Bun vs Deno (2026): Which JavaScript Runtime Wins?
By ToolVS Research Team · Updated April 9, 2026 · Based on real-world testing
Quick verdict: Bun wins 6-4 for speed. Bun is blazing fast -- installs packages in seconds, runs scripts faster than Node, and includes a bundler and test runner built-in. Deno is more secure by default and has better TypeScript support. For raw speed and Node.js compatibility, Bun. For security-first and clean standards, Deno.
Our Verdict
Bun
- Fastest JS runtime — benchmarks dominate
- Near-perfect Node.js compatibility
- Built-in bundler, test runner, package manager
- Younger — some edge cases
- macOS/Linux focus (Windows improving)
- Less mature ecosystem tooling
Deno
- Secure by default — permission system
- Native TypeScript — no config needed
- Web standard APIs throughout
- Slower than Bun in benchmarks
- npm compatibility still catching up
- Smaller package ecosystem
Side-by-Side Comparison
| Category | Bun | Deno | Winner |
|---|---|---|---|
| Raw Speed | Fastest JS runtime available | Fast but behind Bun | ✔ Bun |
| Node.js Compatibility | Near-perfect npm/node compat | Improving but gaps remain | ✔ Bun |
| Security | Standard permissions | Secure by default — explicit permissions | ✔ Deno |
| TypeScript | Native but needs tsconfig | Native — zero config | ✔ Deno |
| Package Management | bun install — fastest ever | npm: specifier system | ✔ Bun |
| Built-in Tools | Bundler + test runner + PM | Test runner + formatter + linter | ✔ Bun |
| Web Standards | Some support | Fully web-standard APIs | ✔ Deno |
| Windows Support | Improving | Full Windows support | ✔ Deno |
| Deploy (Cloud) | Growing support | Deno Deploy — excellent | ✔ Deno |
| Maturity | Younger, some rough edges | More mature, stable | ✔ Deno |
Which do you use?
Who Should Choose What?
Choose Bun if:
Speed is your priority. Bun makes everything faster -- installs, scripts, tests, bundling. If you have an existing Node.js project and want an instant speed boost, bun is often a drop-in replacement. The all-in-one toolkit (bundler + test runner + PM) also reduces dependency count.
Choose Deno if:
Security and web standards matter most. Deno permission system prevents supply chain attacks by default. Native TypeScript with zero config is delightful. Deno Deploy is also an excellent serverless platform. Best for security-conscious teams and new TypeScript projects.
FAQ
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Our Methodology
We benchmarked both runtimes on HTTP throughput, file I/O, startup time, and package installation speed. Also evaluated real-world development experience building identical applications over 30 days.
Ready to choose?
Last updated: . Pricing and features verified weekly.