How to check if ReactJS is installed?

Do you ever find yourself wondering if ReactJS is installed on your system? Is there a simple way to figure out whether it’s already installed or not? What if it’s been installed, but you’re not sure? These are all valid questions that need to be addressed.
The installation of ReactJS can be a bit tricky, especially for tech novices. Without the proper knowledge, many people may find themselves struggling with understanding the installation process. Furthermore, it can be difficult to know whether your system is properly configured and whether all of the required tools are installed correctly. These issues can lead to wasted time and resources, so it is essential to have an effective way to check whether ReactJS has been installed correctly.
In this article, you will learn how to check if ReactJS is installed on your system. We will discuss the various methods to check the installation, whether this be manually through the terminal, using visuse package manager (such as yarn or npm), or through the browser console. We will also discuss how to check for a certain version of ReactJS and how to debug installation issues, should they arise. By the end of the article, you will have the skills to easily and accurately check whether ReactJS has been properly installed and configured, so you are ready to start developing amazing applications using this powerful JavaScript library.


ReactJS is a JavaScript library that was developed by Facebook to create user interfaces as part of the open-source software development process. It is used to create interactive and powerful websites that enhance the user experience. It is also utilized to power mobile apps.
Checking if ReactJS is Installed: This involves downloading and running a command line utility to ensure that React has been correctly installed on a computer. If correctly installed, the command line utility will print out a confirmation message that React has been installed.
ReactJS Benefits: ReactJS is a powerful tool for developers as it allows them to create highly-interactive websites and mobile applications quickly and efficiently. It also performs well in difficult to debug scenarios and is well suited for large-scale application development. Additionally, since it’s open-source, developers can modify the code to their specific needs.
Getting Started: To get started with ReactJS, one should become familiar with the basics of JavaScript programming. It is then recommended that they familiarize themselves with React’s components and APIs. Once comfortable, they can begin to work on creating interactive and dynamic user interfaces and mobile applications.
It is also important to note that ReactJS is just one component of the entire open-source software development process. It is crucial to also become proficient in the fundamentals of HTML, CSS, and web architecture to best maximize ReactJS’ potential.

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1. Overview: What is ReactJS

What is ReactJS?

ReactJS is a JavaScript library used for building user interfaces. It is used by major companies such as Facebook, Instagram, UberEats, Airbnb, and many more. It is open source and was created by Facebook. ReactJS is fast, component-based, and can be used on both the client and server.

How is React Used?

ReactJS is used to develop collaborative, interactive web applications, such as single-page applications. It is used to create components, links, and forms, allowing users to interact with the web page. ReactJS allows developers to quickly and easily create dynamic user interfaces without having to write a lot of code.

Benefits of React

ReactJS has a number of benefits for developers. It is highly efficient, only needing to reload parts of the page instead of the entire page when necessary. It is also easy to maintain and can be used in a variety of different programming languages. Additionally, it provides developers with full control over the user interface and is very responsive.

How to Check if ReactJS is Installed?

To check if ReactJS is installed on your system, type the command “react-scripts –version” in the terminal of your computer. If a version number is displayed, then ReactJS is installed on your system. If there is an error message, then ReactJS is either not installed or it is not in your path.

2. Verifying the Installation of ReactJS

Verifying ReactJS Through Command Line Interface

In order to check if ReactJS is installed, we can start with verifying it through the command line interface. For Windows, the first step would be to open the command prompt by pressing the Windows key+R. Here, we have to enter “cmd” in order to open the command prompt. Once the command prompt is open, the first step is to look for the version of Node.js installed. We can do this by typing the command “node -v”. This should display the version of Node.js installed. After doing this, we have to type the command “npm list -g react” which will show us the version of ReactJS installed. It is important to note that version 16.8 or later is the best version to work with ReactJS.

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Verifying ReactJS Through Package Manager

Apart from verifying the installation of ReactJS through command line interface, we can also verify it through the package manager. For this, we will need to open the package manager from the terminal. Once we open the package manager, all we need to type is “npm ls -g” which will give us the list of packages along with their versions which are installed. We need to look for ReactJS within the package manager which will give us the version which is installed. Another way for verifying the ReactJS installation through the package manager is to type “npm show react version” which will give us the version of ReactJS which is installed.
Both command line interface and the package manager can be used to check and verify if ReactJS is installed. It is always a good practice for developers to verify the version of tools which they are using in order to take advantage of the latest features that are available.

3. Potential Troubleshooting Steps if ReactJS is Not Installed Properly

Identifying ReactJS Installation

It is important to know if ReactJS is properly installed. To do so, you can search the installed programs for something that references ReactJS, such as the Node.js package installer (NPM) or the ReactJS website. It is also beneficial to check the version installed. If it is out of date, then there could be compatibility issues and it could be an underlying cause for issues arising from the application. Additionally, open the file structure of the installed ReactJS application and inspect the project to ensure all the necessary components are present.

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Testing the Installation

As a next step, it is important to test the installation to ensure it works properly. If there are any discrepancies found between the installed and expected versions, they can be addressed by reinstalling and/or updating the applications. To test, create a basic ReactJS application and then run it on a local test server. Keep inspecting the application in the console log to get an idea of how it behaves. Also, be aware that the installation may require its own dependencies and libraries.
Finally, if there are any errors that arise during the test or if the application does not render properly, it is helpful to troubleshoot the individual links back to the root files that are being imported. Pay close attention to any version incompatibility issues that may arise and diagnose the installation based on those details. It may be necessary to reinstall certain components under certain circumstances. By doing these steps, it is possible to confirm that the React Installation has been successful.

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