What number of active users used the application within this project?

The number of active users of the application depends on the specific project and time period. Usually, to count active users, metrics like DAU (Daily Active Users) — the number of unique users per day, and MAU (Monthly Active Users) — per month are used. Within a project, this number can be obtained from analytics systems such as Google Analytics, Firebase, or a proprietary database where user sessions are recorded.

If it is about a Node.js project, then to count active users, you can implement storage of unique user identifiers with timestamps of their activity and then aggregate this data. For example, count the number of unique userIds that performed actions in the last 24 hours.