WhatsApp has effectively replaced SMS in modern cross-platform text communications. While WhatsApp provides more and more advanced features (such as group video calls) that won’t likely work well on feature phones, its core remains in basic texting that feature phones can handle, but WhatsApp is not officially available on them.

For this reason, I decided to make a simple web-based proxy which works as follows:

1. It uses whatsapp-web.js to connect to WhatsApp. This unofficial library runs the official web client under the hood and allows applications to interact with it.
2. It exposes a primitive web chat application using the hapi framework. The application’s web user interface is super-limited, allowing even primitive web browsers such as Opera Mini to render it on feature phones.

Et voilà!