@vercel/og

What is @vercel/og?

@vercel/og is a package designed to generate Open Graph images dynamically. It allows developers to create custom social media preview images on the fly using HTML and CSS, which can be particularly useful for generating unique images for each page or post on a website.

What are @vercel/og's main functionalities?

Generate Open Graph Images

This feature allows you to generate Open Graph images dynamically using HTML and CSS. The code sample demonstrates how to create an image with a custom title passed as a query parameter.

const { ImageResponse } = require('@vercel/og');

export default function handler(req, res) {
  const { searchParams } = new URL(req.url, 'http://localhost');
  const title = searchParams.get('title') || 'Default Title';

  const image = new ImageResponse(
    <div style={{
      fontSize: 128,
      color: 'white',
      background: 'black',
      width: '100%',
      height: '100%',
      display: 'flex',
      alignItems: 'center',
      justifyContent: 'center',
    }}>
      {title}
    </div>,
    {
      width: 1200,
      height: 630,
    }
  );

  res.setHeader('Content-Type', 'image/png');
  res.send(image);
}

Other packages similar to @vercel/og

puppeteer

Puppeteer is a Node library which provides a high-level API to control Chrome or Chromium over the DevTools Protocol. It can be used to generate screenshots and PDFs of web pages, which can include Open Graph images. Compared to @vercel/og, Puppeteer offers more flexibility and control over the browser environment but requires more setup and resources.

html-to-image

html-to-image is a library that allows you to convert HTML nodes to images in various formats. It is simpler and more lightweight compared to @vercel/og, but it may not offer the same level of customization and dynamic content generation capabilities.

sharp

Sharp is a high-performance image processing library for Node.js. It can be used to create, manipulate, and convert images. While it does not directly generate images from HTML/CSS like @vercel/og, it can be used in conjunction with other tools to achieve similar results.

README

@vercel/og

Satori based Open Graph Image generation adapter for Vercel’s Edge Function.

Basic Usage

Install @vercel/og, then use it inside Edge API routes in your Next.js project:

// /pages/api/og.jsx
import { ImageResponse } from '@vercel/og'

export const config = {
  runtime: 'experimental-edge',
}

export default function () {
  return new ImageResponse(
    (
      <div
        style={{
          fontSize: 128,
          background: 'white',
          width: '100%',
          height: '100%',
        }}
      >
        Hello!
      </div>
    )
  )
}

The React element will be rendered and responded as a PNG from that Edge Function endpoint. For more details and restrictions in image generation, see Satori.