English Random Words vs TotalShiftLeft Sandbox

English Random Words is a small keyless REST API that returns one random English word per request, each response bundled with its dictionary definition and an approximate pronunciation spelling. Its OpenAPI spec (browsable at /api-docs) also lists per-language routes for Spanish, French, Dutch, Japanese, Chinese, and Turkish, though a live probe found every one of those still answers "Language not supported yet" — only the English endpoint actually works. Hosted on Vercel with no signup or paid tier, it enforces a modest 30-requests-per-15-minutes rate limit per client.

TotalShiftLeft's Sandbox (self-titled "API Learning Sandbox") is a free hands-on playground for practicing REST, GraphQL, and SOAP against the same underlying data store — a session is auto-created on first request (no signup) and seeded with demo users, products, and orders that expire after 30 minutes. Beyond plain access, it supports three optional auth flows for testing auth code paths: an x-api-key header, a JWT obtained from POST /auth/token, and an OAuth2 client-credentials exchange at POST /auth/oauth. Query params let callers simulate real-world conditions — added latency, forced error codes, or random failures — making it a fixture for testing API client resilience rather than just CRUD happy paths.