res.render for templates in Express - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does res.render() do in Express?

res.render() tells Express to use a template engine to create HTML from a template file and send it as a response to the browser.

beginner

How do you pass data to a template using res.render()?

You pass an object as the second argument to res.render(). The object contains key-value pairs that the template can use to show dynamic content.

beginner

What is the role of a template engine in res.render()?

A template engine takes a template file and data, then combines them to create HTML. res.render() uses this engine to build the final page sent to the user.

beginner

What happens if you call res.render('index') without passing data?

Express renders the index template with no extra data. The template will show static content or default values if coded that way.

intermediate

Can res.render() be used to render templates other than HTML?

Yes, depending on the template engine, res.render() can generate other text formats like XML or plain text, but HTML is the most common.

What is the first argument to res.render()?

A The name of the template file

B The data object

C The HTTP status code

D The response headers

The first argument is the template file name (without extension usually), telling Express which template to use.

How do you send dynamic data to a template in Express?

A By setting HTTP headers

B By calling <code>res.send()</code> before <code>res.render()</code>

C By passing an object as the second argument to <code>res.render()</code>

D By modifying the URL query string

Passing an object as the second argument to res.render() provides data for the template to use.

Which of these is NOT a common template engine used with Express?

A EJS

B ReactDOM

C Handlebars

D Pug

ReactDOM is for React rendering, not a template engine for Express.

What does res.render() send back to the client?

A Raw template file

B JSON data

C JavaScript code

D Rendered HTML content

res.render() sends the final HTML generated by the template engine.

If you forget to set a template engine in Express, what happens when you call res.render()?

A Express throws an error

B Express sends the template file as plain text

C Express ignores the call

D Express sends a 404 response

Express requires a template engine to render templates; otherwise, it throws an error.

Explain how res.render() works in Express and how you use it to send a web page.

Think about how Express combines a template and data to create a page.

Describe how you pass dynamic content to a template using res.render() and why this is useful.

Consider how websites show different info to different users.