What is the difference between host objects and native objects in JavaScript?

Native objects are built-in objects defined by the ECMAScript standard. They are part of the JavaScript language itself.

Host objects are objects provided by the JavaScript runtime environment (browser, Node.js). They are not part of the ECMAScript standard but are available in the specific environment.

Examples:

• Native objects: Object, Array, Function, String, Number, Boolean, Date, RegExp, Map, Set, Promise, Math, JSON.
• Host objects (in browsers): window, document, console, XMLHttpRequest, setTimeout, DOM elements (e.g., HTMLElement).

Main differences:

Criterion	Native objects	Host objects
Defined by standard	Yes (ECMAScript)	No (runtime environment)
Availability	Available in any environment supporting ECMAScript	Depends on the specific runtime environment
Examples	Array, Object, String	window, document, console (in browsers)
Main role	Basic building blocks of the language	Interaction with the environment (browser, OS, etc.)

Additionally:

• Host objects may have properties and methods that differ or are even absent in different environments.
• The behavior of host objects may not be fully standardized, whereas the behavior of native objects is clearly described in the ECMAScript specification.