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As a ReactJS developer, what languages you need to learn

Website designing and web programming attract a large number of newcomers to the IT world. In my personal opinion, this is due to a fairly low entry threshold. The number of those wishing to become a front-end developer is increasing every year, as a result of which the requirements for candidates are also growing. Especially popular is profession as a ReactJS developer because this library is available for learning almost for everyone and even with a small amount of experience you still can start earning your first serious money.

What technologies and languages do you need to learn to become a ReactJS developer in 2020?

Let me explain to you something. ReactJS is a front-end library, so in order to work in it you need to possess just some simple programming languages like HTML, CSS and, of course, JavaScript. Other knowledge is rather related to different testing platforms and plugins that facilitate the process of web development.

  • Required languages to learn: HTML5 & CSS3

HTML5 and CSS3 are fundamental technologies that any web developer must know. Using the HTML (hypertext markup language), the markup (skeleton) of each web page is created. Then the CSS style language transforms the site and gives it an attractive and effective look.

You also need to own:

  • cross-browser responsive layout to be able to create websites for mobile devices, tablets and large-format screens and for various browsers;
  • semantic layout to improve the quality of markup and improve the search indexing of the site.

A good knowledge of HTML and CSS already allows you to do site layout and start making money with the help of ReactJS. It is with these two basic technologies that the path to the profession of ReactJS developer begins.


  • Bootstrap 4

A popular HTML / CSS platform for developing responsive web applications, which is used to create sites and interfaces for admin panels. The main benefits of Bootstrap are:

  • high speed of layout;
  • cross-browser and cross-platform;
  • the presence of good documentation, a large community and a huge variety of training materials;
  • low threshold of entry (you only need to know the basics of HTML, CSS, JavaScript and jQuery).


  • JavaScript

This is a programming language that is used both in the development of the client side of a web application and the server side. You definitely need to learn it because React itself is written on JavaScript. With JavaScript (abbreviated as JS), you can even write desktop (desktop) and mobile applications using certain software platforms and libraries. This language allows you to:

  • dynamically change the markup;
  • carry out interactive interaction with the user;
  • animate images;
  • perform form validation;
  • manage media, etc.

In other words, JavaScript animates the page and adds functionality to it. A good command of this programming language is a must for every front-end developer.

JavaScript has long been used not only to develop dynamic user interfaces, but also to write fairly complex business logic. Therefore, knowledge of algorithms and data structures becomes critical for JS developers.

JavaScript uses the official ECMAScript standard (ES for short), which implies some formal description of syntax, underlying objects, and algorithms. There are many different versions of ES at the moment. Employers most often require ES6 knowledge.

However, you first need to learn pure JavaScript and only then delve into the new standards. Whatever one may say, one should know the classics. With a good command of JS, you can quickly understand any version of ES and then master any framework or library.

  • Other JavaScript frameworks


Although ReactJS has a lot of advantages, it will be a great plus for you to know how to work in other frameworks.

These are the tools with which you can create dynamic web / mobile / desktop applications in JavaScript. They accelerate the development of web applications and provide a well-structured code organization, improving its quality and cleanliness.

The most popular front-end frameworks except ReactJS are Vue.js and Angular. Each of them is designed to solve its own spectrum of tasks and has a different degree of complexity: Vue.js has the easiest learning curve (but also with the smallest community), Angular is of high complexity. It is worth concentrating on a deep study of one framework, but at the same time it is highly recommended to know the features and scope of all of the above technologies.

What else is important to know as a ReactJS developer?


  • CSS preprocessors

A CSS preprocessor is a program that has its own syntax, but can generate CSS code from it. The most popular are SASS, Stylus, LESS and PostCSS, however, SASS has the largest community. Preprocessors are intended for:

  • speeding up the process of writing code;
  • simplification of code reading and its further support;
  • minimization of routine work when writing code.

To improve the efficiency of writing CSS code, learning only one preprocessor will be sufficient.

  • Git

This is the most popular distributed version control system that allows you to keep the history of project development with the ability to access each saved version. Thus, if the process of creating a software product began to malfunction, it is possible to return to the previous working version instead of a long search for errors.

Also, version control systems are an integral tool for team development, which allows developers to work on one project at the same time, saving the changes made. At the same time, it is convenient to track the progress of tasks by each member of the team. A very important tool for any ReactJS developer.


  • jQuery

A small, fast and feature-rich JavaScript library that requires basic knowledge of HTML, CSS, and JavaScript. It is designed to simplify JS programming. This library presents voluminous solutions to common problems in the form of methods that are called by one line of code.

Although jQuery is losing popularity, giving way to JS frameworks, a large number of sites still use this library. Front-End developers working in the office do not always create new websites – existing ones need to be maintained and updated. Here you cannot do without knowledge of jQuery.

  • JavaScript Core (DOM, AJAX, JSON)

DOM (Document Object Model) is an object representation of the original HTML document. The key concept is the DOM tree, which describes the structure of the page. With the help of the object model, JavaScript gains complete control over the HTML document: the ability to edit, delete, and add HTML elements and attributes, change CSS code, and so on.

AJAX (Asynchronous JavaScript And XML) is a synthesis of JavaScript and XML technologies, which is actually a combination of:

  • an XMLHttpRequest object built into the browser (to request data from a web server);
  • JavaScript and HTML DOM (to display or consume data).

AJAX allows web pages to update asynchronously by exchanging data with the web server. Thanks to this technology, the page does not need to be reloaded – only a specific part of it is updated (remember the news feed on social networks).

JSON (JavaScript Object Notation) is a general data interchange format. Allows you to exchange information between software products written in different languages. This way, a client using JavaScript can easily transfer data to a server that is implemented with Ruby / Java / PHP.

All three technologies are of particular value to every web developer and reveal the organization of the Internet application.

  • BEM

“Block, Element, Modifier” is a methodology that provides a component approach to the development of web pages, which is based on the principle of dividing the interface into independent blocks. The BEM approach allows you to reuse existing code in the creation of other pages while preserving all its properties (size, font, color, etc.).

  • Webpack

A powerful module builder that allows you to compile several different modules into one file. Used when working on large projects. It is successfully used in both front-end development and back-end applications.

  • Flex and Grid CSS

Layout technologies for reliable responsive web pages that make it easier to create dynamic sites and more conveniently structure their content. The Flex layout in action is best shown by the interactive site, while the grid layout is shown by

  • Gulp / Grunt

Build systems that automate the routine tasks of developers: code minification, image optimization, testing, code quality analysis, etc. Suitable for developing small projects.

  • TypeScript

A cross-platform strongly typed language that extends JavaScript. Strong typing helps reduce potential errors in your TypeScript source code. Also, this language implements concepts that are close to object-oriented languages ​​such as C #, Java and the like. TypeScript improves the speed and ease of writing complex, complex programs, making them easier to maintain, scale, and test.

  • SVG

Scalable vector graphics markup language. Images on the page made with SVG are displayed correctly on screens with different resolutions without losing their quality, unlike traditional raster .jpeg, .png and others.

  • English

Knowledge of the English language is one of the main requirements for a front-end ReactJS developer, since a large amount of useful information is located on English-language sites. The level of reading technical documentation will be sufficient for comfortable use of foreign resources.

If you are in search for a job as a ReactJS developer, be ready to meet such particular requirements as written below:

  • 1+ year of commercial development experience with React.js;
  • Experience with Redux, Redux-Saga, Redux Form, React Router;
  • Experience with standard layout;
  • Deep knowledge of HTML, CSS. JavaScript;
  • Strong knowledge of JS ES6 / ES7;
  • Understanding the principles of developing SPA applications;
  • Experience with SCSS;
  • Knowledge of related tools Git, NPM, Webpack;
  • Having a portfolio on github.
  • Knowledge of TypeScript;
  • Experience with Ant Design;
  • Experience with Reselect;
  • Experience with CSS-in-JS and CSS-modules;
  • Working with Jira;
  • Understanding BEM;
  • Understanding WebSockets;
  • Having a Pet project is more difficult than Todolist.
  • Development of new SPA applications;
  • Support for existing projects.

That’s it. Do not be a scaredy-cat and be brave enough to accept challenges because there will be numerous of them on your programming path. Constant learning and self-development is the key to success. Thank you for reading this and good luck!