JavaScript is in its origin a scripting language that can be used to create interactivity on web pages. Along with CSS and HTML, JavaScript is one of the most commonly used programming languages in website development.
JavaScript is now used for a wide variety of applications on websites, for example, JS can also be used to make forms interactive.
JavaScript and search engine optimization
JavaScript optimized for Search Engine Crawler is an important part of search engine optimization. Previously, Google could not read the code around JavaScript, which is why the programming language was useless for the search engine and its Googlebot. Especially providing important content via JavaScript, instead of using HTML or CSS, can be difficult. It can always be that users get this information displayed, but Google can’t read it.
This is mainly because web pages are indexed and rendered independently. The reason for this is that processing JavaScript content requires an enormous amount of resources and thus indexing takes more time.
However, in the meantime, Google’s technology and capabilities have changed, and the Googlebot can read, render, and crawl JS. A residual risk remains: It is not always certain whether the crawler reads the content correctly and also interprets it. Therefore, the use of JavaScript should be taken with a grain of salt.
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