With these Single Page Applications you can build anything from simple forms to complicated business logics which require number crunching, database requests & retrieval. Single Page Applications are growing in popularity day by day among developers due to their ability to give a great user experience.
Web crawlers/spiders are programs that visit websites and read their content so they can be cataloged by search engines or used in other ways. The first step for any good Single-page application is to do the basic stuff to get started with crawling it properly, because if your Single-page app is not crawled properly you might have issues serving the appropriate content depending upon the user’s path. So its important that you just setup default links for all of the applications that he crawler might stumble upon.
The Single-page application will take care of the steps further to make it crawlable by the crawler. As Single-Page applications are built using AJAX, they perform client side rendering and hence all content is available on client side, while some Single Page Applications might hold back or cache some data on server side/database which needs to be made available for crawling.
As Single-Page Applications build web pages dynamically from client-side script, there can often be a delay before crawlers start indexing or “craw” your application – especially because most search engines crawl at a much slower rate than human users. Single-Page Applications are supposed to be fast, but when it comes to crawling Single-page applications become slow crawlers in search engine results. For example, Google said that for their crawl budget estimation purposes, a Single-page application is considered “dynamic”.
There are ways of speeding up Single Page Application indexing by doing things like rendering on the server side , having canonical URLs from client side hash (#) navigation and also defining crawler directives within Single-Page app’s HTML.”
Some of the SPA SEO problems include: Not canonicalizing SPA versioned content properly Mobile pages load slowly due to heavier scripts Problems with presenting cached data & a 404 error when a cached page does not exist Crawling of SPA’s content is slow Single page apps are not search crawler friendly Crawling a Single Page App using the conventional URL, while rendering the Single Page App on server side causes issues.
Single-Page Applications do not follow the traditional website development where most pages are linked together with each other like Single-page applications which can be considered as one page. So Single Page Apps would benefit from having separate HTML webpages for each view (content/data). Single-Page apps usually have client side hash navigation to access information whereas search crawlers rely on traditional URL paths, so it may cause Single Page Application SEO issues because of server-side rendering for Single Page Apps which is not crawlable by search engines.