What is Deno?

Deno is a next-generation JavaScript runtime developed by Ryan Dahl to address Node.js shortcomings. It stands out with security, TypeScript support, and modern APIs.

Unlike Node.js, Deno is secure by default and requires permissions to access files, network, or environment variables.

TypeScript Support

Deno supports TypeScript by default without any installation required. You can run TypeScript files directly without any compilation step.

In addition to TypeScript, it supports JSX, module URLs, and modern ECMAScript features.

Module System

Deno uses a URL-based module system instead of npm. You can import modules directly from GitHub, deno.land, or other URLs. You can manage module paths with import maps.

URL-based module imports Path management with import maps npm compatibility (npm specifiers) Standard library modules

Popular Frameworks

With Deno, you can build web applications using frameworks like Oak (Express-like), Hono, and Fresh (Next.js-like).

Performance and Security

Deno is built on the V8 JavaScript engine and written in Rust. The sandbox security model ensures code can only access permitted resources. This is especially important when running third-party code.