Deno 2.9
`deno desktop` for building native desktop apps from web tech, first-class migration from npm/pnpm/yarn/Bun, CSS module imports, snapshot and parameterized testing, smaller `deno c...
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Deno
Latest entries from Deno.
Deno 2.8
`import defer`, six new subcommands (`deno transpile`, `deno pack`, `deno bump-version`, `deno ci`, `deno why`, `deno audit fix`), network debugging in Chrome DevTools, framework-a...
Claw Patrol: an open-source security firewall for agents
Why we needed an agent firewall that speaks more than HTTP.
Fresh 2.3: Zero JS by default, View Transitions, and Temporal support
Fresh 2.3 ships true zero-JS pages, View Transitions, CSP nonce support, IP filtering, and Temporal API support in islands.
Deno 2.7: Temporal API, Windows ARM, and npm overrides
Deno 2.7 stabilizes the Temporal API, adds Windows on ARM builds, npm overrides in package.json, brotli compression streams, self-extracting compiled binaries, deno create, and doz...
Build a dinosaur runner game with Deno, pt. 6
Add structured logging, distributed traces, and game analytics to your Deno game and learn how to use Deno Deploy's built-in logs, traces, and metrics dashboards.
Build a dinosaur runner game with Deno, pt. 5
Capture player identities, add a customization modal, and persist those preferences via Oak + PostgreSQL.
Deno Deploy is Generally Available
Deno Deploy is now generally available, plus some highlights of new features and tools.
Introducing Deno Sandbox
Instant Linux microVMs with defense-in-depth security for running untrusted code.
Build a dinosaur runner game with Deno, pt. 4
Building a leaderboard with database integration for our example browser-based game.
Build a dinosaur runner game with Deno, pt. 3
Adding obstacles, collision detection and game mechanics to our example browser-based game.
Build a dinosaur runner game with Deno, pt. 2
This series of posts will guide you through building a simple game using Deno. This post sets up the game loop, user controls and basic game physics.
React / Next.js Denial-of-Service Vulnerability: Deno Deploy users protected
A high severity Denial-of-Service (DoS) vulnerability has been found in React Server Components and Next.js. Deno has implemented mitigations in Deno Deploy. Immediate upgrades are...
Deno 2.6: dx is the new npx
This release includes `dx` for running package binaries, more granular permissions, source phase imports, faster type checking with `tsgo`, native source maps, `deno audit`, and mu...
Build a dinosaur runner game with Deno, pt. 1
This series of posts will guide you through building a simple game using Deno. Each post corresponds to a stage in the development process, gradually introducing new features and c...
React Server Functions / Next.js Vulnerability: Deno Deploy users protected
A critical Remote Code Execution (RCE) vulnerability has been found in React Server Functions and Next.js. Deno has implemented mitigations in Deno Deploy. Immediate upgrades are r...
My highlights from the new Deno Deploy
Highlights from the new version of Deno Deploy.
Deno's Other Open Source Projects
Here’s a roundup of some of our popular open source libraries and how we use them in Deno.
How Deno protects against npm exploits
Recent supply chain attacks on npm is a reminder that Node and npm grants unfettered access to your systems. Here's how Deno, with an opt-in security model, protects against these ...
Help Us Raise $200k to Free JavaScript from Oracle
Our legal battle over Oracle's claim on the word "JavaScript" is entering the discovery phase. Here's how you can help.
Deno 2.5: Permissions in the config file
Simpler permission management with permission sets, new Deno.test APIs for setting up and tearing down test cases, specifying custom headers in WebSocket connections, runtime APIs ...
Fresh 2.0 Graduates to Beta, Adds Vite Support
Fresh 2.0 beta introduces optional Vite integration - with hot reloading, faster boot times, seamless React aliasing, and the full Vite plugin ecosystem
Deno 2.4: deno bundle is back
Deno bundle is back, alongside the addition of bytes and text imports, stabilized built-in OpenTelemetry, a new --preload flag, simplified dependency management with deno update, a...
JavaScript™ Trademark Update
The Trademark Trial and Appeal Board has dismissed our fraud claim against Oracle. We disagree with this decision.
What's coming to JavaScript
Here are proposals that were advanced at the last TC39 meeting and what that means for the future of JavaScript.
A brief history of JavaScript
In 30 years, JavaScript went from being a little scripting language to one of the world's most popular. Here are key moments to show how it has evolved and where it is headed.
Reports of Deno's Demise Have Been Greatly Exaggerated
Addressing recent Deno criticisms and sharing our vision for the future
An Update on Fresh
Fresh 2.0 is very much still active. Here’s an update and how to try out the alpha.
How Plaid migrated 100 services to a new database platform 5x faster with Deno
Learn how Plaid used Deno to minimize downtime and improve cutover speed during a critical infrastructure migration.
Deno 2.3: Improved deno compile, local npm packages, and more
Deno 2.3 adds new features for deno compile and deno fmt, support for using local npm packages, several performance improvements, and more. Here are the biggest highlights.
Add JSR packages with pnpm and Yarn
You can now access JSR packages via pnpm and Yarn. Here's how.
Zero-config Debugging with Deno and OpenTelemetry
Debugging requires implementation to get the right data for you to resolve issues quickly. Here's how you can use Deno to capture necessary telemetry data without any additional wo...
Exploring Art with TypeScript, Jupyter, Polars, and Observable Plot
With Deno's Jupyter support, you can explore, interact, and create interactive charts with TypeScript and HTML. Here's a tutorial featuring data of over 130,000 famous artworks.
Deno v Oracle Update 3: Fighting the JavaScript Trademark
Oracle has filed a partial motion to dismiss our fraud claim. We’re now waiting on the USPTO to weigh in.
Build a custom RAG AI agent in TypeScript and Jupyter
AI and LLMs are certainly useful assistive tools. But what if we need to train LLMs on confidential documents and materials? Here's how you can build your own custom RAG AI agent.
How to get deep traces in your Node.js backend with OTel and Deno
Adding meaningful tracing to a Node backend requires additional instrumentation and configuration. Here’s another approach that requires zero additional code.
toranoana.deno #20 登録受付中(2025年3月14日)
Deno は東京で行われるミートアップ toranoana.deno #20 に開催協力します。以下、主な詳細とスケジュールの概要です。
Node just added TypeScript support. What does that mean for Deno?
Node's experimental TypeScript support will be stabilized in 23.6. Here's what Node's TypeScript integration looks like and how it compares to Deno.
The Dino 🦕, the Llama 🦙, and the Whale 🐋
Did you know you can run a large language model with Deno and Jupyter Notebooks? Here's how.
Publish a lint rule, get a prize
Deno's new lint plugin system means you can extend the deno lint functionality with your own rules. We're giving prizes for anyone who publishes a lint rule this week. Here's how t...
Deno 2.2: OpenTelemetry, Lint Plugins, node:sqlite
Deno 2.2 adds built-in OpenTelemetry, a new linter plugin API, node:sqlite, and major improvements to deno check, deno lsp, and deno task.
If you're not using npm specifiers, you're doing it wrong
One common way to import npm packages is with transpile services like esm.sh or unpkg.com, which converts npm modules to esm and hosts them on the web. However, since Deno 2, which...
How Deno's documentation is evolving
Documentation is a critical part of developer experience. Here's how we're improving our documentation and what's to come.
Oracle justified its JavaScript trademark with Node.js—now it wants that ignored
Oracle filed a motion to dismiss in response to Deno’s petition to cancel its “JavaScript” trademark. But instead of addressing the real issue—that JavaScript is an open standard w...
Introducing the JSR open governance board
JSR, a modern open source JavaScript registry, is meant for the greater JavaScript and TypeScript community. We're thrilled to announce its own independent governing body.
Intro to Wasm in Deno
Web Assembly, or Wasm, is a great way to increase performance in your web application. Here is an introductory guide to what it is and how you can use it.
Announcing OpenAI on JSR
OpenAI, leading development platform for building generative AI products and experiences, now has a JavaScript and TypeScript SDK on JSR.
Deno in 2024
We had a busy 2024 with the launch of Deno 2 and JSR, and dozens of features to simplify programming. Here are the biggest updates in 2024 and what's on the horizon.
Goodbye WinterCG, welcome WinterTC
WinterCG, the Web Interoperable Runtimes Community Group is moving to Ecma as TC55 to be able to publish standards.
Build a SolidJS app with Deno
Learn how to build a simple SolidJS application with Deno.
Run your Next.js SSR app on Deno Deploy
Here's how to get your Next.js SSR project up and running on Deno Deploy.
Solve Advent of Code 2024 with Deno and Win Prizes!
We're giving out exclusive prizes for using Deno during the Advent of Code 2024. Here's what you can win.
Deno v. Oracle: Canceling the JavaScript Trademark
Oracle is holding the JavaScript trademark hostage, and we’re pursuing legal means to #FreeJavaScript. Here’s a brief update.
Deno 2.1: Wasm Imports and other enhancements
Deno 2.1 introduces first-class Wasm imports, built-in tracing with OpenTelemetry, faster `deno compile`, and improved package management.
Build a Typesafe API with tRPC and Deno
Learn how to build a typesafe API with tRPC and Deno.
Self-contained Executable Programs with Deno Compile
Deno compile is a flexible tool that turns a JavaScript or TypeScript program into a portable, streamlined binary for any OS. Here's how it works.
Build a Database App with Drizzle ORM and Deno
Using an object-relational mapping (ORM) database can make working with persistent data simpler. Here's how to use a popular ORM, Drizzle, with Deno.
Introducing your new JavaScript package manager: Deno
Deno’s new package manager, added in v2.0, is fast, flexible, and supports Node and package.json. Here’s how it works.
Announcing Growthbook on JSR
Growthbook's JavaScript SDK, which enables easy AB testing and personalization, is now available on JSR.
Build an Astro site with Deno
Learn how to build a server-rendered website with Astro and Deno.
How to convert CommonJS to ESM
Here’s a thorough guide that covers everything you need to know to migrate your CommonJS project to ESM.
Announcing Deno 2
Our next major version of Deno combines the simplicity, security, and performance of Deno 1 with full Node and npm backwards compatibility, and much more.
The Final Touches: What’s New In v2.0.0-rc.10
We've merged in many fixes and improvements to the Deno 2 release candidate. Here's what's new.
Announcing Stable V8 Bindings for Rust
Rusty V8, a library that provides high-quality, zero-overhead Rust bindings to V8, is finally stable. Here's how to use it.
Deno 2.0 Release Candidate
This release candidate, a near-final look at Deno 2, includes the addition of Node's process global, better dependency management, and various API stabilizations, and more.
Secure, efficient private npm registries with Cloudsmith and Deno
Deno can use private npm registries with Cloudsmith, which offers additional security features, analytics into module usage, and more. Here’s how to do it.
Painting the Plane as We Fly It: Designing JSR
JSR, created for the JavaScript community, needed a logo and a website to look distinct, friendly, and inclusive. Here's how we approached this design problem.
Introducing Web Cache API support on Deno Deploy
The Web Cache API offers sub-millisecond read latency, multi-Gbps write throughput, and unbounded storage. Here’s how you can use it.
Deno 1.46: The Last 1.x Release
Our last 1.x release before Deno 2 comes with a ton of features, ranging from a simpler, improved CLI, to multi-threaded web servers, improvements to Node.js/npm compatibility, and...
Protect your cloud spend with new Deno Deploy spend limits
You can now exercise greater control over your Deno Deploy spend with our new spend limits. Here’s how they work.
What we got wrong about HTTP imports
Designing a module system around HTTP imports was ambitious. Here are some issues we encountered and how we solved for them.
Benchmarking AWS Lambda Cold Starts Across JavaScript Runtimes
When running production JavaScript in the cloud, performance is a critical consideration. Here’s how Deno’s cold start times compare against other JavaScript runtimes on AWS Lambda...
Announcing Supabase on JSR
Supabase's isomorphic JavaScript client library is now available on JSR.
Deno 1.45: Workspace and Monorepo Support
Deno 1.45 introduces workspaces and monorepo support, improved Node.js compatibility, updates to `deno install`, the new `deno init --lib` command, deprecation of `deno vendor`, St...
Introducing KV Backup for Deno Subhosting
This new feature allows Subhosting users to configure their KV databases to back up data to their own S3-compatible object storage via APIs.
A Gentle Intro to TypeScript
Quick, digestible bites of TypeScript goodness for Deno developers. In this first bite, we introduce TypeScript, how to add type annotations to your code and why you should.
Announcing Hono on JSR
Hono, a lightweight, fast, cross-platform web framework, is now on JSR.
How We Made the Deno Language Server Ten Times Faster
When a customer reported performance issues with the Deno language server, we began a performance investigation that resulted in reducing auto-completion times from 6-8 seconds to ...
How the Guardian uses Deno to audit accessibility and performance across their 2.7 million articles
The Guardian receives over 350 million unique page views. Learn how Deno helps the Guardian maximize web performance and adhere to accessibility standards to retain and grow their ...
Introducing More Flexible Domain Association for Deno Subhosting
This new update simplifies programmatically managing custom domains, wildcard domains, subdomains for different deployments, and more.
The stabilization process of the Standard Library has begun
The Deno Standard Library is going to reach 1.0.0 shortly. We hope you try RC versions of the packages and give us feedback!
Deno 1.44: Private npm registries, improved Node.js compat, and performance boosts
Deno 1.44 adds support for private npm registries, gRPC connections, improved Node.js compat with initial Next.js support, and significant performance improvements.
How we built a secure, performant, multi-tenant cloud platform to run untrusted code
When building a modern cloud platform to securely run untrusted code, it can be difficult to balance cost and performance. Here’s how we built Deno Deploy and Deno Subhosting.
The Deno Standard Library is now available on JSR
The Deno Standard Library has moved to JSR, supporting SemVer ranges in imports and compatibility with Node.js, Cloudflare Workers, and more.
How to document your JavaScript package
Writing good JSDocs for your JavaScript package is critical to its success. Here are some best practices for creating docs that helps your users be successful.
Your Low Code Solution Needs an Escape Hatch
A low-code solution is a simple way to offer some flexibility for your users. However, to accommodate further customization (especially for enterprise users), you should have an “e...
Deno 1.43: Improved Language Server performance
Deno 1.43 enhances productivity with a faster language server, improved npm compatibility, a new `deno serve` subcommand, URL.parse() API, and announcements regarding Deno 2.
How Slack used Deno to save months of engineering effort in launching their new platform
Learn how building with Deno helped Slack launch their new development platform in weeks and not months.
JSR Is Not Another Package Manager
JSR introduces a new way to share JavaScript and TypeScript code across platforms, focusing on simplifying distribution without replacing existing package managers.
Announcing the Hookdeck SDK on JSR
Hookdeck, an event gateway for distributed and async architecture, now has an SDK on JSR.
Announcing the Neon Serverless Driver on JSR
Neon, a performant, edge-compatible, serverless Postgres driver, arrives on JSR.
An intro to TSConfig for JavaScript Developers
TypeScript, one of the fastest growing languages, helps JavaScript developers improve code quality and productivity. But getting started can be challenging. Here's an introduction ...
How we built JSR
A modern JavaScript registry needs to be fast, reliable, and be as simple as possible for end users. Here's how we built JSR.
How Netlify used Deno Subhosting to build a successful edge functions product
Learn why Netlify chose Deno Subhosting over building their own solution with AWS Lambda to offer a successful edge functions product within weeks.
Introducing Simpler Project Creation in Deno Deploy
Introducing a more simplified project creation flow in Deno Deploy, including seamless CI/CD setup, a more transparent build and deployment step, and more.
Deno 1.42: Better dependency management with JSR
Deno 1.42 revolutionizes dependency management with the seamless integration of JSR, enhancing Node/npm compatibility and introducing significant performance improvements.
Introducing deployctl, the command line interface for Deno Deploy
Deno Deploy’s command line interface, deployctl, is the simplest way to deploy your projects to the cloud. Here’s how to do it.
Introducing JSR - the JavaScript Registry
The JavaScript Registry (JSR) is a TypeScript-first, ESM-only module registry designed for the entire JavaScript ecosystem. Use JSR modules from Deno and npm-based projects. JSR is...
How to add Monaco to a Next.js app and securely run untrusted user code
Enabling your users to deploy and run code can make your platform more useful. Here's a guide to building a platform that deploys and runs untrusted user code via a browser IDE wit...
Survey Results and Roadmap
You answered our survey and we listened. Here’s what we’re working on currently and what you can expect from Deno next.