving comprehensive Pokémon game data such as species, moves, abilities, ty… | 67 | 5357 | active |
| unjs/ofetch ofetch is an improved fetch API client library for JavaScript/TypeScript that works across Node, browsers, and workers. It adds smart JSON … | 83 | 5349 | active |
| novicezk/midjourney-proxy A Java-based proxy service that wraps MidJourney's Discord channel into a REST API, enabling programmatic AI image generation. It supports … | 45 | 5347 | active |
| google/gson Gson is a Java library for converting Java objects to JSON and back, working with arbitrary objects via reflection without requiring annota… | 88 | 24225 | maintenance |
| hey-api/hey-api Hey API is an ecosystem of code generators that turn OpenAPI specifications into production-ready SDKs, types, validators, and mocks. Its f… | 85 | 5316 | active |
| oomol-lab/open-connector OpenConnector is an open-source connector gateway that lets users authorize SaaS app accounts once and exposes 1,000+ providers and 10,000+… | 80 | 5316 | active |
| zircote/swagger-php A PHP library that generates OpenAPI (Swagger) documentation for RESTful APIs using PHP 8 attributes or legacy doctrine annotations embedde… | 95 | 5306 | active |
| dunglas/mercure Mercure is an open protocol (with an IETF Internet-Draft) for pushing real-time updates to browsers and HTTP clients over Server-Sent Event… | 90 | 5300 | stable |
| silenceper/wechat A simple and easy-to-use WeChat SDK for Go covering Official Accounts, Mini Programs, Mini Games, WeChat Pay, Open Platform, and WeCom (Ent… | 90 | 5293 | active |
| thinkjs/thinkjs ThinkJS is a Node.js web application framework that leverages full ES2015+ (ES6/7) features like async/await, with TypeScript support. It p… | 66 | 5268 | active |
| nikic/FastRoute FastRoute is a fast, regular expression-based HTTP request router library for PHP. It dispatches HTTP method and URI pairs to registered ha… | 64 | 5268 | stable |
| dherault/serverless-offline A Serverless Framework plugin that emulates AWS Lambda and API Gateway on your local machine. It starts an HTTP server that replicates the … | 97 | 5260 | active |
| typicode/jsonplaceholder JSONPlaceholder is a free online fake REST API for testing and prototyping, serving common resources like posts, comments, and users. It is… | 32 | 5244 | stable |
| openiddict/openiddict-core OpenIddict is a flexible OAuth 2.0/OpenID Connect framework for .NET, providing server, client, and token validation stacks. It supports st… | 97 | 5236 | stable |
| MapsterMapper/Mapster Mapster is a fast, convention-based object-to-object mapping library for .NET/C#. It supports mapping to new or existing objects, queryable… | 99 | 5163 | active |
| LuanRT/YouTube.js YouTube.js (youtubei.js) is a TypeScript client library for YouTube's internal InnerTube API, providing access to the same data and feature… | 98 | 5128 | active |
| rack/rack Rack is a minimal, modular Ruby library and specification that wraps HTTP requests and responses into a simple call, unifying the bridge be… | 82 | 5128 | stable |
| signalwire/freeswitch FreeSWITCH is an open-source software-defined telecom stack that turns commodity servers into a full telephony platform for voice, video, a… | 94 | 5118 | stable |
| emicklei/go-restful A Go package for building REST-style web services with explicit HTTP method routing and path parameter support. It provides configurable ro… | 65 | 5116 | stable |
| loopbackio/loopback-next LoopBack 4 is a highly extensible Node.js and TypeScript framework for building REST APIs and microservices, driven by OpenAPI specificatio… | 77 | 5107 | active |
| su-kaka/gcli2api A self-hosted Python service that converts GeminiCLI and Antigravity into OpenAI-, Gemini-, and Claude-compatible API endpoints. It can be … | 62 | 5100 | active |
| mislav/hub hub is a command-line tool that wraps git to add GitHub-specific features like cloning, creating repositories, forking, and submitting pull… | 23 | 22957 | maintenance |
| looplj/axonhub AxonHub is an open-source AI gateway written in Go that lets any SDK call 100+ LLMs through a unified API. It provides built-in failover, l… | 79 | 5078 | active |
| stoplightio/prism Prism is an open-source CLI tool that turns OpenAPI v2/v3 documents or Postman Collections into a fully functional HTTP mock server with dy… | 97 | 5016 | active |
| python-jsonschema/jsonschema A Python library implementing the JSON Schema specification for validating JSON data against schemas. It supports all major JSON Schema dra… | 83 | 4977 | stable |
| googlemaps/google-maps-services-python The official Python client library for Google Maps Platform Web Services, covering Directions, Distance Matrix, Elevation, Geocoding, Geolo… | 64 | 4973 | stable |
| protobuf-net/protobuf-net protobuf-net is a contract-based serializer for .NET that writes data in Google's Protocol Buffers wire format using idiomatic .NET pattern… | 99 | 4968 | stable |
| apple/swift-protobuf Apple's Swift Protobuf provides a protoc plugin for generating Swift code from .proto files plus the runtime library needed to use that gen… | 96 | 4960 | stable |
| slack-go/slack A Go client library covering most of the Slack Web API (api.slack.com) plus real-time messaging via WebSocket, Socket Mode, and the Events … | 99 | 4958 | active |
| CrowCpp/Crow Crow is a fast, header-only C++ microframework for building HTTP and WebSocket web services, with Flask-style routing and type-safe handler… | 88 | 4956 | active |
| mock-server/mockserver-monorepo MockServer is an open-source HTTP(S) mock server and proxy for testing that can mock APIs, record and inspect live traffic, and inject fail… | 99 | 4953 | active |
| apache/dubbo-go Apache Dubbo-go is the official Go implementation of the Apache Dubbo microservice framework, providing high-performance RPC with service d… | 98 | 4953 | active |
| FxEmbed/FxEmbed FxEmbed is a Cloudflare Worker service that powers FxTwitter, FixupX, and FxBluesky, rewriting X/Twitter and Bluesky links into rich embeds… | 77 | 4948 | active |
| mailru/easyjson easy is a fast JSON serializer for Go that generates marshaler/unmarshaler code for structs via a CLI code generator, avoiding reflection. … | 70 | 4915 | stable |
| spring-cloud/spring-cloud-gateway Spring Cloud Gateway is an API gateway built on Spring Framework, Spring Boot, and Project Reactor. It provides routing, filtering, and tra… | 99 | 4904 | stable |
| RomelTorres/alpha_vantage A Python wrapper library for the Alpha Vantage API providing access to stock, cryptocurrency, forex, fundamental, technical indicator, and … | 65 | 4898 | active |
| aipotheosis-labs/aci ACI.dev is an open-source tool-calling platform that connects 600+ SaaS tools to AI agents and agentic IDEs via direct function calling or … | 62 | 4885 | active |
| imroc/req Req is a simple yet powerful Go HTTP client library with chainable APIs, supporting HTTP/1.1, HTTP/2, and HTTP/3. It offers built-in debugg… | 98 | 4853 | active |
| goravel/goravel Goravel is a full-featured, modular web application framework for Go, styled after Laravel so PHP developers can build Golang applications … | 93 | 4818 | active |
| ZijianHe/koa-router koa-router is Express-style routing middleware for the Koa web framework, supporting named parameters, nested routers, and async/await. It … | 54 | 4814 | stable |
| Integuru-AI/Integuru Integuru is an AI agent that reverse-engineers platforms' internal APIs by analyzing browser network requests (HAR files) and building depe… | 62 | 4760 | active |
| graph-gophers/graphql-go A GraphQL server library for Go focused on ease of use, with schema parsing, type-checked resolvers, and an HTTP relay handler. It supports… | 93 | 4759 | active |
| easy-swoole/easyswoole EasySwoole is a high-performance, persistent-memory PHP framework built on the Swoole extension, designed for building coroutine-based APIs… | 70 | 4758 | active |
| tokio-rs/prost prost is a Protocol Buffers implementation for Rust that generates simple, idiomatic Rust types from proto2 and proto3 files. It supports s… | 89 | 4749 | stable |
| googleworkspace/md2googleslides A Node.js command-line tool that converts Markdown and HTML into Google Slides decks via the Google Slides API. It supports CommonMark/GFM … | 10 | 4729 | active |
| webonyx/graphql-php A feature-complete PHP implementation of the GraphQL specification, based on the JavaScript reference implementation. It provides type syst… | 95 | 4718 | stable |
| strawberry-graphql/strawberry Strawberry is a developer-friendly GraphQL library for Python built on dataclasses and type hints. It lets you define GraphQL schemas with … | 94 | 4706 | active |
| AgnesAI-Labs/AgnesAI-Models Official gateway and model catalog for Agnes AI, providing OpenAI-compatible API access to multimodal foundation models covering text, imag… | 58 | 4705 | active |
| aldinokemal/go-whatsapp-web-multidevice GoWA is a self-hosted WhatsApp REST API service written in Go, exposing WhatsApp multi-device messaging over HTTP with a web UI, webhooks, … | 95 | 4684 | active |
| discord-jda/JDA JDA (Java Discord API) is a Java library for building Discord bots, wrapping Discord's real-time WebSocket gateway and REST API behind an e… | 97 | 4681 | active |
| xxnuo/MTranServer MTranServer is an offline machine translation server with very low resource usage and millisecond response times, requiring no GPU. It supp… | 66 | 4675 | active |
| d60/twikit Twikit is a free Python library that wraps Twitter's internal API, allowing posting, searching, and scraping tweets without an official API… | 60 | 4631 | active |
| mholt/json-to-go A tool that instantly converts JSON into Go type (struct) definitions, available as a browser-based web tool and a Node.js script. It is a … | 32 | 4627 | stable |
| prest/prest pRESTd is a production-ready Go service that exposes instant REST APIs (and a read-only MCP endpoint) on top of any existing or new Postgre… | 98 | 4611 | stable |
| spec-first/connexion Connexion is a Python web framework for spec-first (API-first) development, where the API is described in an OpenAPI/Swagger specification … | 81 | 4611 | active |
| xiaoymin/knife4j Knife4j is an all-in-one enhancement solution for Swagger2 (OpenAPI2) and OpenAPI3 in the Java/Spring ecosystem, providing an improved API … | 52 | 4577 | active |
| NdoleStudio/httpsms httpSMS is a service that turns an Android phone into an SMS gateway, letting you send and receive SMS messages programmatically via a simp… | 95 | 4569 | active |
| agentgateway/agentgateway Agentgateway is an open-source, Rust-based proxy and gateway for agentic AI traffic, handling LLM provider routing, MCP tool servers, and A… | 81 | 4563 | active |
| cerbos/cerbos Cerbos is an open-core, language-agnostic policy decision point (PDP) that externalizes authorization from application code using context-a… | 94 | 4555 | stable |
| CLI Printing Press A Go-based CLI generator that studies official API docs, community CLIs, MCP servers, and undocumented web APIs to produce token-efficient,… | 77 | 4550 | active |
| emissary-ingress/emissary Emissary-ingress is an open-source, Kubernetes-native API gateway, Layer 7 load balancer, and Kubernetes Ingress built on Envoy Proxy. It i… | 86 | 4519 | stable |
| apache/fory Apache Fory is a blazingly fast multi-language serialization framework supporting idiomatic domain objects, a reference-aware schema IDL, a… | 96 | 4515 | active |
| typestack/routing-controllers A TypeScript framework for building structured, declarative class-based controllers with decorators on top of Express or Koa. It handles ro… | 72 | 4504 | stable |
| googleapis/google-cloud-go The official Google Cloud Client Libraries for Go, providing idiomatic Go packages for accessing Google Cloud Platform services such as Sto… | 95 | 4499 | active |
| uber-go/dig dig is a reflection-based dependency injection toolkit for Go that resolves object graphs at process startup. It is designed to power appli… | 39 | 4497 | stable |
| Stripe The official Stripe Node.js library providing convenient, typed access to the Stripe API from server-side JavaScript and TypeScript applica… | 99 | 4493 | stable |
| spatie/laravel-query-builder A Laravel package that builds Eloquent queries from API request parameters, supporting filtering, sorting, field selection, and relationshi… | 97 | 4465 | stable |
| flexprice/flexprice Flexprice is an open-source usage-based pricing and billing platform for developers, offering real-time usage metering, credits and wallets… | 84 | 4453 | active |
| Cysharp/MagicOnion MagicOnion is a unified RPC and real-time communication framework for .NET and Unity, built on gRPC and MessagePack. It uses C# interfaces … | 96 | 4441 | active |
| poem-web/poem Poem is a full-featured, easy-to-use web framework for Rust built on async/await, with crates for OpenAPI, gRPC, AWS Lambda, and MCP server… | 66 | 4434 | active |
| salvo-rs/salvo Salvo is a powerful yet simple async web framework for Rust, built on Hyper and Tokio. It offers tree-based routing, unified handler/middle… | 99 | 4432 | active |
| tdlib/telegram-bot-api An open-source C++ server that implements the Telegram Bot API as an HTTP service, built on TDLib. It can be self-hosted to run bots agains… | 77 | 4431 | active |
| square/wire Wire is Square's protocol buffer (protobuf) library with gRPC support for Kotlin, Java, Swift, and Android. It generates lightweight, idiom… | 77 | 4428 | active |
| rails/jbuilder Jbuilder is a Ruby gem providing a simple Builder-style DSL for declaring JSON structures, commonly used in Rails views via ..jbuilder temp… | 80 | 4420 | stable |