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Deno is a runtime environment for JavaScript and TypeScript. Since it’s built to improve upon the earlier version of Node.js, Deno offers significant upgrades to improve security and real-world performance while offering developers modern instrumentation.

In this course, you’ll discover Deno’s main features and explore its similarities and differences in relation with Node.js. You’ll then be led through a series of detailed project examples and practical code exercises to master its runtime.

By the end of the course, you’ll be ready to create professional, highly performant JavaScript or TypeScript applications with Deno.

Master the Deno JavaScript Runtime

This lesson takes inspiration from an article written by Luca Casonato on Deno’s blog (see the [Appendix: Further Resources](https://www.educative.io/courses/master-deno-javascript-runtime/appendix-further-resources) for the link). Here we’ll learn some useful Deno APIs (only a small subset). Each of them, provide us a code widget to experiment with these APIs directly.

## Encoding/Decoding (base64)
We can encode/decode base64 strings with the `atob` and `btoa` functions.

This lesson takes inspiration from an article written by Luca Casonato on Deno’s blog (see the [Appendix: Further Resources](https://www.educative.io/courses/master-deno-javascript-runtime/appendix-further-resources) for the link). Here we’ll learn some useful Deno APIs (only a small subset). Each of them, provide us a code widget to experiment with these APIs directly.

# Encoding/Decoding (base64)
We can encode/decode base64 strings with the `atob` and `btoa` functions.

Explore and test some Web APIs supported by Deno to achieve some common tasks.

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Deno Web APIs

Encoding/Decoding (base64)