Skip to main content

Deno Docs

Deno, the open-source runtime for TypeScript and JavaScript. Features built-in dev tools, powerful platform APIs, and native support for TypeScript and JSX.

Get Started Try Deno Deploy

Deno 2.0 is out now! Learn about what has changed in the release.

Deno Runtime

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.

Deno basics

New to Deno? This is the place to start.

Configuration

Customizations for Deno’s built-in TypeScript compiler, formatter, and linter.

Testing in Deno

All about Deno’s built-in test runner for JavaScript or TypeScript code.

More about Testing

Examples

A collection of annotated Deno examples, to be used as a reference for how to build with Deno, or as a guide to learn about many of Deno's features. Find more examples in the Examples section.

Basics

Importing modules from npm Hello World Using Node.js built-in modules Manipulating & Parsing URLs

Network

HTTP Server: Hello World HTTP Server: WebSockets HTTP Server: Streaming TCP Connector: Ping

System and CLI

Command Line Arguments Environment Variables Reading Files Walking directories

Deno Cloud Primitives

KV Queues Cron KV Watch

API reference

Deno, Web, and Node API reference documentation, built for the Deno experience. Explore the APIs available in Deno in the API reference section.

Deno APIs

Cloud FFI Network Permissions WebSockets View all Deno APIs

Web APIs

Cache Canvas Fetch Streams URL View all Web APIs

Node APIs

assert buffer fs path process View all Node APIs

Deno Deploy

Serverless platform for deploying JavaScript code to a fast, global edge network. Supports Deno APIs and Node.js / npm modules

KV

Key/value database built in to the Deno runtime. Simple API, works with zero configuration on Deno Deploy.

Cron

Execute code on a configurable schedule at the edge in any time zone.

Queues

Deno’s queueing API for offloading larger workloads or scheduling tasks with guaranteed delivery.

Subhosting

Deno Subhosting is a robust platform designed to allow Software as a Service (SaaS) providers to securely run code written by their customers.

Quick Start

Configure your subhosting account and you'll be hosting customer code in minutes.

Subhosting architecture

Manage key resources in your systems - handle data, manage deployments and their analytics. All while ensuring stability and efficiency.

Learn about subhosting

REST API

Quickly provision new projects and make deployments through our REST API.

Help

Get help from the Deno team or connect with our community.

Connect with our community

Get help from the Deno community

Enterprise support

Explore Deno's enterprise support options