---
import { SEO } from "astro-seo";
---

<html lang="en">
  <head>
    <SEO
      title="A Very Descriptive Title"
      description="A heavily optimized description full of well-researched keywords."
      openGraph={{
        basic: {
          title: "A Very Descriptive Title",
          type: "A type.",
          image: "https://user-images.githubusercontent.com/5182256/131216951-8f74f425-f775-463d-a11b-0e01ad9fce8d.png",
        }
      }}
      twitter={{
        creator: "@jonasmerlins1"
      }}
      extend={{
        // extending the default link tags
        link: [{ rel: "icon", href: "/favicon.ico" }],
        // extending the default meta tags
        meta: [
          {
            name: "twitter:image",
            content: "https://user-images.githubusercontent.com/5182256/131216951-8f74f425-f775-463d-a11b-0e01ad9fce8d.png",
          },
          { name: "twitter:title", content: "Tinker Tailor Soldier Spy" },
          { name: "twitter:description", content: "Agent" },
        ],
      }}
    />
    // ... rest of <head>
  </head>
    <body> // ... body </body>
</html>

Supported Props

Propname	Type	Description
title	string	The title of the page.
titleTemplate	string	Provide a title template to keep a consistent title style. `%s — Astro SEO`, `%s` will be replaced with your title, e.g. `Homepage — Astro SEO`
titleDefault	string	Fallback title that is used if no title is provided.
description	string	Text that gives a concise description of what your page is about.
canonical	string	Prevent duplicate content issues by specifying the "canonical" or "preferred" url of a web page. If you don't define this, `Astro.url.href` will be used as the default value.
noindex	boolean	Set this to true if you don't want search engines to index your page. Since this is an SEO component, this gets set to `false` by default. This way, indexing is strictly opt-out.
nofollow	boolean	Set this to true if you don't want search engines to follow links on your page. Since this is an SEO component, this gets set to `false` by default. This way, following links is strictly opt-out.
charset	string	Set the charset of the document. In almost all cases this should be UTF-8.
languageAlternates	Array<{ href: string; hrefLang: string }>	List of language alternates for the page.
openGraph.basic.title	string	Set the title Open Graph should use. *In most situations, this should be different* from the value of the `title` prop.** See this tweet to gain an understanding of the difference between the two. If you define this, you must define two other OG basic properties as well: `type` and `image`. (Learn more.)
openGraph.basic.type	string	Set the type Open Graph should use. If you define this, you must define two other OG basic properties as well: `title` and `image`. (Learn more.)
openGraph.basic.image	string	URL of the image that should be used in social media previews. If you define this, you must define two other OG basic properties as well: `title` and `type`. (Learn more.)
openGraph.basic.url	string	The canonical URL of your object that will be used as its permanent ID in the graph. Most likely either the url of the page or its canonical url (see above). If you define this, you must define the other 3 OG basic properties as well: `title`, `type` and `image`. (Learn more.). If you define the other 3 OG basic properties but don't define this, `Astro.request.url.href` will be used as the default value.
openGraph.optional.audio	string	A URL to an audio file to accompany this object.
openGraph.optional.description	string	A one to two sentence description of your object.
openGraph.optional.determiner	string	The word that appears before this object's title in a sentence. An enum of (a, an, the, "", auto). If auto is chosen, the consumer of your data should chose between "a" or "an". Default is "" (blank).
openGraph.optional.locale	string	The locale these tags are marked up in. Of the format language_TERRITORY. Default is en_US.
openGraph.optional.localeAlternate	Array	An array of other locales this page is available in.
openGraph.optional.siteName	string	If your object is part of a larger web site, the name which should be displayed for the overall site. e.g., "IMDb".
openGraph.optional.video	string	A URL to a video file that complements this object.
openGraph.image.url	string	For now, setting this is ignored. This is done because `og:image:url` is supposed to be identical to `og:image`. If you have a use case where it makes sense for these to be different, please feel free to contact me, and tell me about it and I will consider adding it. Until then, in the interest of enforcing best practices, the value of this property will be ignored and `og:image:url` set to the value of `openGraph.basic.image`.
openGraph.image.secureUrl	string	Sets `og:image:secure_url`: An alternate url to use if the webpage requires HTTPS.
openGraph.image.type	string	Sets `og:image:type`. A MIME type for the image. e.g. "image/jpeg"
openGraph.image.width	number	Sets `og:image:width`. The number of pixels wide.
openGraph.image.height	number	Sets `og:image:height`. The number of pixels high.
openGraph.image.alt	string	Sets `og:image:alt`. A description of what is in the image (not a caption). If the page specifies `openGraph.basic.image` it should specify `openGraph.image.alt`.
openGraph.article.publishedTime	string	Sets `article:published_time`. The date the article was published. Must be a ISO 8601 DateTime string.
openGraph.article.modifiedTime	string	Sets `article:modified_time`. The date the article was last modified. Must be a ISO 8601 DateTime string.
openGraph.article.expirationTime	string	Sets `article:expiration_time`. The date the article will no longer be relevant. Must be a ISO 8601 DateTime string.
openGraph.article.authors	string[]	Sets `article:author`. The author(s) of the article, if it's only one, pass an array with one entry. If there are multiple, multiple tags with descending relevance will be created.
openGraph.article.section	string	Sets `article:section`. A high-level section name. E.g. Technology
openGraph.article.tags	string[]	Sets `article:tag`. Tag words associated with this article. If it's only one, pass an array with one entry. If there are multiple, multiple tags with descending relevance will be created.
twitter.card	TwitterCardType (string)	Sets `twitter:card`. The card type. Must be one of “summary”, “summary_large_image”, “app”, or “player”.
twitter.site	string	Sets `twitter:site`. (Twitter) @username for the website used in the card footer.
twitter.creator	string	Sets `twitter:creator`. (Twitter) @username for the content creator / author.
twitter.title	string	Sets `twitter:title`. Title of the page or article (equivalent to Open Graph's og:title).
twitter.image	string	Sets `twitter:image`. Full link to the image you want to use for the page (equivalent to Open Graph's og:image).
twitter.imageAlt	string	Sets `twitter:image:alt`. A description of what is in the image (not a caption). If the page specifies `twitter.image` it should specify `twitter.imageAlt`.
twitter.description	string	Sets `twitter:description`. A one to two sentence description of your object.
extend.link	Array<Link extends HTMLLinkElement { prefetch: boolean; }>	An array of free-form `<link>` you'd like to define.
extend.meta	Array<Meta extends HTMLMetaElement { property: string; }>	An array of free-form `<meta>` tags you'd like to define.

Extending Astro SEO

With the v0.3.14 release, you can now define any <meta> and <link> tag you want using the extend prop. For example :

<SEO
  extend={{
    // extending the default link tags
    link: [{ rel: "icon", href: "/favicon.ico" }],
    // extending the default meta tags
    meta: [
      {
        name: "twitter:image",
        content:
          "https://user-images.githubusercontent.com/5182256/131216951-8f74f425-f775-463d-a11b-0e01ad9fce8d.png",
      },
      { name: "twitter:title", content: "Tinker Tailor Soldier Spy" },
      { name: "twitter:description", content: "Agent" },
    ],
  }}
/>

Open Graph

Open Graph properties are passed as one object to the prop openGraph. The structure of this object is modeled after the Open Graph documentation itself. That means it uses nested objects to differentiate between basic and optional properties, as well as object specific ones. If you pass an openGraph config, you must define all 4 of the basic properties (title, type, image and url). The optional properties are all ... well, optional.

// TypeScript interface of openGraph prop
openGraph?: {
  basic: {
    title: string;
    type: string;
    image: string;
    url: string;
  },
  optional?: {
    audio?: string;
    description?: string;
    determiner?: string;
    locale?: string;
    localeAlternate?: Array<string>;
    siteName?: string;
    video?: string;
  }
}

Goals

Our first goal for this project is to support the most-used tags that are relevant for SEO. That includes the most-used open graph tags.

After that comes feature-parity with Next SEO. After that ... we'll see.

What does this component do, exactly?

There's certainly no magic to what Astro SEO does. Basically, it bundles the creation of regular SEO-relevant HTML tags inside one component that you can then use inside your page's <head> tag.

The translation between props and tags is pretty direct and almost 1:1. After building, there probably won't be anything you wouldn't have written yourself. The idea is to surface the options that exist in a central place and adhere to best practices where it's theoretically possible not to. If you want to see how the sausage gets made, there's only one place you will have to check: /src/SEO.astro

If you want, you can view Astro SEO as a checklist, so you don't forget a tag. Or maybe also as an educational tool, to see which options exist in the first place.

Acknowledgements

Astro SEO is heavily inspired by Next SEO and all the amazing work Gary is doing developing it. Thanks Gary! ❤️

Keywords

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Last updated on 03 Mar 2024

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