JavaScript is a language of freely typed client-side scripting that is executed in the user's browser. To make an interactive web user interface, JavaScript interacts with DOM elements (HTML components). JavaScript utilizes ECMAScript guidelines that incorporate core attributes based on the ECMA-262 standard and other characters not premised on ECMAScript norms.

JavaScript can be utilized in a variety of functions such as handling various DOM element events, validation of data, modifying the style of DOM element, display of popup messages, etc. The sample form produced below uses JavaScript for validating data and changing form color.

1st Name:

Middle Name:

Last Name:

Address:

Date of Birth:

City:

Country:

Zip Code:

Submit

In the browser, JavaScript engine compiles, interprets, and executes JavaScript code, which is located on a web page. It caters to memory management, a compilation of JIT, system typing, and so on. Each browser has numerous JavaScript engines embedded in it.