Aung Pyae Phyo

Create a new Next.js Project

Open your terminal and write this following command:

terminal

pnpm create next-app dynamic-og-background

Next.js generator will be show like this:

terminal

✔ What is your project named? … .
✔ Would you like to use TypeScript? … No / Yes
✔ Would you like to use ESLint? … No / Yes
✔ Would you like to use Tailwind CSS? … No / Yes
✔ Would you like to use `src/` directory? … No / Yes
✔ Would you like to use App Router? (recommended) … No / Yes
✔ Would you like to customize the default import alias (@/*)? … No / Yes

Change your directory with this following command:

terminal

cd dynamic-og-background

and open with your code editor or IDE.eg:

terminal

code .

terminal

webstorm .

Project Structure

├── README.md
├── next-env.d.ts
├── next.config.js
├── package.json
├── postcss.config.js
├── public
│   ├── og-bg.png // I created this image to use as background
│   ├── next.svg
│   └── vercel.svg
├── src
│   └── app
│       ├── api // I created this folder to store my api routes
│       │   └── og
│       │       └── route.tsx // Here is my og route
│       ├── fonts // I created this folder to store my fonts
│       │   └── mono.ttf // Here am using outfit font
│       ├── favicon.ico
│       ├── globals.css
│       ├── layout.tsx
│       └── page.tsx
├── tailwind.config.ts
└── tsconfig.json
├── pnpm-lock.yaml

I created api folder to store my api routes and also created fonts folder to store my fonts. You can use any font you want.

Implement the dynamic opengraph route

og/route.ts

import { ImageResponse } from 'next/og';
import { NextRequest } from 'next/server';

export const runtime = 'edge';

export async function GET(req: NextRequest) {
  const { searchParams } = req.nextUrl;
  const postTitle = searchParams.get('title');
  const font = fetch(new URL('../mono.ttf', import.meta.url)).then((res) =>
    res.arrayBuffer(),
  );
  const fontData = await font;

  return new ImageResponse(
    <div
      style={{
        height: '100%',
        width: '100%',
        display: 'flex',
        flexDirection: 'column',
        alignItems: 'flex-start',
        padding: '100',
        justifyContent: 'flex-start',
        backgroundImage: `https://exmaple.com/og-bg.png)`,
      }}
    >
      <p
        style={{
          display: 'flex',
          fontSize: 100,
          fontFamily: 'Jetbrains Mono',
          letterSpacing: '-0.05em',
          fontWeight: '7000',
          fontStyle: 'normal',
          color: 'black',
          lineHeight: '120px',
          whiteSpace: 'pre-wrap',
          textTransform: 'capitalize',
        }}
      >
        {postTitle}
      </p>
    </div>,
    {
      width: 1920,
      height: 1080,
      fonts: [
        {
          name: 'Jetbrains Mono',
          data: fontData,
          style: 'normal',
        },
      ],
    },
  );
}

Output

<meta property="og:image" content="<generated>" />
<meta property="og:image:alt" content="About Acme" />
<meta property="og:image:type" content="image/png" />
<meta property="og:image:width" content="1200" />
<meta property="og:image:height" content="630" />

Code Explanation

Import the necessary modules and constants.
Set Runtime: Declare runtime as 'edge'.
Define an asynchronous function to handle GET requests.
Use the fetch API to get the Outfit font data and convert it to an array buffer.
Generate an ImageResponse object with dynamic JSX content.
Specify options for the ImageResponse, including width, height, and font details.

Test your dynamic opengraph route

pnpm dev
open your browser and enter your dynamic open graph route in your browser address bar.
example: http://localhost:3000/og?title=hello

For more information, check out the official documentation on Open Graph.