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Building APIs with Bun: Fast JavaScript Runtime

Administrator admin API JavaScript Intermediate Jan 09, 2026 12:41 AM 3 views

Bun Overview

Bun is an incredibly fast JavaScript runtime, bundler, and package manager built with Zig.

Basic Bun Server

// server.ts
export default {
    port: 3000,
    fetch(request: Request) {
        const url = new URL(request.url);
        
        if (url.pathname === "/api/users") {
            return new Response(JSON.stringify([
                { id: 1, name: "John", email: "john@example.com" }
            ]), {
                headers: { "Content-Type": "application/json" }
            });
        }
        
        return new Response("Not Found", { status: 404 });
    }
};

Running Bun

# Run server
bun run server.ts

# Install dependencies
bun install

Best Practices

  • Leverage Bun's speed
  • Use native TypeScript support
  • Take advantage of built-in tools
  • Use Bun's package manager
  • Optimize for performance

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