What is the difference between JavaScript Engine and JavaScript Runtime Environment

Question

I\'m feeling a bit confused, could someone help to describe What is the difference between JavaScript Engine and JavaScript Runtime Environment. BTW, Event Loop was impleme

Answer 1

Javascript Runtime Environment

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1. Provide various features/API's to build Javascript based software.
2. It also includes a JS Engine(Interpreter + JIT compiler(for optimization purpose)).

Here is the List of Runtime Environments

• Browser: Provides DOM API, Fetch API, Timer(setTimeout & setInterval), Storage(like Local Storage) etc.

Example: Chrome, Firefox, Safari, Opera, Edge etc

• Server Environment: Provides File System Access, Network Access, Console etc.

Example: NodeJS, Deno

• Desktop Environment: Provides GUI API, File System Access, Network Access, Console etc.

Example: Electron etc.

• Mobile Environment:

Example: NativeScript, Ionic, PhoneGap, React Native etc

NOTE: Event Loop is implemented in Runtime Environment

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Javascript Engine(Interpreter/JIT compiler(for optimization purpose))

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1. Converts your Javascript code into machine language/code so that your computer(CPU) will execute it :)

Here is the List of Engines

• Chrome V8 : From Google

Used In: Used in Chrome Browser, NodeJS & in android based mobiles

• SpiderMonkey : From Mozilla

Used In: Used in Firefox Browser

• Nitro / JavascriptCore : From Apple

Used In: Used in Safari Browser & in iOS based mobiles

• Chakra & CharkraCore : From Microsoft

Used In: Used in Microsoft Edge Browser

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Excellent Link for More Infomation