DummyJSON vs ItsThisForThat

DummyJSON is a free, keyless REST API that serves realistic placeholder data — products, carts, users, todos, recipes, quotes, posts, and comments — with full CRUD support on every resource (writes simulate success but nothing is persisted). Query parameters cover pagination (limit/skip), field selection, sorting, and full-text search, and a dedicated /auth flow issues real JWTs against its seeded users so frontend teams can exercise login and token-refresh flows without standing up a real backend.

ItsThisForThat is a single-endpoint novelty generator that mashes two random tech buzzwords into a startup-style "X for Y" pitch (e.g. "Google Analytics for Pandas"), served from a PHP script that's been running unchanged since at least 2018. The same api.php endpoint supports three output modes via query string — ?json for JSON, ?call=name for a JSONP callback, and ?text for a plain sentence — with no key, signup, or documented rate limit. There's no CORS header on any response, so browser code needs a same-origin proxy even though the endpoint itself is fully public.