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Crawlee—A web scraping and browser automation library for Node.js to build reliable crawlers. In JavaScript and TypeScript. Extract data for AI, LLMs, RAG, or GPTs. Download HTML, PDF, JPG, PNG, and other files from websites. Works with Puppeteer, Playwright, Cheerio, JSDOM, and raw HTTP. Both headful and headless mode. With proxy rotation.
:alarm_clock: :fire: A TCP proxy to simulate network and system conditions for chaos and resiliency testing
WebDriver Classic proxy for automating Firefox through Marionette
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.
cglib - Byte Code Generation Library is high level API to generate and transform Java byte code. It is used by AOP, testing, data access frameworks to generate dynamic proxy objects and intercept field access.
Fortio load testing library, command line tool, advanced echo server and web UI in go (golang). Allows to specify a set query-per-second load and record latency histograms and other useful stats.
🔮 Proxies nodejs require in order to allow overriding dependencies during testing.
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers
Chaos engineering tool for simulating real-world distributed system failures
A free, open-source alternative to Burp Suite: an intercepting proxy and web app security testing suite with Repeater, Intruder, Collaborator and a built-in OWASP ZAP scanner. Linux, AGPL-3.0.
In-page HTTP controller for frontend development. Intercept, modify, and simulate API responses directly in the browser.
PETEP (PEnetration TEsting Proxy) is an open-source Java application for traffic analysis & modification using TCP/UDP proxies. PETEP is a useful tool for performing penetration tests of applications with various application protocols. ⚡
HTTP mock for Golang: record and replay HTTP/HTTPS interactions for offline testing
Simplify software testing, by easily mocking any system using HTTP/HTTPS, allowing a team to test and develop against a service that is not complete or is unstable or just to reproduce planned/edge cases.
Java binding for Hoverfly
A Cloudflare worker script used to enable a/b testing, canary releasing, gatekeeping, and SEO a/b/n testing.
ToxiproxyEx is an Elixir API client for the resilience testing tool Toxiproxy.
localaik is a local compatibility server for a subset of the Gemini and OpenAI APIs. Run one container locally, point your SDK to it, and the proxy serves both protocol shapes on the same port for tests and development.