Open Graph metadata in NextJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Open Graph metadata used for in web development?

Open Graph metadata helps control how web pages appear when shared on social media platforms by defining titles, descriptions, images, and other preview details.

beginner

Which HTML tag is used to add Open Graph metadata to a page?

The <meta> tag inside the <head> section is used to add Open Graph metadata with properties like og:title, og:description, and og:image.

intermediate

How do you add Open Graph metadata in a Next.js app using the App Router?

You add Open Graph metadata by exporting a metadata object from your page or layout file with an openGraph property containing title, description, images, and other info.

beginner

Name three common Open Graph properties you should include for good social sharing.

Common Open Graph properties are og:title (page title), og:description (summary), and og:image (preview image URL).

beginner

Why is it important to include Open Graph metadata in your Next.js app?

Including Open Graph metadata improves how your pages look when shared on social media, making them more attractive and clickable, which can increase traffic.

Which Next.js feature allows you to define Open Graph metadata easily?

A Adding meta tags in _app.js

B Using getStaticProps only

C Exporting a metadata object with openGraph property

D Using useEffect hook

Next.js App Router supports exporting a metadata object from page or layout files, including an openGraph property for Open Graph metadata.

What does the Open Graph property 'og:image' specify?

A The URL of the image shown when sharing the page

B The page's background color

C The font used on the page

D The page's URL

'og:image' defines the image URL that social platforms show as a preview when the page is shared.

Where in the HTML document should Open Graph meta tags be placed?

A Inside a <footer> tag

B Inside the <head> section

C At the end of the <body>

D Before the <!DOCTYPE> declaration

Meta tags, including Open Graph tags, belong inside the section of the HTML document.

Which of these is NOT a standard Open Graph property?

A og:title

B og:description

C og:url

D og:font

'og:font' is not a recognized Open Graph property; fonts are not controlled by Open Graph metadata.

What is the main benefit of adding Open Graph metadata to your Next.js pages?

A Improves social media sharing previews

B Speeds up page loading

C Changes the page's URL

D Adds animations to the page

Open Graph metadata controls how your page looks when shared on social media, improving previews and click rates.

Explain how to add Open Graph metadata in a Next.js app using the App Router.

Think about the special object Next.js expects for metadata.

List the key Open Graph properties you should include for good social media sharing and why.

Focus on what users see when a link is shared.

Practice

1. What is the main purpose of Open Graph metadata in a Next.js app?

easy

A. To improve the page loading speed

B. To handle user authentication

C. To add custom fonts to the page

D. To control how the page appears when shared on social media

Solution

1. Step 1: Understand Open Graph metadata role

   Open Graph metadata defines how a webpage looks when shared on social media platforms.

2. Step 2: Relate to Next.js usage

   Next.js uses the metadata export to automatically add Open Graph tags for sharing previews.

3. Final Answer:

   To control how the page appears when shared on social media -> Option D

4. Quick Check:

   Open Graph = Social media preview [OK]

Hint: Open Graph controls social media preview appearance [OK]

Common Mistakes:

• Confusing Open Graph with performance optimization
• Thinking it manages fonts or styles
• Assuming it handles user login

2. Which is the correct way to define Open Graph metadata in a Next.js App Router page?

easy

A. export const metadata = { openGraph: { title: 'My Page' } }

B. const openGraph = { title: 'My Page' }; export default openGraph

C. export function metadata() { return { title: 'My Page' } }

D. import metadata from 'next/metadata'; metadata.title = 'My Page';

Solution

1. Step 1: Recall Next.js metadata export syntax

   Next.js App Router expects a named export called metadata as an object.

2. Step 2: Check Open Graph nested object

   Open Graph metadata is nested inside openGraph property within metadata.

3. Final Answer:

   export const metadata = { openGraph: { title: 'My Page' } } -> Option A

4. Quick Check:

   metadata export with openGraph object = A [OK]

Hint: Use named export 'metadata' with openGraph object [OK]

Common Mistakes:

• Using default export instead of named export
• Defining metadata as a function instead of an object
• Trying to import and mutate metadata

3. Given this metadata export in a Next.js page:

export const metadata = {
  openGraph: {
    title: 'Welcome',
    description: 'Home page',
    url: 'https://example.com',
    images: ['https://example.com/image.png']
  }
}

What will be the Open Graph og:title content in the rendered HTML?

medium

A. https://example.com/image.png

B. Home page

C. Welcome

D. https://example.com

Solution

1. Step 1: Identify the Open Graph title property

   The title inside openGraph sets the og:title tag content.

2. Step 2: Match the value to the tag

   The value is 'Welcome', so og:title will be 'Welcome'.

3. Final Answer:

   Welcome -> Option C

4. Quick Check:

   og:title = metadata.openGraph.title = 'Welcome' [OK]

Hint: og:title matches openGraph.title value [OK]

Common Mistakes:

• Confusing description or url as title
• Using images URL as title
• Not recognizing nested openGraph object

4. You wrote this metadata in a Next.js page:

export const metadata = {
  openGraph: {
    title: 'Page',
    images: 'https://example.com/img.png'
  }
}

Why might the Open Graph image not appear correctly when shared?

medium

A. images should be an array, not a string

B. title property is missing

C. openGraph must be a function, not an object

D. metadata must be default export

Solution

1. Step 1: Check images property type

   Open Graph expects images as an array of URLs, not a single string.

2. Step 2: Identify the issue

   Using a string instead of an array causes the image tag to be missing or invalid.

3. Final Answer:

   images should be an array, not a string -> Option A

4. Quick Check:

   images array required for Open Graph images [OK]

Hint: images must be an array even for one image [OK]

Common Mistakes:

• Passing a string instead of array for images
• Forgetting to export metadata as named export
• Thinking openGraph should be a function

5. You want to add Open Graph metadata with a dynamic image URL based on a page prop imageUrl. Which approach correctly sets the metadata in a Next.js App Router page?

hard

A. export const metadata = { openGraph: { images: [imageUrl] } }

B. export function generateMetadata({ params }) { return { openGraph: { images: [params.imageUrl] } } }

C. const metadata = { openGraph: { images: [imageUrl] } }; export default metadata

D. export async function metadata() { return { openGraph: { images: [await getImage()] } } }

Solution

1. Step 1: Understand dynamic metadata in Next.js App Router

   For dynamic metadata, Next.js uses a generateMetadata function that receives page props.

2. Step 2: Check options for correct dynamic usage

   export function generateMetadata({ params }) { return { openGraph: { images: [params.imageUrl] } } } correctly defines generateMetadata returning metadata using params.imageUrl.

3. Final Answer:

   export function generateMetadata({ params }) { return { openGraph: { images: [params.imageUrl] } } } -> Option B

4. Quick Check:

   Dynamic metadata uses generateMetadata function [OK]

Hint: Use generateMetadata function for dynamic Open Graph data [OK]

Common Mistakes:

• Trying to use static metadata export for dynamic data
• Using default export instead of named export
• Defining metadata as async function named 'metadata'