About Deno
Deno is a runtime for JavaScript and TypeScript, driven through the deno command. It covers script execution along with everyday developer tasks such as testing and formatting. It installs with Homebrew and composes easily with other command-line tools.
Key features
- 01Run TypeScript files directly with deno run main.ts
- 02Execute project tests with deno test
- 03Format source code with deno fmt
- 04Composable CLI interface for scripting and chaining
- 05Cross-platform usage
Use cases
- 01Running and debugging TypeScript scripts locally
- 02Formatting code and running tests before a commit
- 03A coding agent executing scripts and verifying results in a project
- 04Keeping a consistent workflow across different operating systems
Install
Pick your OS or package manager and run the command in a terminal.
Once installed, rundeno --versionto confirm it works.
Example commands
Common commands in the order you’d use them.
Details
From the project READMEDeno
Deno
(/ˈdiːnoʊ/, pronounced
dee-no) is a JavaScript, TypeScript, and WebAssembly runtime with secure
defaults and a great developer experience. It's built on V8,
Rust, and Tokio.
Learn more about the Deno runtime in the documentation.
Installation
Install the Deno runtime on your system using one of the commands below. Note that there are a number of ways to install Deno - a comprehensive list of installation options can be found here.
Shell (Mac, Linux):
curl -fsSL https://deno.land/install.sh | sh
PowerShell (Windows):
irm https://deno.land/install.ps1 | iex
Homebrew (Mac):
brew install deno
Chocolatey (Windows):
choco install deno
WinGet (Windows):
winget install --id=DenoLand.Deno
Scoop (Windows):
scoop install main/deno
Build and install from source
Complete instructions for building Deno from source can be found here.
Your first Deno program
Deno can be used for many different applications, but is most commonly used to
build web servers. Create a file called server.ts and include the following
TypeScript code:
Deno.serve((_req: Request) => {
return new Response("Hello, world!");
});
Run your server with the following command:
deno run --allow-net server.ts
This should start a local web server on http://localhost:8000.
Learn more about writing and running Deno programs in the docs.
Additional resources
- Deno Docs: official guides and reference docs for the Deno runtime, Deno Deploy, and beyond.
- Deno Standard Library: officially supported common utilities for Deno programs.
- JSR: The open-source package registry for modern JavaScript and TypeScript
- Developer Blog: Product updates, tutorials, and more from the Deno team.
Contributing
We appreciate your help! To contribute, please read our contributing instructions.