Zabbix is open-source monitoring software for networks and applications. In this tutorial, you will configure a Zabbix-based monitoring system on two Ubuntu 20.04 machines. One will be configured as the server, and th...

In React, state refers to a structure that keeps track of how data changes over time in your application. Managing state is a crucial skill in React because it allows you to make interactive web applications. In this ...

The 2015 edition of the ECMAScript specification (ES6) added template literals to the JavaScript language. Template literals are a new form of making strings in JavaScript that add a lot of powerful new capabilities, ...

In this article, you will use a debugger to debug some sample Node.js applications. You will first debug code using the built-in Node.js debugger tool, setting up watchers and breakpoints so you can find the root caus...

In this tutorial, you'll learn three different ways to style React components: plain Cascading Style Sheets (CSS), inline styles with JavaScript-style objects, and JSS, a library for creating CSS with JavaScript. To i...

TimescaleDB is an open-source database optimized for storing time-series data. It is implemented as an extension of PostgreSQL and combines the ease-of-use of relational databases and the speed of NoSQL databases. By ...

Event emitters are objects in Node.js that trigger an event by sending a message to signal that an action was completed. In this article, you will create an event listener for a TicketManager JavaScript class that all...

Grafana is an open-source data visualization and monitoring tool that integrates with complex data sources like Prometheus and ElasticSearch. Grafana lets you create alerts, notifications, and ad-hoc filters for your ...

In this tutorial, you'll create wrapper components with props using the React JavaScript library. Wrapper components are components that provide a default structure to display the child components. This pattern is use...

In this CentOS 7 tutorial, you'll learn how to run multiple web applications on the same Docker host using the reverse proxy Traefik to route requests to separate containers and review container health on a monitoring...

Introduced in ECMAScript 2015 (ES6), destructuring, rest parameters, and spread syntax provide more direct ways of accessing the members of an array or an object, and can make working with data structures quicker and ...

Props are arguments that you provide to a JSX element in a React application. They look like standard HTML props, but they aren't predefined and can have many different JavaScript data types, including numbers, string...

A buffer is a space in memory (typically RAM) that stores binary data. In Node.js, we can access these spaces of memory with the built-in Buffer class. Buffers are useful when using JavaScript to interacting with bina...

Drupal is a content management system (CMS) written in PHP and distributed under the open-source GNU General Public License. Drupal requires the LAMP (Linux, Apache, MySQL, and PHP) or LEMP (Linux, Nginx, MySQL, and ...

Custom components are independent pieces of functionality that you can reuse in your code, and are the building blocks of all applications built on the React framework. Often, they can be simple JavaScript functions a...

JSX is an abstraction that allows you to write HTML-like syntax in your JavaScript code and will enable you to build React components that look like standard HTML markup. Since you are also writing JavaScript, you’ll ...

Node.js allows developers to use JavaScript to write back-end code, even though traditionally it was used in the browser to write front-end code. Having both the frontend and backend together like this reduces the eff...

In ECMAScript 2015, default function parameters were introduced to the JavaScript programming language. These allow developers to initialize a function with default values if the arguments are not supplied to the func...

Starting a new JavaScript project with React used to be a complicated process. But now, Create React App includes all the JavaScript packages you need to run a React project, including code transpiling, basic linting,...

GraphQL is an API standard created and open-sourced by Facebook as an alternative to REST APIs. It exposes a single endpoint for all communication instead of multiple URLs for different resources and solves the overfe...