Why SSR matters for Vue - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic Vue app instance.

Vue

const app = Vue.[1]({
  data() {
    return { message: 'Hello SSR!' };
  }
});

Drag options to blanks, or click blank then click option'

AcreateApp

BmountApp

CnewApp

DinitApp

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'mountApp' instead of 'createApp'

Trying to use 'newApp' which is not a Vue function

Vue apps are created using createApp. This sets up the app instance.

2fill in blank

medium

Complete the code to mount the Vue app to the DOM.

Vue

app.[1]('#app');

Drag options to blanks, or click blank then click option'

Aattach

Brender

Cstart

Dmount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'render' which is for rendering components, not mounting

Using 'attach' which is not a Vue method

The mount method attaches the Vue app to a DOM element.

3fill in blank

hard

Fix the error in the server entry file to enable SSR rendering.

Vue

import App from './App.vue';

export function createApp() {
  const app = [1](App);
  return { app };
}

Drag options to blanks, or click blank then click option'

AcreateSSRApp

BstartSSR

CmountApp

DrenderToString

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'createApp' which is for client-side only

Using 'renderToString' as a function name here

For SSR, Vue provides createSSRApp to create the app instance suitable for server rendering.

4fill in blank

hard

Fill both blanks to complete the Vue SSR server setup.

Vue

import { [1] } from 'vue/server-renderer';
import { createSSRApp } from 'vue';

export async function render(url) {
  const app = createSSRApp({ /* root component */ });
  const html = await [2](app);
  return html;
}

Drag options to blanks, or click blank then click option'

ArenderToString

BrenderToStaticMarkup

CrenderToDom

DrenderApp

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'renderToDom' which is client-side only

Using different functions for import and call

renderToString from vue/server-renderer converts the app to HTML string for SSR.

5fill in blank

hard

Fill all three blanks to complete a Vue SSR hydration example.

Vue

import { [1] } from 'vue';
import App from './App.vue';

const app = [2](App);
app.[3]('#app');

Drag options to blanks, or click blank then click option'

AcreateSSRApp

BcreateApp

Cmount

Dhydrate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'createApp' which is not optimized for hydration

Using 'mount' instead of 'hydrate' for SSR content

For hydration on client side, use createSSRApp and hydrate to attach Vue to server-rendered HTML.

Practice

1. What is the main benefit of using SSR (Server-Side Rendering) with Vue?

easy

A. Pages load faster and improve SEO

B. It makes Vue apps run only on mobile devices

C. It disables JavaScript on the client

D. It removes the need for components

Solution

1. Step 1: Understand SSR purpose

   SSR renders the Vue app on the server before sending to the browser.

2. Step 2: Identify benefits of SSR

   This server rendering makes pages appear faster and helps search engines read content.

3. Final Answer:

   Pages load faster and improve SEO -> Option A

4. Quick Check:

   SSR improves speed and SEO = C [OK]

Hint: SSR speeds up page load and helps search engines [OK]

Common Mistakes:

• Thinking SSR disables JavaScript
• Believing SSR only works on mobile
• Confusing SSR with removing components

2. Which Vue function is used to create an app that supports SSR?

easy

A. createApp

B. renderApp

C. mountApp

D. createSSRApp

Solution

1. Step 1: Recall Vue SSR setup

   Vue provides a special function to create apps for server-side rendering.

2. Step 2: Identify the correct function

   The function createSSRApp is designed for SSR, unlike createApp which is for client-only apps.

3. Final Answer:

   createSSRApp -> Option D

4. Quick Check:

   SSR app uses createSSRApp = B [OK]

Hint: Use createSSRApp for server-side Vue apps [OK]

Common Mistakes:

• Using createApp instead of createSSRApp
• Thinking mountApp or renderApp exist
• Confusing client and server app creation

3. Consider this Vue SSR code snippet:

const app = createSSRApp({
  data() { return { message: 'Hello SSR' } },
  template: `
{{ message }}
`
})
// Server renders app to string
const html = await renderToString(app)

What will html contain?

medium

A. "{{ message }}"

B. "Hello SSR"

C. ""

D. An error because renderToString is missing

Solution

1. Step 1: Understand renderToString behavior

   renderToString converts the Vue app into HTML string with data rendered.

2. Step 2: Check template and data

   The template uses {{ message }} and data returns 'Hello SSR', so the output is the message inside a div.

3. Final Answer:

   "
   Hello SSR"
   -> Option B

4. Quick Check:

   SSR renders data in HTML = A [OK]

Hint: SSR outputs rendered HTML string, not template code [OK]

Common Mistakes:

• Expecting template syntax in output
• Thinking output is empty div
• Assuming renderToString is undefined error

4. You wrote this SSR Vue code but get an error:

const app = createApp({
  data() { return { count: 0 } },
  template: `
{{ count }}
`
})
const html = await renderToString(app)

What is the likely cause of the error?

medium

A. Template syntax is wrong

B. Missing data function

C. Using createApp instead of createSSRApp

D. renderToString is not async

Solution

1. Step 1: Check app creation method

   For SSR, Vue requires createSSRApp, not createApp.

2. Step 2: Identify error cause

   Using createApp causes renderToString to fail because it expects SSR app instance.

3. Final Answer:

   Using createApp instead of createSSRApp -> Option C

4. Quick Check:

   SSR needs createSSRApp = A [OK]

Hint: Use createSSRApp for SSR, not createApp [OK]

Common Mistakes:

• Thinking data function is missing
• Blaming template syntax
• Assuming renderToString sync error

5. You want to improve SEO and initial load speed of your Vue app. Which approach best uses SSR correctly?

hard

A. Use createSSRApp on server, render to string, send HTML to client

B. Use createApp on client only, no server rendering

C. Render Vue app only after client JavaScript loads

D. Disable JavaScript to speed up loading

Solution

1. Step 1: Identify SSR best practice

   SSR means rendering the app on the server first, then sending HTML to the client.

2. Step 2: Match approach to goal

   Using createSSRApp on server and sending rendered HTML improves SEO and load speed.

3. Final Answer:

   Use createSSRApp on server, render to string, send HTML to client -> Option A

4. Quick Check:

   SSR server render then send HTML = D [OK]

Hint: Render on server first, then send HTML to client [OK]

Common Mistakes:

• Rendering only on client misses SSR benefits
• Delaying render until JS loads hurts speed
• Disabling JavaScript breaks Vue app