JAVASCRIPT

what is node js

Node.js is an open-source, cross-platform, 
back-end JavaScript runtime environment 
that runs on the V8 engine and executes
JavaScript code outside a web browser.

what is node.js

Javascript was always a client side language until node.js.
Common server side languages include PHP, Python, Perl, Ruby
and several more. Node enables you to use Javascript server side.
This now means you can have a consistent language both ends
which could not be done prior to Node.

what is node.js? what is it used for?

* 
Node.js is an open-source server side runtime environment built on 
Chrome's V8 JavaScript engine. It provides an event driven, non-blocking 
(asynchronous) I/O and cross-platform runtime environment for building
highly scalable server-side applications using JavaScript.

what is node js

Node.js = Runtime Environment + JavaScript Library

What is Node.js? What is it used for?

-> Microservices-based architecture lets you split your application 
   into small units.
-> Each part can independently deploy and scale; 
   it does not matter if different programming languages and teams write it.
-> You can also test the small units individually.

node js

NodeJs is Runtime environment for executing Js code, Outside Of Browser.
it is build upon Chrome v8 engine using c++.

Uses of Node:

-can build back-end services like API which can be used as backend for 
diferent platform Apps(Website, MobileApp, Desktop App).

-is Asynchronous by default means Single thread handle all the request
and response, thereby providing more speed, highly scalable, built time half 
compare to other tech in market, 33% few line of code, 40% fewer files,
can handle 2times more requests/secs, 35% fast response time.
// Hope you like the short Description.

node js

Node js allows you to run javascript outside of your browser
ex: you are able to run it on your terminal

node.js

Node.js is an open-source, cross-platform, back-end JavaScript runtime environment that runs on the V8 engine and executes JavaScript code outside a web browser.

node js

Node.js allows you to run JavaScript on the server.

node.js

When you install Node.js, you can do these things:
Make web servers
Run JavaScript without an HTML file
...and more!

node js

so if you are looking to download Node.js fro windows 7
the last working version of node.js that works on windows 7 is
"https://nodejs.org/download/release/v13.6.0/"

what is node

npm install http then write a webserver...
const http = require('http');
const PORT = 3000;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World');
});

server.listen(port, () => {
  console.log(`Server running at PORT:${port}/`);
});

what is a node

Is a child of EventTarget
Node = DOM objects =  Attr, CharacterData (which Text, Comment, and CDATASection are all based on), ProcessingInstruction, DocumentType, Notation, Entity, and EntityReference.
function isNode(o){
  return (
    typeof Node === "object" ? o instanceof Node : 
    o && typeof o === "object" && typeof o.nodeType === "number" && typeof o.nodeName==="string"
  );
}

Nodejs

Node.js = Runtime Environment + JavaScript Library

Node.js

/*eslint no-undef: "error"*/
/*eslint-env node*/

var fs = require("fs");
module.exports = function() {
    console.log(fs);
};

nodejs

var http = require("http");

http.createServer(function(request, response) {
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("Hello World");
  response.end();
}).listen(8888);

nodejs

const { subtle } = require('crypto').webcrypto;

async function generateEcKey(namedCurve = 'P-521') {
  const {
    publicKey,
    privateKey
  } = await subtle.generateKey({
    name: 'ECDSA',
    namedCurve,
  }, true, ['sign', 'verify']);

  return { publicKey, privateKey };
}

nodejs

# Using Ubuntu
curl -fsSL https://deb.nodesource.com/setup_17.x | sudo -E bash -
sudo apt-get install -y nodejs

# Using Debian, as root
curl -fsSL https://deb.nodesource.com/setup_17.x | bash -
apt-get install -y nodejs

NodeJs

alias node13='export PATH="/usr/local/opt/node@13/bin:$PATH"'
alias node12='export PATH="/usr/local/opt/node@12/bin:$PATH"'
alias node10='export PATH="/usr/local/opt/node@10/bin:$PATH"'

nodejs

Method: GET
URL: /table
Path_Name: /table
Query: "{}"

node.js

npm install --save-dev jshint

node.js

request.setName("Node.js");

Node.js

/* Hello world in Node.js */

var sys = require('sys');
sys.puts('Hello World');

node js

const url = require('url');

node.js

SyntaxError: Unexpected token 'catch' in /Users/rseranga/code/mongoose-soccerteams/views/teams/show.ejs while compiling ejs

If the above error is not helpful, you may want to try EJS-Lint:
https://github.com/RyanZim/EJS-Lint
Or, if you meant to create an async function, pass async: true as an option.
    at new Function (<anonymous>)
    at Template.compile (/Users/rseranga/code/mongoose-soccerteams/node_modules/ejs/lib/ejs.js:633:12)
    at Object.compile (/Users/rseranga/code/mongoose-soccerteams/node_modules/ejs/lib/ejs.js:392:16)
    at handleCache (/Users/rseranga/code/mongoose-soccerteams/node_modules/ejs/lib/ejs.js:215:18)
    at tryHandleCache (/Users/rseranga/code/mongoose-soccerteams/node_modules/ejs/lib/ejs.js:254:16)
    at exports.renderFile [as engine] (/Users/rseranga/code/mongoose-soccerteams/node_modules/ejs/lib/ejs.js:485:10)
    at View.render (/Users/rseranga/code/mongoose-soccerteams/node_modules/express/lib/view.js:135:8)
    at tryRender (/Users/rseranga/code/mongoose-soccerteams/node_modules/express/lib/application.js:640:10)
    at Function.render (/Users/rseranga/code/mongoose-soccerteams/node_modules/express/lib/application.js:592:3)
    at ServerResponse.render (/Users/rseranga/code/mongoose-soccerteams/node_modules/express/lib/response.js:1008:7)