Faster speed : JavaScript is fast because it run immediately within the client-side browser. Javascript is not dependant on network unless backend data is required to be processed. Need to compile Javascript on the client–side as it is interpreted directly by web browsers.

Interoperability : Javascript can be inserted into web page regardless of extension. Within other languages such as Perl and PHP it can be used inside the script.

Rich interfaces : Javascript has vast libraries like (charts, drag and drop, sliders etc.) which enables you to provide attractive look to your website.

Reduction in server load : Since Javascript is client-side scripting language it reduces load on website servers as many operations can be performed at client-side which reduces load on server and enables it serve to more users.