LUN Scraper Bot — Telegram bot · web scraper

Cloudflare Worker that checks saved LUN.ua rental searches every 5 minutes and posts each new apartment to its own Telegram forum topic.

Role: Author

Client: Personal tool for apartment hunting

Team: Solo

Period: 2026

Good rental flats in Kyiv are often taken quickly, so reacting early matters. LUN.ua aggregates listings from many sources but has no public API, and watching several narrow searches — specific microdistricts, satellite towns, price and area limits, flats or houses — meant refreshing pages all day. The goal was a bot that watches every saved search, spots genuinely new listings within minutes and sends them with photos and a map link to a shared group.

I wrote it as a Cloudflare Worker on a 5-minute cron. LUN pages are rendered by Next.js, so the scraper reassembles the React Server Component flight chunks and parses full listing cards — price, rooms, area, floor, address, metro, phones — paging until results run out. Searches live in JSON, with microdistricts and towns resolved to LUN geo ids. Seen ids are stored per search in Workers KV; the first run is a silent baseline. A dependency-free Node script exports the data to JSON and CSV.

Searches in JSON: microdistricts, towns, price, area, flats or houses

Parses Next.js flight data instead of fragile page HTML

Per-search deduplication in KV; silent baseline on the first run

Telegram forum topic per search, created and renamed automatically

Photo album with listing and map buttons; 429-aware pacing

Running since August 2026 on a 5-minute schedule; 16 commits

JavaScript, Cloudflare Workers, Cron Triggers, Workers KV, Telegram Bot API, Node.js, Wrangler