Getting Started

Deno (/ˈdiːnoʊ/, pronounced dee-no) is an open source JavaScript, TypeScript, and WebAssembly runtime with secure defaults and a great developer experience. It's built on V8, Rust, and Tokio.

Let's create and run your first Deno program in under five minutes.

Install Deno Jump to heading#

Install the Deno runtime on your system using one of the terminal commands below.

curl -fsSL https://deno.land/install.sh | sh

irm https://deno.land/install.ps1 | iex

curl -fsSL https://deno.land/install.sh | sh

Additional installation options can be found here. After installation, you should have the deno executable available on your system path. You can verify the installation by running:

deno --version

Hello World Jump to heading#

Deno can run JavaScript and TypeScript with no additional tools or configuration required. Let's create a simple "hello world" program and run it with Deno.

Create a TypeScript or JavaScript file called main and include the following code:

function greet(name: string): string {
  return `Hello, ${name}!`;
}

console.log(greet("world"));

function greet(name) {
  return `Hello, ${name}!`;
}

console.log(greet("world"));

Save the file and run it with Deno:

$ deno main.ts
Hello, world!

$ deno main.js
Hello, world!

Next Steps Jump to heading#

Congratulations! You've just run your first Deno program. Read on to learn more about the Deno runtime.

• Making a Deno project
• Setting up your environment
• Using the CLI