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NodeJs Notes.md

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NodeJs-

http request-

  • get
  • post
  • put
  • patch
  • delete

require dependency-

var dep = require('dependency");

Npm install dependency-

npm install dep

Express-

var app=require("express");
app.get( "/" ,function(req,res){
res.send("");
});

Tell express to listen

app.listen(3000,function(){
});

for all other requests

app.get( "*" ,function(req,res){
res.send("");
});

package.json-

create package.json

npm init

add dependency

npm install dep --save

route params-

  • represent by :variable

  • access by req.params.variable

  • returns req.params object which contains all the params

var app=require("express");
app.get( "/:page" ,function(req,res){
res.send("welcome to"+req.params.);
});

Ejs-

  • Embedded Javascript
  • in /views/ directory
<html>
<%=  
//Embeded Js
%>
<%
//Execute Js
%>
</html>

render in routes by


app.get("/",function(req,res){
res.render("file.ejs");
});

can pass values by-


app.get("/:var",function(req,res){
res.render("file.ejs",{variable : var});
});

stylesheet in /public

app.use(express.static("public"));

look only ejs files

app.set("view engine", "ejs");

Partials-

Include partials ejs-

<%
include /partials/header
%>

computes header.ejs from partials in views directory

Post request-

in form tag in ejs

<form action="/pageRoute" method="post">

</form>
  • install body-parser to extract data on server
  • takes data from form and parse it into js object
  • result is stored in req.query object
var bodyParser = require("body-parser");

app.use(bodyParser.urlencoded({extended : true}));

app.post("/pageRoute",function(req,res){

});

page redirect -

res.redirect("/page");

curl-

http request from terminal

$curl http://google.com

request-

var request = require('request');
request('http://www.google.com', function (error, response, body) {
  if (!error && response.statusCode == 200) {
    console.log(body);
  }
})

Json-

Javascript object notation

{
	"key":"value";
}

comes as string,parse into object to use

var data = JSON.parse(data);