SEO checklist for Angular InstantSearch
On this page
- 1. Your search result pages are directly accessible through a URL
- 2. Your widgets use crawlable a tags with href attributes
- 3. Your URLs are readable
- 4. Your URLs reflect the structure of your website
- 5. Your robots.txt file
- 6. You use canonical URLs to indicate primary content
- 7. Your category URLs are referenced in a sitemap
- 8. Your canonical pages have unique titles and descriptions
- 9. Your widget’s markup is semantic
- 10. Your website is mobile-friendly
- 11. Your site is using a pre-rendering technique
For your website to appear in a search engine’s results, the search engine needs to be able to discover, crawl, parse, and render the key pages of your site.
Your search result pages are directly accessible through a URL
As users interact with your search interface, the URL should dynamically update and reflect the refinements they’ve selected and their actions.
This allows them to share links to your website, enhancing the overall usability of your search and encouraging backlinking.
This approach has clear benefits for the user experience, but you might be concerned about content duplication. Isn’t this creating too many pages returning the same content? Aren’t dynamic URLs bad for SEO?
Many websites use dynamic URLs. Even though they’re harder to index than static URLs, most search engines can remove query parameters and trace back the primary page.
Contrary to popular thinking, dynamic URLs don’t necessarily hurt your SEO. You should favor dynamic URLs over hiding parameters to make them look static.
You can also have more control over this by carefully crafting your canonical link tags.
Your widgets use crawlable
a tags with
This section is only relevant if you have customized the markup of at least one of your widgets. The default markup implements anchor tags with plain URLs.
Search engines follow the links they find on a page. They should be able to crawl every page of your website by going from link to link.
For example, if you customized the
pagination widget then make sure each page button is an
<a> tag with an
href attribute. It shouldn’t be a
<button> with an event listener.
This especially applies to discovery-related widgets such as
Dos and don’ts
1 2 <a href="https://example.com"> <a href="/relative/path/file">
1 2 3 <a routerLink="some/path"> <span href="https://example.com"> <a onclick="goto('https://example.com')">
Your URLs are readable
Your URLs must be logical and readable. It’s better to use full words than identifiers or abbreviations.
For every InstantSearch flavor, the basic routing configuration injects every search refinement into the URL as a query string parameter. These parameters are inferred from the search state.
1 https://mywebsite.com/?menu[categories]=Cell Phone Accessories&refinementList[brand]=Apple&query=case
The default InstantSearch routing configuration adds a lot of extra information to the URL, which may not be necessary. You should configure the routing to only preserve important and readable keywords.
For example, if someone searches for “red dresses” in a search engine, your website should show up on the results page as
https://mywebsite.com/red-dresses/ rather than
Do’s and don’ts
Your URLs reflect the structure of your website
Some search engines use your URL structure to infer the architecture of your website, understand the context of a page, and enhance their relevance to a particular search query.
Well-structured URLs give your users immediate insight into a page’s topic and its location within the website
For example, if a website has categories and sub-categories, each category should be reachable through
https://mywebsite.com/<category>/ and each sub-category through
Do’s and don’ts
Your robots.txt file
If you use canonical URLs and a sitemap, there is no need to change your robots.txt.
You use canonical URLs to indicate primary content
A canonical URL is the most representative page from a set of duplicate pages on your site.
When users search for “women t-shirts” in a search engine, you want them to find
https://mywebsite.com/Women-Clothing/T-Shirts/ rather than:
Here, all three pages have similar content. As a result, you need to tell search engine bots which URL to reference as the primary page (canonical URL).
To do this, add a
rel="canonical" link that points to the canonical URL on all possible duplicate pages. In the following example, all links need to have a
link element pointing to the primary page.
1 2 3 4 5 6 7 8 9 10 11 12 ### Are mobile pages duplicates? Yes, the mobile version of a page counts as duplicate content. Make sure your mobile pages have a canonical link in their `head`, indicating the desktop page as the primary page. You can also reference the mobile page from the primary page with the following tag: ```html <head> <!-- ... --> <link rel="alternate" media="only screen and (max-width: 640px)"> </head>
Handling paginated content
If you’re using the
pagination widget or the “show more” button of the
infiniteHits widget, make sure that:
- Your widget uses
<a>tags with an
1 2 3 4 5 6 7 8 9
<!-- Pagination --> <ul> <li><a href="https://mywebsite.com/Women-Clothing/T-Shirts/?page=1">1</a></li> <li><a href="https://mywebsite.com/Women-Clothing/T-Shirts/?page=2">2</a></li> <!-- ... --> </ul> <!-- "Show more" button --> <a href="https://mywebsite.com/Women-Clothing/T-Shirts/?page=2">Show more</a>
- Each page can be accessed directly through a URL.
- Each page URL has a canonical link to its primary page.
If your pagination occurs on scroll (as is the case with the
infiniteHits widget), make sure you still provide a “show more” link that uses plain URLs.
Some search engines use the HTML
link elements with attributes
rel="prev" in the
<head> of your page to infer the relationship between component URLs in a paginated series. These elements can be helpful, but they’re not an indexing signal for all search engines.
Your category URLs are referenced in a sitemap
A sitemap is an XML file that tells search engine crawlers which pages are central to your site. Having a sitemap is particularly recommended for large websites with many unrelated pages.
When deciding which pages to put in your sitemap, a good rule is to include only your canonical pages.
If you’re not using a content management system (CMS) that automatically generates a sitemap for you, you can generate one based on your Algolia indices.
Your canonical pages have unique titles and descriptions
description meta tags give search engine users important insight into the content of a search result and its relevance. This information often determines which search engine result a person clicks on, so it’s crucial to use high-quality titles and descriptions in your web pages.
Your widget’s markup is semantic
InstantSearch widgets provide a default semantic markup that should cover most cases, but if you are using connectors to customize your UI, make sure to properly use markup according to its meaning and purpose.
For example, use heading elements (
h6) for headings, paragraph elements (
p) for paragraphs, list elements (
dl) for lists, tables (
table) for data tables. Semantic markup helps search engines identify and categorize your content with minimal effort.
Do’s and don’ts
1 2 3 <h1>foo</h1> <p>foo bar.</p> <p>baz scribble.</p>
1 2 3 <p class"heading">foo</p> foo bar.<br><br> baz scribble.
Because your site’s records are unique, you need to customize the markup template for the
Here’s a possible template for a product search result on an ecommerce website:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 <article> <header> <h2>Google Chromecast Ultra</h2> <p>TV & Home Theater</p> </header> <div> <img src="https://cdn-demo.algolia.com/bestbuy-0118/4397400_sb.jpg" width="220" height="146" alt="Google Chromecast Ultra" /> <p>Enjoy all your favorite movies, shows, games and music plus the latest 4K content with Chromecast Ultra, a streaming device that…</p> </div> <footer> <p> <span>$</span> <strong>69</strong> <span>Rating: 4/5</span> </p> </footer> </article>
While Algolia correctly uses semantic markup (the content is isolated in an
article element, a
header section with the product name in an
h2 element, a product image with an
alt attribute, the main description in a
p element), you’re missing some information details that could be useful for a search engine (“TV & Home Theater” is the product category, “69” is its price in
dollars). You can solve this by using structured data.
Structured data is a standardized format for providing information about a page and classifying its content. With structured data, you can give search engines insight into the meaning of your pages.
Here’s how to add structured data to the previous example:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 <article itemscope itemtype="http://schema.org/Product"> <header> <h2 itemprop="name">Google Chromecast Ultra</h2> <p itemprop="category">TV & Home Theater</p> <meta itemprop="brand" content="Google" /> <meta itemprop="gtin12" content="GA3A00403A14" /> </header> <div> <img itemprop="image" src="https://cdn-demo.algolia.com/bestbuy-0118/4397400_sb.jpg" width="220" height="146" alt="Google Chromecast Ultra" /> <p itemprop="description">Enjoy all your favorite movies, shows, games and music plus the latest 4K content with Chromecast Ultra, a streaming device that…</p> </div> <footer> <p> <span itemprop="offers" itemscope itemtype="http://schema.org/Offer"> <span itemprop="priceCurrency" content="USD">$</span> <strong itemprop="price" content="69.00">69</strong> <link itemprop="url" href="https://www.amazon.com/Google-Chromecast-Ultra/dp/B0157OY5EA/" /> <meta itemprop="availability" content="https://schema.org/InStock" /> <meta itemprop="priceValidUntil" content="2021-11-05" /> </span> <span itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating"> Rating: <span itemprop="ratingValue">4</span>/<span itemprop="bestRating">5</span> <meta itemprop="reviewCount" content="89" /> </span> </p> <meta itemprop="sku" content="0446310786" /> </footer> </article>
This markup is now much more complete: it explicitly references what the content represents (product name, category, price, rating). You have also added content for search engines using
Search engines support a variety of structured data, and you’re encouraged to mark up your content with it. You can find more examples in this gallery and test your markup using the Structured Data Testing Tool.
Here are some examples of templates with structured data for InstantSearch widgets:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 <ol itemscope itemtype="https://schema.org/BreadcrumbList"> <li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"> <a itemtype="https://schema.org/Thing" itemprop="item" href="https://example.com/"> <span itemprop="name">Home</span> </a> <meta itemprop="position" content="1"> </li> <li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"> <a itemprop="item" itemtype="https://schema.org/Thing" href="https://example.com/cameras-and-camcorders"> <span itemprop="name">Cameras & Camcorders</span> </a> <meta itemprop="position" content="2"> </li> <li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"> <span itemprop="name">Digital Cameras</span> <meta itemprop="item" itemtype="https://schema.org/Thing" content="https://example.com/cameras-and-camcorders/digital-cameras"> <meta itemprop="position" content="3"> </li> </ol>
Your website is mobile-friendly
Due to the increasing number of users who browse the web on mobile, more search engines value mobile-friendly websites and only index content visible on a mobile device.
Therefore, your mobile and desktop sites must share the same content, structured data, title, and description meta tags.
Your site is using a pre-rendering technique
Server-side rendering (SSR)
React InstantSearch, React InstantSearch Hooks, Angular InstantSearch and Vue InstantSearch fully support server-side rendering. InstantSearch.js doesn’t support it. For InstantSearch.js, you can use dynamic rendering.
Dynamic rendering provides the SEO benefits of server-side rendering when implementing server-side rendering is either too costly or impossible.
InstantSearch.js, React InstantSearch, React InstantSearch Hooks, Angular InstantSearch and Vue InstantSearch fully support dynamic rendering. Although Dynamic Rendering is a mature technology, it adds the overhead of a round trip to your rendering server, which may impact your response time, therefore your SEO. We recommend using it solely with InstantSearch.js, which currently doesn’t support Server Side Rendering.
Since speed can affect SEO, ensure that the headless browser in charge of pre-rendering your website is fast and reliable.