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denoland/deno

A JavaScript, TypeScript, and WebAssembly runtime with secure defaults, built on V8, Rust, and Tokio.

Open-source alternative to:Node.js

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What is it?

Deno is a runtime for running JavaScript, TypeScript, and WebAssembly programs outside the browser. It is built on V8 for execution, Rust for the native layer, and Tokio for asynchronous I/O. Programs run with secure defaults: network, file, and environment access must be granted explicitly through flags such as --allow-net.

TypeScript runs directly without a separate compile step, and the runtime ships with a built-in toolchain. The project also provides the official Deno Standard Library and JSR, a package registry for modern JavaScript and TypeScript. Deno is most often used to build web servers, and the command deno run --allow-net server.ts starts an HTTP server with a few lines of code.

Installation is available through shell scripts, Homebrew, Chocolatey, WinGet, and Scoop, and the project can also be built from source.

Key features

  • 01Runs JavaScript, TypeScript, and WebAssembly without a separate build step.
  • 02Denies file, network, and environment access by default unless explicitly allowed.
  • 03Built on V8, Rust, and Tokio.
  • 04Includes a built-in web server API via Deno.serve.
  • 05Ships with the official standard library and integrates with the JSR package registry.

Use cases

  • Building HTTP servers and web APIs with minimal setup.
  • Running TypeScript scripts and tools without a Node.js toolchain.
  • Deploying sandboxed programs that need restricted system access.
  • Using JSR and the standard library in new JavaScript or TypeScript projects.

Quick start

  1. 1

    Install Deno with Homebrew (Mac)

    brew install deno
  2. 2

    Install Deno with Chocolatey (Windows)

    choco install deno
  3. 3

    Create server.ts with the Deno.serve hello world program from the README

  4. 4

    Run the server with network permission

    deno run --allow-net server.ts

Things to know

  • The README's shell and PowerShell installers pipe remote scripts into a shell, so a package-manager install is safer.

Topics

#javascript#typescript#runtime#webassembly#rust#web-server#security#deno

FAQ

What is deno?
A JavaScript, TypeScript, and WebAssembly runtime with secure defaults, built on V8, Rust, and Tokio. Deno is a runtime for running JavaScript, TypeScript, and WebAssembly programs outside the browser. It is built on V8 for execution, Rust for the native layer, and Tokio for asynchronous I/O. Programs run with secure defaults: network, file, and environment access must be granted explicitly through flags such as --allow-net.
Is deno free to use? What license does it have?
deno is open source under the MIT license. Check the license terms before using it in commercial products.
Is deno still maintained?
Actively maintained. The last commit to deno was on Oct 20, 2026.
What can I use deno for?
Building HTTP servers and web APIs with minimal setup. Running TypeScript scripts and tools without a Node.js toolchain. Deploying sandboxed programs that need restricted system access. Using JSR and the standard library in new JavaScript or TypeScript projects.
How do I install deno?
Install Deno with Homebrew (Mac): brew install deno Install Deno with Chocolatey (Windows): choco install deno Create server.ts with the Deno.serve hello world program from the README Run the server with network permission: deno run --allow-net server.ts
Where can I get deno?
The source code and installation instructions are on GitHub: https://github.com/denoland/deno

Summary generated by AI from the project's README. GitHub stats refresh daily.

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