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shepherdjerred / astro-opengraph-images

Generate Open Graph images for your Astro site
https://www.npmjs.com/package/astro-opengraph-images
GNU General Public License v3.0
31 stars 2 forks source link
astro open-graph resvg satori typescript

readme

project logo [![astro-opengraph-images](https://img.shields.io/npm/v/astro-opengraph-images.svg)](https://www.npmjs.com/package/astro-opengraph-images) Generate Open Graph images for your Astro site. This project is actively maintained. If you have a feature request or need help, please [create an issue](https://github.com/shepherdjerred/astro-opengraph-images/issues/new).

What is Open Graph?

Open Graph is a protocol created by Facebook. It allows pages on your site to be richly embedded into other sites and applications.

You've probably seen this in action when posting a link on Facebook, Twitter, Slack, iMessage, or Discord. Links posted in supported applications will display the Open Graph metadata which often includes an image. This library will generate those images for you.

Features

[!WARNING] This integration has only been tested with statically rendered sites. It is untested with server-side rendering.

Quick Start

To better illustrate these steps, I've created a video following them to help others follow along.

  1. Add this integration to your Astro config:

    • Option 1: use the astro command:

      npx astro add astro-opengraph-images

    • Option 2: install the package and add the integration to your Astro config:

      npm i astro-opengraph-images
      +import opengraphImages from "astro-opengraph-images";

export default defineConfig({
integrations: [
+    opengraphImages()
],
});

  2. Install React. React is used by the presets, and can be used to easily author custom images. Note that React is only used for generating the images and will not be shipped to clients.

    npm i -D react

  3. Install the fonts you want to use. Fonts must be explicitly declared to be used for images. System fonts are not available. For this quick start guide, we'll install the Roboto font:

    npm i @fontsource/roboto

    You can find more fonts on Fontsource, or you can use any font file that you have. See Satori's font documentation for more information.

  4. Configure the integration in your Astro config:

    -import opengraphImages from "astro-opengraph-images";
+import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
 integrations: [
-    opengraphImages()
+    opengraphImages({
+      options: {
+        fonts: [
+          {
+            name: "Roboto",
+            weight: 400,
+            style: "normal",
+            data: fs.readFileSync("node_modules/@fontsource/roboto/files/roboto-latin-400-normal.woff"),
+          },
+        ],
+      },
+      render: presets.blackAndWhite,
+    }),
 ],
});

  5. Set the site property in your Astro config:

    Open Graph requires URLs to be absolute, including the domain your site is hosted at. This integration uses the site defined in your Astro config to create the correct URLs for Open Graph which is site must be defined.

    export default defineConfig({
+  site: "https://<your site>.com",
 integrations: [
   opengraphImages({
     options: {
       fonts: [
         {
           name: "Roboto",
           weight: 400,
           style: "normal",
           data: fs.readFileSync("node_modules/@fontsource/roboto/files/roboto-latin-400-normal.woff"),
         },
       ],
     },
     render: presets.blackAndWhite,
   }),
 ],
});

  6. Update your main Astro layout with the appropriate meta tags. The Open Graph site has more information possible tags.

    The following meta tags must be defined:

    • og:title
      • This field may be used when generating images.
    • og:type
    • og:image
      • Set this to the return value of getImagePath (example shown below).
      • If the value of og:image does not match what this integration expects then your site will fail to build. This will ensure your site is correctly configured to display Open Graph images.
    • og:description
      • Optional. This field may be used when generating images.

    Your site will fail to build if the tags above are not set.

    • Option 1: Use the astro-seo package:

      Install the astro-seo package:

      npm i astro-seo

      Update your Astro layout to use the SEO component:

      ---
+import { SEO } from "astro-seo";
+import { getImagePath } from "astro-opengraph-images";

interface Props {
title: string;
}

const { title } = Astro.props;
+const { url, site } = Astro;
+const openGraphImageUrl = getImagePath({ url, site });
---

<!doctype html>
<html lang="en">
<head>
 <meta charset="UTF-8" />
 <meta name="description" content="Astro description" />
 <meta name="viewport" content="width=device-width" />
 <link rel="icon" type="image/svg+xml" href="https://github.com/shepherdjerred/astro-opengraph-images/blob/main/favicon.svg" />
 <meta name="generator" content={Astro.generator} />
 <title>{title}</title>

+    <SEO
+      openGraph={
+        {
+          basic: {
+            title: title,
+            type: "website",
+            image: openGraphImageUrl,
+            url: url,
+          },
+          optional: {
+            description: "My page description",
+          },
+        }
+      }
+    />
</head>
<body>
 <slot />
</body>
</html>

    • Option 2: Manually add the meta tags to your Astro layout.

  7. Build your site. You should see a .png file next to each .html page in your dist folder. Double-check that the og:image proprety in your .html file matches the path to the .png file.

  8. Deploy your site. You can verify that your images are correct by:

    • Sending a link to your site in an application that supports Open Graph like iMessage, Slack, Discord, etc.
    • Visit opengraph.xyz and test your site.

Examples

There is an example site using this integration under examples/.

Sites Using This

If you're using this project, open a PR to add your site to this list.

Custom Renderers

You can create your own custom images with a render function. Take a look at how a preset works.

Renderers have access to the page's DOM using jsdom. You can use this to render your Open Graph image using any of the content from the associated HTML page. An example of this is shown in the custom property preset which shows a preview of the page's body text in the Open Graph image.

This library uses Satori to convert React components to SVG. The SVG is then converted to a PNG using resvg-js.

[!TIP] Satori supports a subset of CSS. Be sure to familiarize yourself with its limitations.

You can use the Satori playground to work on your images.

You can use Tailwind syntax with tw-to-css. An example is the Tailwind preset. You'll need to install this package yourself.

Presets

Presets are located in src/presets/. Open a pull request to contribute a preset you've created.

Note: some presets use the tw-to-css library. You'll need to install this dependency separately when using one of these presets. You'll see an error if the library is not already installed.

npm i tw-to-css

backgroundImage

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.backgroundImage,
    }),
  ],
});

blackAndWhite

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.blackAndWhite,
    }),
  ],
});

brandedLogo

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.brandedLogo,
    }),
  ],
});

customProperty

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.customProperty,
    }),
  ],
});

gradients

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.gradients,
    }),
  ],
});

podcast

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.podcast,
    }),
  ],
});

rauchg

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.rauchg,
    }),
  ],
});

simpleBlog

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.simpleBlog,
    }),
  ],
});

tailwind

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.tailwind,
    }),
  ],
});

vercel

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.vercel,
    }),
  ],
});

waveSvg

import opengraphImages, { presets } from "astro-opengraph-images";

export default defineConfig({
  integrations: [
    opengraphImages({
+      render: presets.waveSvg,
    }),
  ],
});

Alternatives

Here are some similar libraries using Satori and Astro. I haven't done a feature comparison.