Deno Runtime Essentials
Explore Deno's core features, built-in tooling, and how it differs from Node.js.
Welcome to Deno Essentials
Welcome! In this lesson, we'll dive into Deno, a modern, secure runtime for JavaScript and TypeScript.
Created by Ryan Dahl (who also created Node.js), Deno addresses some of the design choices made in Node.js, focusing on security and a great developer experience.
Security First: Deno's Approach
One of Deno's biggest differences is its security model. By default, Deno scripts run in a sandbox, meaning they have no access to:
- The file system
- The network
- Environment variables
- Subprocesses
You must explicitly grant these permissions using command-line flags. This prevents malicious code from doing harm without your knowledge.
All lessons in this course
- Deno Runtime Essentials
- Module System & Permissions
- Developing Local Deno Apps
- Testing Deno Applications