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A collective list of free APIs for developers, including API clients and testing tools.
Main portal for the popular Jackson Java JSON library and ecosystem.
Open-source IDE for API exploration and testing
A desktop API client to organize and execute REST, GraphQL, WebSockets, SSE, and gRPC for vibe coders.
Python library for parsing Honkai: Star Rail data from Mihomo API
Open-source API development ecosystem for building, testing, and managing APIs
An API testing agent that generates tests, mocks, and stubs to help developers build better APIs.
A polyglot document intelligence framework with a Rust core for extracting text, metadata, and structured information from various file formats.
LLM API management & distribution system with unified API for multiple models
Turn websites into clean data pipelines & structured APIs in minutes with a low-code web scraping tool.
RSSHub delivers millions of contents aggregated from all kinds of sources
TypeScript-first schema validation with static type inference
A fluent API library for testing Node.js HTTP servers using Super Agent.
A PHP client library for accessing Google APIs, useful for building integrations with Google services.
A popular JavaScript HTTP client for Node.js and browsers, maintained by the ForwardEmail team.
Python library for downloading financial data from Yahoo! Finance
Gemini polling proxy service to interact with the Gemini cryptocurrency exchange API.
A TypeScript-based end-to-end testing framework for automating browser-based tests using Playwright.
A comprehensive Python library for building OAuth, OpenID Connect clients and servers with support for JWS, JWE, JWK, JWA, and JWT.
Scalar is an open-source API platform with a modern REST client, beautiful API references, and first-class OpenAPI/Swagger support.
Protocol Buffers for structured data serialization
A simple API that returns a random rejection reason for developers who need realistic excuses or fun 'no' responses.
Hurl is a Rust-based CLI tool for running and testing HTTP requests using a plain text format.
A collection of high-quality, open-source APIs for quick access to news, entertainment, and various data
A Python tool for downloading TikTok and Douyin content including videos, images, and metadata.
Bilibili API collection and documentation
A proxy server that can bypass Cloudflare protection for web scraping and other use cases.
Go-based SDK for interacting with the Space and Time API, a developer platform focused on AI tools.
DOClever is an open-source API management platform built with Node.js, Express, MongoDB, and Vue.js.
A curated list of public APIs for developers to discover and integrate into their projects.
A Python API to get YouTube video transcripts without an API key or headless browser
A modern, feature-rich API client that lives in your terminal, providing a seamless developer experience.
An open-source machine translation API that is self-hosted, offline-capable, and easy to set up.
An interactive GraphQL API visualization tool for developers to explore and document their APIs.
A low-boilerplate, object-capability RPC system for JavaScript/TypeScript developers.
A cross-platform, safe, pure-Rust graphics API for building high-performance, GPU-accelerated applications.
API client/server generator for OpenAPI specs
A PHP library that allows developers to easily extract metadata from any web service or page.
A type-safe error handling library for JavaScript and TypeScript projects.
A TypeScript library of custom GraphQL Scalars for building type-safe GraphQL schemas.
C++ SDK for QuipNetwork protocol integration and development
A TypeScript library for runtime type validation, optimized for editor-to-runtime performance.
A TypeScript hypermedia framework for building scalable and interoperable web applications.
Generate type-safe code from SQL for Go, Kotlin, Python, and other languages.
Open-source API client for debugging, designing, testing, and mocking APIs with cross-platform support and multiple storage options.
Automated CAPTCHA solver for your browser, supporting a wide range of CAPTCHA types.
A fully-featured, high-performance GraphQL server framework with a focus on easy setup and great developer experience.
A Python library that converts GeminiCLI and Antigravity to OpenAI, GEMINI, and Claude API interfaces.
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