NODE JS CODE TO SEARCH ENTERPRISE ID IN AZURE COGNITIVE SEARCH SERVICE (ACS)

NODE JS CODE TO GET THE SESSION ID USING THE USERNAME AND PASSWORD

NODE JS PROGRAM - PRINT NUMBERS FROM 1 TO 10

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## Write a Node Js program to print numbers from 1 to 10

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// Define the upper limit for the loop const limit = 10; // Print numbers from 1 to the limit using a for-loop console.log("Printing numbers using a for loop:"); for (let i = 1; i <= limit; i++) {                    console.log(i); }

NODE JS PROGRAM - FACTORIAL OF A NUMBER

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 ## Write a Node Js program to print the Factorial of a number

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function factorial(n) {              if (n === 0 || n === 1) {                                  return 1;              }              else {                                  return n * factorial(n - 1);              }  }  const number = 10;                             // Change this to calculate the factorial of a different number  const result = factorial(number);       // Function calling console.log(`Factorial of ${number} is: ${result}`);

NODE JS PROGRAM - PRINT EACH NUMBER OF AN ARRAY USING LOOP

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 ## Write a Node Js program to iterate over an array and print each number

---

const arrNumber  = [1,2,3,4,5]; console.log ( "Printing numbers using a FOR Loop: ");  for (let i = 0 ; i < arrNumber.length ; i++) {             console.log (arrNumber[i]); }

Node js program - IF ELSE IF example

# Node js program using if else if statement

var a = 'route 1';

if (a === 'route 1'){
    console.log ('Route is 1');
}else if ( a === 'route 2')  {
     console.log ('Route is 2');
}else {
    console.log ( 'No Route');
}

## When you run this program

## Output will be - 

Route is 1

Node js program - IF ELSE example

# Node js program using if else statement

var a = 'route 1';

if (a === 'route 1'){
    console.log ('True');
}else {
     console.log ('False');
}

## When you run this program

## Output will be - 

True

Node js to create the mysql Database

var mysql = require('mysql');
var con = mysql.createConnection({ host: "localhost", user: "admin", password: "admin" });
con.connect(function(err) {
    if (err)
        throw err;
    console.log("Connected!");
    con.query("CREATE DATABASE cprogramcodes", function (err, result) {
         if (err)
            throw err;
        console.log("Database created");
     });
});

Node js program to write HELLO WORLD

 // node js code to create a server and write HELLO WORLD!

var http = require ('http');

http.createServer (function (req,res) => {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end('HELLO WORLD!');})
.listen(8080);

// Copy and paste the above code into a file and name it helloworld.js
// Now to run it, open the command prompt and go to the file location
// Execute the first command - >
//                                                 npm i http
//Execute the second command ->
//                                                node helloworld.js
// now open browser and copy and paste the link in the URL - http://localhost:8080

Node JS program to connect to SQL table and use WHERE clause

  ## Node JS program to connect to SQL table and use WHERE clause ## 

var mysql = require ('mysql');

// create a connection 
var con = mysql.createConnection({
    host: "localhost",
    user: "admin",
    password: "admin",
    database: "dummy"
});

con.connect(function(err)){
    if (err) throw err;

    con.query("Select * from student where age>15", function (err, result, fields) {
    if (err) throw err;
   
    console.log (" Result is: ", result);
    });
});

Node JS program to delete a text file

 ## Node JS program to delete a text file ##

var fs = require ('fs');

fs.unlink ('file.txt', function (err){
    if (err) throw err;

    console.log (' File deleted successfully!! ');
});

===OUTPUT===

Run the program using the node command:
$ node deleteFile.js
File deleted successfully!! 

Node JS program to connect to sql server

## Node js program to connect to SQL server ##

var express = require ('express');
var app = express();

app.get ('/', function (req,res){
    var sql = require ("mssql");

    // database config
    var config = {
        user: 'admin',
        password: 'admin',
        server: 'localhost',
        database: 'db'
    };

    // Database connectivity
    sql.connect (config, function (err){
        if (err) console.log (err);
        
        //create a request object
        var request = new sql.Request();

        // database query
        request.query (' Select * from student', function (err, record){
        res.send (record);
        });
    });
});

var server = app.listen(3000, function (){
    console.log (' Server running ....');
});

Node JS program to read a text file

 4) Program to read a file from node.js

const fs = require ('fs');

fs.readFile('./test.txt','utf8', (err, data) => {
    if (err) {console.error(err); }

    console.log ("Data is: "+data);
});

Node JS program to create a new file

 3) Create a new text file from Node.js 

var fs = require ('fs');  // include pre-built node file stream module
var data = "Creating a new file";

fs.writeFile('newFile.txt', data, function (err){
    if (err) throw err;
    console.log (" File created successfully"};
});

Run the program in the terminal:
$ node createNewFile.js
File created successfully

Node JS program to create a module

2) Program to create a node module

Let us create a Calculator.js file with add, subtract, and multiply functions ->

// Addition of two numbers
exports.add = function (x, y){
    return x+y;
}

// Subtraction of two numbers
exports.subtract = function (x, y){
    return x-y;
}

// Multiply of two numbers
exports.multiply = function (x,y){
    return x*y;
}

Let us create a new node file to call these functions ->

var calc = require ('./Calculator.js')
var x = 15, y= 10;

console.log (" Addition of two numbers is: "+ calc.add (x,y));
console.log (" Subtraction of two numbers is: "+ calc.subtract (x,y));
console.log (" Multiplication of two numbers is: "+ calc.multiply (x,y));

===OUTPUT===

Addition of two numbers is: 25
Subtraction of two numbers is: 5
Multiplication of two numbers is: 150

Node JS program to create a server

## Program to create a server in node.js language ##

var http = require ('http');
http.createServer( function (req, res) {
    res.writeHead (200, {'Content-type': 'text/plain'});
    res.end ('Hello World!!');
}).listen (8080);

===OUTPUT===

Hello World!!