$ show DIYgod/RSSHub
RSSHub is the world's largest open-source RSS feed generator, aggregating content from thousands of external websites into standardized RSS, Atom, JSON, and RSS3 feeds. It is a TypeScript application built on the Hono web framework, with a modular architecture where each source (news site, social platform, university notice board, government agency, etc.) is implemented as a self-contained 'route' module that fetches pages or APIs, parses HTML with Cheerio, and optionally renders rich descriptions using JSX. The project supports multiple deployment targets including Node.js, Docker, Vercel, and Cloudflare Workers, and integrates caching (Redis/LRU), middleware for access control, ETag/conditional requests, error tracking (Sentry, Honeybadger), and anti-hotlinking. The codebase is highly organized with consistent route definitions, extensive utility functions (date parsing, HTTP caching, header generation), and a strong emphasis on type safety. While the sheer volume of routes (thousands) introduces maintenance burden and some inconsistency (legacy `got` vs modern `ofetch`), the overall architecture is clean, well-tested for core infrastructure, and exhibits strong engineering practice. This is not a data-research repository; it is a production-grade web service for feed aggregation.
The LLM identified 3 files worth highlighting for reuse:
A pluggable cache abstraction that supports multiple backends (Redis, in-memory LRU) and provides a consistent interface for `get`, `set`, and `tryGet` operations with TTL support. It is used extensively across all routes to avoid redundant HTTP requests and can be extracted and reused in any TypeScript project requiring a simple cache layer with swap-able storage.
Hono middleware that sets standard HTTP headers (CORS, cache-control, ETag) and implements conditional GET requests by returning 304 Not Modified when the ETag matches. It demonstrates a robust pattern for optimizing API responses and can be dropped into any Hono-based service to improve caching and reduce bandwidth.
Utility that generates realistic browser-like HTTP headers (User-Agent, Accept, etc.) from configurable presets. This is a small, self-contained module that solves a common problem in web scraping projects—appearing as a normal browser to avoid anti-bot detection—and can be reused independently.