Cloudflare acquires Deno and plans to integrate celld into the open-source workerd

Author: Janakiram MSV

Compiled by Deep潮 TechFlow

DeepOcean Summary: Forbes reports that Cloudflare’s acquisition of Deno, founded by Ryan Dahl, the creator of Node.js, centers on the open-source project celld—which enables running Cloudflare’s serverless programming model on private infrastructure. The article states that Deno has raised approximately $26 million in funding (including a Series A led by Sequoia), that Deno Deploy will shut down in six months, and that the runtime will receive only one additional year of security updates. Cloudflare plans to integrate celld into the open-source workerd, turning the “hard-to-migrate” objection into a portability selling point—while leaving teams already running production workloads on Deno with an unplanned migration window.

Cloudflare has acquired Deno—the company behind the JavaScript and TypeScript runtime created by Node.js inventor Ryan Dahl. The most important asset in this acquisition is a small open-source project called celld, which enables enterprises to run Cloudflare’s serverless programming model on their own infrastructure.

This acquisition turned a long-standing external criticism of Cloudflare Workers—“applications built on it are hard to migrate away from”—into a selling point. For CIOs evaluating serverless and edge platforms, portability now has a concrete answer. However, teams already running on Deno now face an unplanned migration.

Cloudflare did not disclose the transaction amount. According to TechCrunch, Deno has raised a total of $26 million in funding, including an A-round led by Sequoia. The entire Deno team—led by Dahl and co-founder Bert Belder—will join Cloudflare.

To understand the location of Durable Objects, start with Workers. Cloudflare Workers run small JavaScript programs across the company’s global network, and Durable Objects add persistent state to this model. Each Durable Object acts like a separately addressable mini-server with its own SQLite database. For example, a chat application can assign one object per channel, distributing users and data across multiple machines.

In 2022, Cloudflare open-sourced the Workers runtime, workerd. The engineer who built the runtime, Kenton Varda, acknowledged in the joint announcement that workerd supports only a single instance of Durable Objects. This is sufficient for local testing but cannot scale in production environments.

Deno’s celld project fills this gap. Released in August, it is a single Rust binary that runs Workers and Durable Objects across multiple machines, with only object storage as an external dependency. Operators run multiple celld instances against the same bucket, and the software automatically handles placement, routing, and persistence. Dahl and Belder are now leading efforts to integrate celld into workerd, making self-hosting a supported way to run Workers applications.

This allows customers to build applications on the Cloudflare network and then migrate them to private data centers without rewriting. Varda wrote that Shopify required an open-source runtime even before developing on Workers for Platforms in 2022. He also disclosed that some former customers have already left Cloudflare using workerd.

Deno is Cloudflare’s second JavaScript tools company acquired this year. In June, it acquired VoidZero, the team behind the Vite build tool. Cloudflare stated that Vite is downloaded over 130 million times per week and pledged to keep the toolchain under the MIT license while establishing an independent fund for its maintainers.

These two transactions have positioned Cloudflare across the development, runtime, and self-hosted deployment aspects of modern web applications. The integration extends beyond Cloudflare: In December 2025, Anthropic acquired another JavaScript runtime, Bun, to power Claude Code.

AWS Lambda, Vercel, and Netlify all operate mature serverless platforms with large developer ecosystems. Dahl himself has previously listed Vercel, Netlify, and Workers as competitors to Deno Deploy. However, according to Varda, the defining difference of Cloudflare’s approach is that workerd is the exact same code Cloudflare runs in production. The addition of celld fills the distributed state layer that self-hosters have always lacked.

Dahl's own post labeled AI agents as the target workload. Durable Objects combine low-cost serverless execution, persistent state, and WebSocket support—the very capabilities needed to chain together long-running tasks in agent frameworks. Enterprises building agents on their own infrastructure are the primary customers Dahl aims to attract.

Developers and companies currently using Deno are immediately footing the bill for this transaction. Cloudflare will release monthly bug fixes and security updates for the Deno runtime over the next year, after which development will cease [verified prior to publication; end date approximately October 2027]. Deno Deploy will shut down six months later, with paid customers receiving migration support to Workers. The runtime will remain open source under the MIT license, but no organization has committed to continuing its maintenance.

Dahl explained this decision in a comment on Hacker News. He felt that Deno had been pulled into the trajectory of replicating Node.js behavior, leaving little room to build the new abstractions he wanted to create. This is a candid admission from a founder. It also signals to companies relying on venture-backed open-source tools how quickly roadmaps can change after an acquisition.

Portability remains more of a promise than a product. The Celld project is only two months old. Beyond stating that “more announcements will follow in the coming months,” Cloudflare has not disclosed a timeline for self-hosted work after the merger. Self-hosting would return responsibility for patching, scaling, and storage reliability to customers’ platform teams. Cloudflare has also not specified which of its surrounding services—such as KV, R2, and Queues—will have self-hosted equivalents.

Teams running production workloads on Deno Deploy should begin migration planning now—a six-month window is short for regulated applications. Teams using the Deno runtime should take inventory of where it’s being used, including internal CLI tools and build scripts. They must choose between Node.js, Bun, and Workers before security updates cease.

For organizations evaluating Workers, the first question is the exit cost: which parts of the application depend on Durable Objects and Cloudflare’s proprietary services, and can these currently run on workerd? The second question is: who will support self-hosted deployments in production—will Cloudflare offer paid support for self-hosted workerd, or will the platform team bear the operational risk alone?

This transaction also raises the bar for competitors. Vercel, Netlify, and hyperscale cloud providers now face buyers who can point to a self-hosted, open-source version of a serverless runtime. These buyers will demand equivalent assurances in their own contract negotiations.

If Cloudflare can integrate celld's capabilities into workerd within the next year, its argument that open source reduces lock-in will become compelling. Enterprises seeking the Workers programming model but unwilling to tie every workload to a single network will benefit, as will the broader JavaScript community, twice shaped by Dahl.