CDNJS vs Wandbox

cdnjs mirrors thousands of open-source JavaScript, CSS, and font libraries on Cloudflare's edge network, and its free `/libraries` and `/libraries/:library` endpoints expose the same catalogue as JSON — name, latest version, file list, SRI hashes, and linked GitHub metadata — backed by Algolia search. No key or signup is required for either the asset CDN or the metadata API, and responses cache for six hours server-side.

Wandbox is a free "social compilation service" built by melpon and kikairoya, offering 175 compiler configurations across 35 languages — from mainstream C++, Python, Rust, and Go to niche picks like Lazy K and Pony — including nightly HEAD builds of GCC and Clang. Its REST API needs no key: POST source code, a compiler ID, and options to /api/compile.json (or the /ndjson variant for streamed output) and get back compile/runtime output plus a permanent shareable permalink, while /api/list.json enumerates every compiler and its supported switches. The project was rewritten in 2024–2026 from a legacy Ruby backend to Rust (feline) and Remix (canine), which is why the old kennel2/API.rst docs path 404s — the live API endpoints themselves are unchanged.