Open Source Packages
Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.
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jest
Delightful JavaScript testing with zero-config setup, snapshots, mocking, and coverage
testify
The essential Go toolkit for assertions, mocks, and structured test suites.
MSW (Mock Service Worker)
Seamless REST and GraphQL API mocking for browser and Node.js
proxy-agent
Maps HTTP, HTTPS, SOCKS, and PAC proxy protocols to the correct Node.js http.Agent implementation automatically.
@slack/web-api
Slack's official Node.js HTTP client for calling any of the 270+ Web API methods, with built-in queuing, retries, pagination, and rate-limit handling.
identity-obj-proxy
An ES6 Proxy that echoes back every key you access, built to mock CSS Modules and other webpack style imports in Jest tests.
http-proxy-middleware
The one-liner Node.js proxy middleware for connect, express, next.js, hono, and more.
wrapt
A Python module for building correct decorators, transparent object proxies, and safe monkey patching.
verdaccio
A lightweight, zero-config-required private npm registry with built-in caching and proxying of public registries.
proxy-from-env
Resolves the correct proxy URL for a request by reading standard *_PROXY and NO_PROXY environment variables
mockall
A powerful mock object library for Rust unit testing.
gock
Versatile HTTP traffic mocking for Go, intercepting any net/http-based client for deterministic tests.
socks
Fully featured SOCKS proxy client for Node.js supporting SOCKS v4, v4a, and v5 with bind and UDP associate
proxy-addr
Determine the real client IP address behind trusted proxies, with full IPv4, IPv6, and CIDR support.
valtio
Proxy-based state management for React and vanilla JavaScript with automatic render optimization.