Your JavaScript is running – but is your runtime doing you any favours on speed, security and cost? In this episode of SEEK Bytes, Seamus, Will and Rahul unpack the fast-moving world of JavaScript runtimes and engines – from Node.js and V8 to up-and-comers like Deno and Bun – and what they mean for teams running real systems in production.

In this episode, we explore:

• What a JavaScript runtime actually is (vs an engine) – a sandboxed environment that provides I/O, env vars and APIs, on top of engines like V8 or JavaScriptCore that parse and execute your code, plus why Node, browsers and tools like ts-node all sit on this stack differently.

• How modern runtimes reshape DX, security and performance – from Deno’s --allow-net / --allow-read-style permissions and URL-based imports, to Node 18’s built-in test runner, to Bun bundling JSX, TypeScript, formatting and tooling so you’re not hand-wiring ESLint, Prettier and watch modes every time.

• Why competition (Node vs Deno vs Bun) is good for everyone – how claims like “performance-focused” and “drop-in Node replacement” sparked spicy benchmark debates, pushed Node to mature, and give engineers real choices for hackathons vs production systems in a TypeScript-everywhere world.

Whether you’re a software engineer, SRE, architect, DevOps, platform or IT manager, this episode will help you make smarter choices about the JavaScript under your products, dashboards and devices – and understand where the ecosystem is heading next.

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