ctx.store(name, value?)

The app's in-memory store ($app.store()). Set with two arguments, read with one.

ctx.store('visits', (ctx.store('visits') || 0) + 1)

<p>Visits since start: <%= ctx.store('visits') %></p>

• Values are shared by every request to the app.
• The store lives in memory: it's empty again after the app restarts. Keep anything that must last in a collection.