npx web-push generate-vapid-keys
.env
VAPID_PUBLIC_KEY="BIN4-jnf6PK5yW395EElnHQlcQo49_oLD94Z7y630A_d1AmYOPcH5Ma0oDz4x46pu2uwX8xuoMdV2gDzTcG4I5A"
VAPID_PRIVATE_KEY="4IsYARu5F1nBwQ6W91b-pQAiJW_7bVezVQPMUH9Fft0"
VAPID_SUBJECT="mailto:test@test.test"
-[ ] change index.js accordingly
- Server Send events ... push to clients