What is JavaScript?

JavaScript is a versatile, beginner-friendly programming language used to create interactive and dynamic experiences on the web. It works alongside HTML and CSS to build websites, web applications, and other digital tools.

JavaScript is widely used in:

  • Creating interactive and responsive web pages
  • Developing front-end and back-end web applications
  • Automating tasks and working with data from different sources
  • Building data visualizations and interactive graphics

JavaScript’s flexibility, extensive ecosystem, and integration with modern web technologies make it a valuable skill for beginners and experienced developers alike.

Why Learn JavaScript?

Learning JavaScript helps you understand how modern websites and web applications are built while developing skills that can be applied across many areas of programming.

With JavaScript, you can:

  • Add interactivity and functionality to websites
  • Create visualizations that help communicate data and ideas
  • Work with data through APIs and external sources
  • Build tools and applications that make information more accessible

Whether you are interested in web development, data visualization, or creating tools to support research and workflows, JavaScript provides a foundation for building powerful and engaging applications.

Resources for Learning JavaScript

In addition to this guide, there are many open source resources for learning JavaScript.

Here are some of the free resources available organized by category.

Applied / Domain-Specific Resources

Resource Author / Provider Best for (goal) Level
The Javascript Language Javascriptinf Learning how to use JavaScript and its various tools Beginner
D3 by Observable Observable Visualizing Data in JavaScript Intermediate
Introduction to Java Script for Earth Engine Google Earth Learning to use JavaScript for GIS Intermediate
ArcGIS SDK maps for Javascript esri Developer Using JavaScript with Arc GIS services Advanced
Google Earth Engine: Javascript API Google Earth Using Online Data Sources with JavaScript for GIS Advanced
Intro to Data-API's CodingTrain Working with Data and accessing API's in JavaScript Intermediae

Online Courses / Structured Learning Paths

Resource Author / Provider Best for (goal) Level
Learn Javascript Code Academy Learning the Basics of JavaScript Beginner
Building Interactive JavaScript Websites Code Academy Building a website using JavaScript Intermediate

Video Courses / Structured Learning Paths

Resource Author / Provider Best for (goal) Level
Build with Javascript: Project Colorify tapaScript Building an Application with JavaScript Intermediate
JavaScript Full Course Euredeka Learning Basic Coding Concepts in JavaScript New to Programming
« Previous: CSS Fundamentals Next: JavaScript Fundamentals »