Express JS Express Template Engines 3

Question 1

What is the primary purpose of view caching in Express?

Accepted Answer

Storing compiled templates in memory to avoid recompilation on every request

Answer

View caching keeps compiled templates in memory so Express skips re-reading and re-parsing the template file on subsequent requests.

Question 2

How can view caching be enabled in Express?

Accepted Answer

Either app.set('view cache', true) or app.enable('view cache')

Answer

Both app.set('view cache', true) and app.enable('view cache') are equivalent ways to enable view caching; Express enables it automatically when NODE_ENV is 'production'.

Question 3

In Pug templates, which keyword includes another Pug file into the current template?

Accepted Answer

include

Answer

The 'include' keyword in Pug inserts the contents of another template file at that position, enabling template composition.

Question 4

What benefit does setting a default 'view engine' provide in Express?

Accepted Answer

Removes the need to specify file extensions in res.render() calls

Answer

With a default view engine set, res.render('index') resolves to 'index.ejs' (or the configured extension) without requiring the caller to include the extension.

Question 5

Which object's properties are automatically merged and available as local variables in all rendered templates?

Accepted Answer

app.locals

Answer

app.locals properties are merged with res.locals before template rendering, making them globally available across all views in the application.

Express JS Practice Test

Express JS Practice Test

Express JS Express Template Engines 3