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What is “server” in server-side javascript like NodeJS?

Posted by: admin November 29, 2017 Leave a comment

Questions:

Is it not a Javascript engine hosted by the browser on the client machine itself?

Answers:

No, it isn’t.

Server generally has two meanings:

  1. A piece of software that listens for network requests and then responds to them
  2. A computer running such a piece of software

A Node.JS server can be either of those.

In web programming, a Node.JS server takes the place of Perl, Python, Ruby, PHP, Scala, etc. (And like those other languages, Node.JS lets you use JavaScript for non-server and non-web purposes).

Generally the server itself is run directly from Node (e.g. with this library) rather than being embedded in another server like Apache (as is most common for PHP).

A browser doesn’t need to be involved at all. If one is, then it will probably be one acting as a client and making a request to the server. That said, tools like PhantomJS can allow a browser to be driven from Node (and other programming languages).

Questions:
Answers:

From here:

Server-side JavaScript (SSJS) refers to JavaScript that runs on
server-side and is therefore not downloaded to the browser. This term
is used to differentiate it from regular JavaScript, which is
predominantly used on the client-side (also referred to as client-side
JavaScript or CSJS for short).

Questions:
Answers:

NodeJS runs on the V8 JavaScript Engine which does not have to be in a browser. It just executes JS. It does not depend on what you do with it. In the case of a NodeJS server, it listens to HTTP requests and is therefore a server.

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Answers:

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node.js is single threaded process and run event loops

Questions:
Answers:

Node.js is a framework/program that is installed on a machine and contains code written in javascript and process those codes requested by a client like a browser, Yes each browser contains its own engine that process the javascript.