6.0.0

API

API v6.0.0 — Identifiers out of URLs, v1–v3 retired, rate limit headers.

GET /captcha now answers in challenge mode by default: the image comes with a signed token instead of the answer in clear, and its rendering is hardened against automated reading. The historical generator stays available through ?mode=image, for anyone who needs to read the answer server-side.
Versions v1, v2 and v3 are retired, along with all the untyped JavaScript they shared. The API now serves only v4, v5 and v6 — install @20syldev/api@5.9.0 if you still need an older one.
POST /levenshtein moves from GET to POST: the two strings being compared no longer travel in the URL, and therefore no longer through browser history or the logs of any intermediary.
Sensitive identifiers leave the URL: DELETE /chat/:token becomes POST /chat/clear, and PATCH/DELETE /tic-tac-toe/:game become POST /tic-tac-toe/play and POST /tic-tac-toe/forfeit. The PATCH and DELETE methods disappear from the API entirely.
Error responses now return status as a number rather than a string.
Every response now carries the X-RateLimit-Limit, X-RateLimit-Remaining and X-RateLimit-Reset headers, and a Retry-After accompanies a 429 refusal — a client can finally pace itself instead of discovering its limit by hitting it.
POST /hyperplanning is deprecated: it keeps working on every version, but v6 no longer lists it among its available endpoints. It will be removed for good in 7.0.0.

Added the v6 documentation, in English and French, with its own sidebar, version switcher entry and changelog.
Rewrote the pages of the four endpoints whose method or path changed, each carrying a callout explaining what moved and why.
Documented the new rate limit headers on the Authentication page, and flagged the status type change on Getting Started.
Sidebar and Playground no longer offer PATCH or DELETE anywhere in v6, and the endpoint registry now describes per-version differences so v4 and v5 keep showing their own methods.
Pages for v1, v2 and v3 now carry a banner stating the API no longer serves them.
Moved the paid plans to Patreon and updated their prices.