app.locals

app.locals

The app.locals object has properties that are local variables within the application.

app.locals.title
// => 'My App'

app.locals.email
// => 'me@myapp.com'

Once set, the value of app.locals properties persist throughout the life of the application, in contrast with res.locals properties that are valid only for the lifetime of the request.

You can access local variables in templates rendered within the application. This is useful for providing helper functions to templates, as well as application-level data. Local variables are available in middleware via req.app.locals (see req.app)

app.locals.title = 'My App';
app.locals.strftime = require('strftime');
app.locals.email = 'me@myapp.com';