Deno vs Bun Comparison

Overview

Deno is a secure runtime for JavaScript and TypeScript built on V8, the same engine used by Chrome. It emphasizes security and modern features.

Key Features

• Secure by default, requiring explicit permissions
• Supports TypeScript out of the box
• Single executable (no package manager needed)

Code Example

import { serve } from "https://deno.land/std/http/server.ts";

const server = serve({ port: 8000 });
console.log("HTTP server is running.");

for await (const req of server) {
  req.respond({ body: "Hello Deno!\n" });
}

Overview

Bun is a fast JavaScript runtime that focuses on speed and developer experience. It includes a bundler, transpiler, and package manager in one tool.

Key Features

• Extremely fast performance
• Built-in bundler and package manager
• Support for native modules

Code Example

import { serve } from "bun";

serve((req) => {
  return new Response("Hello Bun!");
}, { port: 3000 });

console.log("Bun server running on port 3000");

Performance

Bun outperforms Deno in most benchmarks due to its native architecture and optimizations.

Feature Set

• Deno: Secure by default, TypeScript support.
• Bun: Fast execution, built-in bundling.

Use Cases

Choose Deno for secure applications needing TypeScript. Use Bun for performance-critical applications or projects requiring fast prototyping.