ISBN Reader
Live: https://oleprota.github.io/isbn-scanner/ (https, so the camera works on a phone)
The interface is in Ukrainian. Minimal page: enter or scan an ISBN and get a card with two buttons (the site icons) that look the book up on Ereadian and Goodreads. A book is shown as ISBN <number> unless you name it (tap the title on its card) or the optional lookup service finds its name and cover on Goodreads (see worker/README.md; the app works fully without it).
Every ISBN you search or scan goes into the Шукане ("Scanned") list. Press the ☆ on a card or in that list to put a book into the Вибране ("Marked") list (a shopping companion); each list holds up to 1000 books and can be copied as text. A full list refuses new books and says so: clear it (or unmark some) to add more. Both lists, typed names and settings are kept in your browser (localStorage).
Press Scan to read the ISBN from a book's barcode with the camera (needs camera permission and localhost or https); tap it to scan one book, or hold it for a moment (it fills with red) to keep the camera on for several books until you press Stop. A beep and a flash confirm each read (amber for a new book, blue for one already scanned). Typing the ISBN always works too.
Usage counts. The app sends anonymous usage counts to the same lookup service (POST /event, kept in a small D1 database, see worker/README.md): which browser and device kind, whether the camera worked and how long a scan took, how the lookup answered, which features were used. Never an ISBN, title or name. Your browser gets a random id (shown at the bottom of the page) to count returning visitors; nothing else identifies you. A browser that sends Do Not Track sends nothing. The developer's own use is flagged by opening the page once with #dev (#nodev undoes it), so it can be left out of the counts.
Run
ES modules don't load over file://, so use a static server:
python3 -m http.server 8000
Then open http://localhost:8000.
Test
npm test
