Cloudflare Dynamic Workers: Sandboxed Code Execution at the Edge

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I needed to run user-defined JavaScript templates from a database — code that formats RSS feed items into social media posts. The templates could be anything: hand-written, AI-generated, pasted from a blog. Running arbitrary code strings inside my production Worker, with access to D1 databases and R2 buckets, wasn't an option. Cloudflare's Dynamic Workers , released in March 2026, solved this.…

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