This runs with npx.
Archives JTWC products gif, web (text warnings), and prog (prognostic reasonings).
npx jtwc-archiver
In the working directory, this will create a jtwc_products folder containing the archived products, along with the latest product. It will also create a jtwc.rss file used as a reference on whether or not new products will be downloaded.
If you're developing, you'll most likely generate the products in the same folder as the project files. Don't worry. I do that too. Just run npm run clean in case you want a clean workspace.
I'm not responsible for blocks to your IP or User Agent after DDoS attempts to the JTWC. Always use caution, don't request too often.
You are required to have a SOCKS5 proxy on port 51325. If you do not have a proxy, set the USE_PROXY constant to false in index.js.
Apache 2.0. Have fun.