Deno is a hot new runtime that may replace Node.js. Everyone’s talking about it like it’s the next big thing. It likely is. Here’s why. What Is Deno? From the manual: Deno is a JavaScript/TypeScript runtime with secure defaults and a great developer experience. It’s built on V8, Rust, and Tokio. Deno is designed to be a replacement for our beloved Node.js, and it’s led by Ryan Dahl, who started the Node.