Cloudflare is acquiring Deno, the startup behind the JavaScript and TypeScript runtime of the same name, and folding its engineers into the team that builds Cloudflare Workers. Financial terms weren’t disclosed. Deno raised $26 million in total, including a Series A led by Sequoia, TechCrunch reports.
The deal arrived with an unusual backstory. In August, Deno released celld, an open-source implementation of the Workers programming model, aimed at developers who want to run distributed apps on their own infrastructure. Cloudflare says it was “delighted” by the project, and it’s now merging celld with workerd, its open-source Workers runtime.
What changes for Deno and Workers
In a post on the Cloudflare blog, Kenton Varda, principal engineer for Workers, said the aim is to make it far easier to self-host Workers and Durable Objects, so developers can use the same primitives outside Cloudflare’s network. Durable Objects are small, individually addressable servers, each with its own SQLite database. Varda admitted that workerd’s Durable Objects support has been its biggest production gap, because it’s limited to a single instance.
Ryan Dahl, who created Node.js and co-founded Deno with Bert Belder, wrote that the team is “joining Cloudflare to make the Workers programming model a mainstream way to build servers.” According to The New Stack, Dahl and Belder will lead the merger of celld and workerd, and Deno’s standalone runtime and its Deno Deploy hosting service will be wound down. Developers who rely on either should watch for migration guidance, which the sources reviewed here don’t detail.
Varda also addressed the theory that Cloudflare built Workers differently from other platforms to create lock-in. He argued that being open source and offering an escape hatch is “good business.”
Why it matters
Deno Deploy competed directly with Workers, so the acquisition removes a rival and adds a team with experience in self-hosted runtimes, something Varda said Cloudflare never quite cracked with workerd. For teams already building on Workers, the practical result should be a smoother route to running the same code on their own servers or in other clouds. Cloudflare hasn’t given a timeline.
Cloudflare has been pushing further into developer tooling. It recently unveiled an AI browser aimed at agents rather than people, and it’s one of the sandbox partners in OpenAI’s Agents API. Neither the announcement nor the coverage addresses regional availability or plans for the GCC.
What happens to the Deno runtime?
Cloudflare says the standalone runtime and Deno’s cloud hosting service will be wound down, with the team moving to Workers, according to The New Stack.
How much did Cloudflare pay for Deno?
Neither company has disclosed the price. Deno had raised $26 million in funding before the deal.
What is celld?
It’s Deno’s open-source take on the Workers and Durable Objects model for self-hosted, distributed apps. Cloudflare plans to merge it with workerd.
