bun-runtime

Implement Bun server-side applications using Bun.serve, Bun.file, and FFI.

Updated Aug 23, 2026
One-click install
npx skills add https://github.com/zacharyr0th/next-starter --skill bun-runtime
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: bun-runtime
Source: https://github.com/zacharyr0th/next-starter/tree/main/.claude/skills/bun/bun-runtime
Command: npx skills add https://github.com/zacharyr0th/next-starter --skill bun-runtime

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides expert knowledge of Bun's native runtime APIs, enabling developers to build high-performance server-side applications, HTTP APIs, and handle file operations with unparalleled speed. It addresses the need for faster execution and simpler native integrations compared to Node.js.

Core Features & Use Cases

  • High-Performance Servers: Build HTTP and WebSocket servers using Bun.serve, capable of handling millions of requests per second, significantly faster than Node.js alternatives.
  • Efficient File I/O: Perform optimized file operations with Bun.file and Bun.write, leveraging system-level optimizations for faster read/write speeds.
  • Native Integration: Utilize the Foreign Function Interface (FFI) to call native C libraries directly, manage child processes, and integrate with Bun-specific utilities like Bun.password for hashing.
  • Use Case: "I want to build a REST API with Bun. Show me how to set up a Bun.serve HTTP server with basic routing for /users and /products endpoints."

Quick Start

Create a simple HTTP server using Bun.serve that listens on port 3000 and responds with "Hello from Bun!" to all requests.

Frequently Asked Questions about bun-runtime

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build a high-performance HTTP server with Bun?

Build HTTP servers using `Bun.serve`, which handles millions of requests per second. Define a fetch handler that routes requests to endpoints like `/users` and `/products`, then start the server on your chosen port for blazing-fast request processing.

Can I use Bun for WebSocket servers and real-time APIs?

Yes, `Bun.serve` supports WebSocket connections natively. Configure the fetch handler to upgrade HTTP connections to WebSocket and manage bidirectional messaging for real-time applications without additional libraries.

What's the fastest way to handle file I/O in Bun?

Use `Bun.file` for optimized reads and `Bun.write` for writes, leveraging system-level optimizations. These APIs deliver significantly faster file operations than Node.js alternatives for loading, streaming, and persisting data.

How do I call native C libraries from Bun?

Bun's Foreign Function Interface (FFI) lets you call native C libraries directly without wrapping. Load compiled binaries, define function signatures, and invoke them from JavaScript for native-level performance and integration.

Can I spawn child processes and manage workers in Bun?

Yes, Bun supports spawning child processes and workers for concurrent task handling. Use process management APIs to execute external commands, parallelize workloads, and integrate with system utilities.

Why choose Bun's runtime over Node.js for API development?

Bun delivers significantly faster HTTP server performance, simpler native integration via FFI, optimized file I/O, and built-in utilities like `Bun.password` for hashing, reducing dependencies and runtime overhead compared to Node.js.