Node.js vs Deno vs Bun: Runtime Comparison for 2026
JavaScript runtimes are no longer a monoculture. Node.js dominated for 15 years, but Deno and Bun have emerged as serious alternatives — each with different philosophies and trade-offs.
Here's how they compare in 2026.
The Contenders
Node.js (v22 LTS)
The original. Node.js has the largest ecosystem, widest compatibility, and most production deployments. It's not the fastest or most innovative, but it's the most reliable.
- Created by: Ryan Dahl (2009), now OpenJS Foundation
- Engine: V8 (Chrome's JavaScript engine)
- Language: C++
- Package manager: npm (bundled), supports Yarn and pnpm
Deno (v2)
Created by Ryan Dahl (the same person who created Node.js) as a "do-over" addressing Node's design mistakes. Deno 2 shipped full Node.js compatibility, making migration practical.
- Created by: Ryan Dahl (2018)
- Engine: V8
- Language: Rust
- Package manager: Built-in (also supports npm packages natively)
Bun (v1.2+)
The speed-focused runtime. Bun is a drop-in Node.js replacement that's 3-4x faster for many operations, with a built-in bundler, test runner, and package manager.
- Created by: Jarred Sumner / Oven (2022)
- Engine: JavaScriptCore (Safari's engine)
- Language: Zig + C++
- Package manager: Built-in (
bun install)
Performance Benchmarks
HTTP Server (Requests/Second)
Using a simple JSON response handler:
| Runtime | Requests/sec | Latency (p99) |
|---|---|---|
| Node.js 22 | 48,000 | 2.1ms |
| Deno 2 | 62,000 | 1.6ms |
| Bun 1.2 | 115,000 | 0.9ms |
Bun is 2.4x faster than Node.js for raw HTTP throughput. Deno is 30% faster than Node.
File I/O (Read 10,000 Files)
| Runtime | Time |
|---|---|
| Node.js 22 | 850ms |
| Deno 2 | 720ms |
| Bun 1.2 | 310ms |
Bun's I/O performance is consistently 2-3x faster than Node.js, thanks to aggressive kernel-level optimizations.
Package Install Speed
Installing a Next.js project (847 dependencies):
| Tool | Time |
|---|---|
| npm | 28s |
| pnpm | 16s |
| Yarn v4 | 14s |
| bun install | 4s |
bun install is dramatically faster than any other package manager — it's not even close.
Startup Time
| Runtime | Cold Start |
|---|---|
| Node.js 22 | 35ms |
| Deno 2 | 25ms |
| Bun 1.2 | 8ms |
Bun's startup time is 4x faster than Node.js, which matters for serverless and CLI tools.
Feature Comparison
| Feature | Node.js 22 | Deno 2 | Bun 1.2 |
|---|---|---|---|
| npm compatibility | ✅ Native | ✅ (v2) | ✅ |
| TypeScript | Via transpiler | ✅ Native | ✅ Native |
| JSX | Via transpiler | ✅ Native | ✅ Native |
| Built-in test runner | ✅ (node --test) | ✅ (deno test) | ✅ (bun test) |
| Built-in bundler | ❌ | ❌ | ✅ (bun build) |
| Built-in package manager | npm | ✅ | ✅ (bun install) |
| Web APIs (fetch, etc.) | ✅ | ✅ | ✅ |
| Permission system | ❌ | ✅ | ❌ |
| Single binary deploy | ❌ | ✅ (deno compile) | ✅ (bun build --compile) |
| Windows support | ✅ | ✅ | ✅ (improved) |
| Production maturity | ✅✅✅ | ✅✅ | ✅ |
npm Ecosystem Compatibility
This is the make-or-break factor for most teams.
Node.js
Full compatibility. It's the reference implementation — every npm package works.
Deno 2
Deno 2 brought near-complete Node.js compatibility. You can:
- Import npm packages directly:
import express from "npm:express" - Use
package.jsonandnode_modules(optional) - Run most Node.js applications without modification
Remaining gaps are edge cases: native addons (C++ bindings), some undocumented Node.js APIs, and packages that rely on Node-specific behaviors.
Bun
Bun aims for full Node.js API compatibility. In practice, the vast majority of npm packages work. Notable framework support:
- ✅ Next.js, Nuxt, SvelteKit, Astro
- ✅ Express, Fastify, Hono
- ✅ Prisma, Drizzle
- ⚠️ Some native addons (sharp, bcrypt) may need Bun-specific versions
Security
Deno's Permission System
Deno is the only runtime with a built-in permission system. By default, scripts can't access the file system, network, or environment variables:
# Explicitly grant permissions
deno run --allow-net --allow-read=./data server.ts
# Or allow everything (not recommended)
deno run --allow-all server.ts
This prevents supply chain attacks — even if a dependency contains malicious code, it can't access your file system or network without explicit permission.
Node.js and Bun have no equivalent. They trust all code implicitly.
Deployment Considerations
Serverless / Edge
| Platform | Node.js | Deno | Bun |
|---|---|---|---|
| AWS Lambda | ✅ | ✅ (custom runtime) | ✅ (custom runtime) |
| Vercel | ✅ | ❌ | ❌ |
| Cloudflare Workers | ❌ (workerd) | ✅ (Deno Deploy) | ❌ |
| Deno Deploy | ❌ | ✅ | ❌ |
| Fly.io | ✅ | ✅ | ✅ |
| Railway | ✅ | ✅ | ✅ |
Node.js has the widest serverless support. Deno has Deno Deploy (its own edge platform). Bun works best on traditional server/container deployments.
Docker Image Size
| Runtime | Base Image Size |
|---|---|
| Node.js 22 (Alpine) | 55MB |
| Deno | 40MB |
| Bun | 90MB |
Single Binary Compilation
Both Deno and Bun can compile your application into a standalone binary:
# Deno — single binary with all dependencies
deno compile --output myapp server.ts
# Bun — single binary
bun build --compile server.ts --outfile myapp
This simplifies deployment — no runtime installation needed on the target machine.
When to Use Each
Choose Node.js If:
- Production reliability is paramount — Most battle-tested option
- Maximum ecosystem compatibility — Every npm package works
- Team familiarity — Your team knows Node.js
- Serverless deployment — Widest platform support
- Enterprise requirements — Most corporate-approved option
Choose Deno If:
- Security matters — Permission system prevents supply chain attacks
- TypeScript-first — No build step needed
- Modern standards — Web APIs, ES modules by default
- Edge deployment — Deno Deploy is excellent
- Single binary — Deploy without a runtime
Choose Bun If:
- Speed is critical — 2-4x faster for most operations
- Developer experience — Fastest installs, native TS/JSX, built-in tools
- CLI tools — 4x faster startup makes Bun ideal for CLI apps
- You're starting fresh — No legacy Node.js code to worry about
Our Recommendation
For production web applications: Stick with Node.js. The ecosystem, compatibility, and deployment support are unmatched. The performance gap rarely matters when your bottleneck is database queries and network I/O.
For new projects where you control deployment: Try Bun. The DX improvements (fast installs, native TypeScript, built-in tools) are addictive. Fall back to Node.js if you hit compatibility issues.
For security-sensitive applications: Evaluate Deno. The permission system is a genuine security advantage that neither Node.js nor Bun offers.
Compare runtime-related packages on PkgPulse to see how the ecosystem is adapting to these new runtimes.