The problem Every new front‑end project hits the same wall: You need a place to drop files, but the back‑end isn’t ready. You don’t want to force users through a sign‑up flow just to test an upload. You spend 15‑20 minutes spinning up a temporary server (json‑server, Express, etc.), fiddling with CORS headers, status codes, and delays. That “setup ritual” eats valuable dev time and introduces fric