Lohnt sich dein eigenes Animam.ai?

Build a website chat widget that answers strictly from a site's own content. Node 20 + TypeScript, no framework.

1. Install hono, @anthropic-ai/sdk, cheerio, turndown, better-sqlite3.
2. scripts/ingest.ts takes a sitemap.xml URL as argv and fetches every page, concurrency 4, skipping non-HTML.
3. Strip nav, header, footer and script tags with cheerio, then convert what is left to markdown with turndown.
4. Upsert into SQLite pages(url PRIMARY KEY, title, body, fetched_at) so re-running updates rows instead of duplicating them.
5. src/search.ts takes the 3 to 6 most distinctive words of the question and runs SELECT url, title, substr(body,1,1200) FROM pages WHERE body LIKE ? for each.
6. Rank by number of hits and return the top 5. No embeddings: under ~500 pages LIKE is cheaper, instant, and you can read why a passage was picked.
7. src/server.ts is a Hono app with POST /chat {message, sessionId}.
8. Put the 5 passages and their URLs in the system prompt, call claude-haiku with stream:true, and pipe SSE to the client.
9. System prompt: "Answer only from the CONTEXT below, and cite the page you used."
10. Continue it: "If the answer is not in the context, say you do not know and offer to take a message."
11. And the line that matters: "Never state a price, a date or an availability that is not written in the context."
12. public/widget.js is an IIFE that injects a bubble into a shadow DOM and keeps sessionId in localStorage.
13. It consumes the SSE and writes every message with textContent, never innerHTML · the text comes from a model that read the internet.
14. Store sessions and messages in the same SQLite file, so you can read back what people actually asked.
15. ANTHROPIC_API_KEY lives in .env, server-side only, and never reaches the bundle.
16. No telemetry, no third-party script in the widget.
17. Serve /widget.js with CORS * and a 5 minute cache so a single <script> tag installs it on any page.

Out of scope on purpose, and each of these is a week rather than a line: booking on a real calendar, payments,
quotes with amounts computed server-side, human handover, transactional email that reaches the inbox,
multi-tenancy, GDPR consent, rate limiting and abuse protection.