How to convert Array to JSON Object JavaScript

What is JSON?

JSON means JavaScript Object Notation. JSON is an extremely lightweight data-interchange format for data exchange between server-side and client side which is quick and easy to parse and generate.

1. Convert Array to JSON Object JavaScript

You can use JSON.stringify to convert an array into a JSON formatted string in JavaScript.

Suppose there is an array such as “[1, 2, 3, 4]”. If you want to convert this array to JSON Object in javascript. Let’s see the example below

Ex:-

var array = [1, 2, 3, 4]; 
var arrayToString = JSON.stringify(Object.assign({}, array));  // convert array to string
var stringToJsonObject = JSON.parse(arrayToString);  // convert string to json object
 
console.log(stringToJsonObject);

Here,

• 1.JSON.stringify() and Object.assign() method convert array to JSON string.
• 2.JSON.parse() method convert string to JSON object in javascript.

2. Converting an Object to an Array

When converting an object to an array, we’ll use the .entries() method from the Object class. This will convert our object to an array of arrays. Each nested array is a two-value list where the first item is the key and the second item is the value.

Ex:-

var object = {
   "first_name": "Test",
   "last_name": "Test",
   "email": "test@gmail.com"
}
var arr = Object.entries(object);
 
console.log(arr);

3. Convert two dimensional ( 2d ) arrays to JSON Object JavaScript

Suppose there is an array such as

var arr = [
    ["Status", "Name", "Marks", "Position"], 
    ["active", "Akash", 10.0, "Web Developer"],
    ["active", "Vikash", 10.0, "Front-end-dev"],
    ["deactive", "Manish", 10.0, "designer"],
    ["active", "Kapil", 10.0, "JavaScript developer"],
    ["active", "Manoj", 10.0, "Angular developer"],
];

If you want to convert this array to JSON Object in javascript. Let’s see the example below :

Ex:-

//array.
var arr = [
    ["Status", "Name", "Marks", "Position"], 
    ["active", "Akash", 10.0, "Web Developer"],
    ["active", "Vikash", 10.0, "Front-end-dev"],
    ["deactive", "Manish", 10.0, "designer"],
    ["active", "Kapil", 10.0, "JavaScript developer"],
    ["active", "Manoj", 10.0, "Angular developer"],
];
 
//javascript create JSON object from two dimensional Array
function arrayToJSONObject (arr){
    //header
    var keys = arr[0];
 
    //vacate keys from main array
    var newArr = arr.slice(1, arr.length);
 
    var formatted = [],
    data = newArr,
    cols = keys,
    l = cols.length;
    for (var i=0; i<data.length; i++) {
            var d = data[i],
                    o = {};
            for (var j=0; j<l; j++)
                    o[cols[j]] = d[j];
            formatted.push(o);
    }
    return formatted;
}

#JavaScript #JSON

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How to Find Ulimit For user on Linux

How can I find the correct ulimit values for a user account or process on Linux systems?

For proper operation, we must ensure that the correct ulimit values set after installing various software. The Linux system provides means of restricting the number of resources that can be used. Limits set for each Linux user account. However, system limits are applied separately to each process that is running for that user too. For example, if certain thresholds are too low, the system might not be able to server web pages using Nginx/Apache or PHP/Python app. System resource limits viewed or set with the NA command. Let us see how to use the ulimit that provides control over the resources available to the shell and processes.

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MEAN Stack Tutorial MongoDB ExpressJS AngularJS NodeJS

We are going to build a full stack Todo App using the MEAN (MongoDB, ExpressJS, AngularJS and NodeJS). This is the last part of three-post series tutorial.

MEAN Stack tutorial series:

AngularJS tutorial for beginners (Part I)
Creating RESTful APIs with NodeJS and MongoDB Tutorial (Part II)
MEAN Stack Tutorial: MongoDB, ExpressJS, AngularJS and NodeJS (Part III) 👈 you are here
Before completing the app, let’s cover some background about the this stack. If you rather jump to the hands-on part click here to get started.

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How to configure AWS SES with Postfix MTA

How do I configure Amazon SES With Postfix mail server to send email under a CentOS/RHEL/Fedora/Ubuntu/Debian Linux server?

Amazon Simple Email Service (SES) is a hosted email service for you to send and receive email using your email addresses and domains. Typically SES used for sending bulk email or routing emails without hosting MTA. We can use Perl/Python/PHP APIs to send an email via SES. Another option is to configure Linux or Unix box running Postfix to route all outgoing emails via SES.

• » Remove sendmail
• » Install postfix
• » Configuring postfix for SES
• » Test postfix

Procedure to configure AWS SES with Postfix

Before getting started with Amazon SES and Postfix, you need to sign up for AWS, including SES. You need to verify your email address and other settings. Make sure you create a user for SES access and download credentials too.

Step 1 – Uninstall Sendmail if installed

If sendmail installed remove it. Debian/Ubuntu Linux user type the following apt command/apt-get command:

$`` sudo apt --purge remove sendmail

CentOS/RHEL user type the following yum command or dnf command on Fedora/CentOS/RHEL 8.x:

$`` sudo yum remove sendmail

$`` sudo dnf remove sendmail

Sample outputs from CentOS 8 server:

Dependencies resolved.
===============================================================================
 Package           Architecture  Version               Repository         Size
===============================================================================
Removing:
 sendmail          x86_64        8.15.2-32.el8         @AppStream        2.4 M
Removing unused dependencies:
 cyrus-sasl        x86_64        2.1.27-1.el8          @BaseOS           160 k
 procmail          x86_64        3.22-47.el8           @AppStream        369 k

Transaction Summary
===============================================================================
Remove  3 Packages

Freed space: 2.9 M
Is this ok [y/N]: y

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systemctl List All Failed Units/Services on Linux

Is there is a command to print list all failed units or services when using systemd on Linux? Can you tell me the systemctl command to list all failed services on Linux?

This quick tutorial explains how to find/list all failed systemd services/units on Linux operating systems using the systemctl command.

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Docker Applikationen mit Visual Studio Code debuggen

Mit dem integrierten Debugger von Visual Studio Code lassen sich ASP.NET Core bzw. .NET Core Applikationen einfach und problemlos debuggen. Der Debugger unterstützt auch Remote Debugging, somit lassen sich zum Beispiel .NET Core Programme, die in einem Docker-Container laufen, debuggen.

Als Beispiel Applikation reicht das Default-Template für MVC Applikationen dotnet new mvc

$ md docker-core-debugger
$ cd docker-core-debugger
$ dotnet new mvc

Mit dotnet run prüfen wir kurz, ob die Applikation läuft und unter der Adresse http://localhost:5000 erreichbar ist.

$ dotnet run
$ Hosting environment: Production
$ Content root path: D:\Temp\docker-aspnetcore
$ Now listening on: http://localhost:5000

Die .NET Core Applikation builden wir mit dotnet build und publishen alles mit Hilfe von dotnet publish

$ dotnet build
$ dotnet publish -c Debug -o out --runtime linux-x64

Dabei gilt es zu beachten, dass die Build Configuration mit -c Debug gesetzt ist und das Output Directory auf -o out. Sonst findet Docker die nötigen Binaries nicht. Für den Docker Container brauchen wir nun ein Dockerfile, dass beim Start vorgängig den .NET Core command line debugger (VSDBG) installiert. Das Installations-Script für VSDBG ist unter https://aka.ms/getvsdbgsh abfrufbar.

FROM microsoft/aspnetcore:latest
WORKDIR /app

RUN apt-get update \
    && apt-get install -y --no-install-recommends \
       unzip procps \
    && rm -rf /var/lib/apt/lists/* \
    && curl -sSL https://aka.ms/getvsdbgsh | bash /dev/stdin -v latest -l /vsdbg

COPY ./out .
ENTRYPOINT ["dotnet", "docker-core-debugger.dll"]

Den Docker Container erstellen wir mit dem docker build Kommando

$ docker build -t coreapp .

und starten die Applikation mit docker run.

$ docker run -d -p 8080:80 --name coreapp coreapp

Jetzt muss Visual Studio Code nur noch wissen, wo unsere Applikation läuft. Dazu definieren wir eine launch.json vom Typ attach und konfigurieren die nötigen Parameter für den Debugger.

{
    "version": "0.2.0",
    "configurations": [
         {
            "name": ".NET Core Remote Attach",
            "type": "coreclr",
            "request": "attach",
            "processId": "${command:pickRemoteProcess}",
            "pipeTransport": {
                "pipeProgram": "docker",
                "pipeArgs": ["exec", "-i coreapp ${debuggerCommand}"],
                "quoteArgs": false,
                "debuggerPath": "/vsdbg/vsdbg",
                "pipeCwd": "${workspaceRoot}"
            },

            "logging": {
                "engineLogging": true,
                "exceptions": true,
                "moduleLoad": true,
                "programOutput": true
            },
        }
    ]
}

Mit F5 starten wir den Debugger. Wenn alles klappt, sollte eine Auswahl der Prozesse des Docker-Containers sichtbar sein.

Nun muss der dotnet Prozess ausgewählt werden. Der Visual Studio Code Debugger verbindet sich darauf mit VSDBG und wir können wie gewohnt unseren Code debuggen. Dazu setzen wir einen Breakpoint in der Index-Action des HomeControllers und rufen mit dem Browser die URL http://localhost:8080/ auf.

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