Dev Tools
Deno vs Bun: Which Modern JS Runtime Wins in 2026?
Deno vs Bun compared โ performance, compatibility, tooling, and ecosystem. We benchmark both runtimes in real-world scenarios.
Last updated: 2026-08-10
Bun is better for most developers
The security-focused runtime with excellent TypeScript support and a mature edge deployment story via Deno Deploy. The fastest JavaScript runtime available. Node.js compatibility is near-perfect, and the built-in bundler/test runner are incredibly fast.
Deno
The security-focused runtime with excellent TypeScript support and a mature edge deployment story via Deno Deploy.
Bun
The fastest JavaScript runtime available. Node.js compatibility is near-perfect, and the built-in bundler/test runner are incredibly fast.
Feature Comparison
| Feature | Deno | Bun |
|---|---|---|
| Performance | ||
| Startup Time | Fast | Extremely fast Winner |
| HTTP Server Throughput | Good | Best in class Winner |
| SQLite Operations | Good (Deno KV) | Native Bun:sqlite Winner |
| Compatibility | ||
| npm Package Support | Good (Deno 2) | Excellent Winner |
| Node.js API Compatibility | Good | Near-complete Winner |
| TypeScript Support | Native, zero-config | Native, zero-config |
| Tooling | ||
| Built-in Test Runner | | |
| Built-in Bundler | | Winner |
| Built-in Package Manager | | Winner |
| Edge Deployment Platform | Deno Deploy Winner | |
| Security | ||
| Permission-based Sandbox | Winner | |
| File System Permissions | Winner | |
| Score | 3 / 12 | 7 / 12 |
The Quick Takeaway
Bun is faster and more compatible with the Node.js ecosystem. Deno has better security and a unique edge deployment story. If performance and compatibility are your priorities, Bun wins. If security and edge computing matter more, Deno is the better choice.
Performance
Bun is the fastest JavaScript runtime available. Built on JavaScriptCore (Safariโs engine), it consistently outperforms both Deno and Node.js in benchmarks. Startup time, HTTP throughput, and file operations are all faster.
Compatibility
Bunโs Node.js compatibility is near-complete. Most npm packages work without modification. Deno 2 improved npm support significantly, but Bunโs compatibility layer is more thorough โ especially for packages that use Node.js internals.
Security
Denoโs permission-based security model is unique. Scripts run in a sandbox by default, requiring explicit permission for file system, network, and environment access. Bun has no equivalent sandbox โ it runs with full system access like Node.js.
Ecosystem
Deno Deploy provides a unique edge deployment platform โ deploy globally in seconds with built-in KV storage and cron jobs. Bun doesnโt have an equivalent hosted platform, though it works with any Node.js hosting.
The Verdict
Choose Bun if you want maximum performance, Node.js compatibility, or built-in bundling/testing. Choose Deno if you need sandboxed execution, edge deployment, or TypeScript-first development.