Deno 2 vs Bun: Modern Runtimes for AI Backends
Compare Deno 2 and Bun as JavaScript/TypeScript runtimes for AI backends. npm compatibility, security, performance, and developer experience.
Deno 2
Secure-by-default runtime by Ryan Dahl. Full npm compatibility, native TypeScript, built-in formatter/linter. Deno Deploy for edge.
Bun
Fastest all-in-one runtime: JS/TS, bundler, package manager, test runner. Native TypeScript. Built for speed.
Comparison table
| Feature | Deno 2 | Bun |
|---|---|---|
| npm compatibility | Deno 2: full npm support | Nearly full, some native module issues |
| Security | Permissions system, secure by default | No permission model |
| Speed | Fast, V8-based | Fastest — JavaScriptCore, faster cold start |
| Built-in tools | Formatter, linter, test runner, bundler | Bundler, package manager, test runner |
| Edge/Deploy | Deno Deploy — global edge | No own deploy platform |
Verdict
Deno 2 for security-first and edge deployment. Bun for maximum speed and all-in-one tooling. Both native TypeScript, both npm-compatible.
Our recommendation
AVARC Solutions tests both for AI projects. Deno 2 for edge AI (Deno Deploy) and security-sensitive backends. Bun for local development and speed-critical scripts.
Frequently asked questions
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