What Can You Build with Bun?
Everything you build with Node.js - websites, APIs, bots, scripts, tools. It’s just a different runtime for JavaScript/TypeScript. Same code, runs faster, less config.
That said - it’s relatively new and there are edge cases so worth checking before starting.
Advantages
Fewer dependencies = less code = less potential for bugs
Lots built-in: password hashing, bundler, SQLite, much fewer installations.
Faster:
- Install 10-20x faster
- Code execution 2-4x faster
- Startup almost instant
More advantages:
- Quick executable building for distribution
- Compatible with almost all npm packages
- Clean native TypeScript code (no build step)
You can use it today.
Migration in Practice
Yesterday in ten minutes I migrated a Next.js project to Bun with Claude.
Before (npm/Node):
- Code: package-lock.json - 9,730 lines
- Install: npm install - ~60 seconds
After (Bun):
- Code: bun.lock - 1,349 lines (86% less)
- Install: about 6 seconds (10x faster)
No code changes - just the commands.
Summary
Bun is like Node.js but faster and simpler. Worth trying on new projects.
Also has built-in SQLite for memory, perfect for the local agent I’m building.