Deno

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A secure, modern JavaScript and TypeScript runtime created by the original designer of Node.js to fix Node's foundational security and architecture flaws.

What it is

Deno runs TypeScript natively out of the box. Its defining feature is strict security: scripts cannot access the network, file system, or environment variables unless explicitly authorized via command-line flags. It abandons node_modules entirely, importing packages directly via URLs like a web browser.

When you would use it

You use Deno when building server-side applications where strict, granular security permissions and native TypeScript support are critical priorities.

Common operations

• Executing isolated, untrusted third-party scripts securely.
• Building secure edge functions and serverless endpoints.

Related terms

• Node.js
• Bun

Where this is taught

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