shouldiuse.io

Comparison

Deno vs Bun

Deno and Bun both land on Depends.

Bun

bun.sh

Depends
Confidence: Medium

Try Bun for new JS/TS projects, scripts, and tooling . it is free, fast, and npm-compatible.

Read the full report

Deno versus Bun
CompareDenoBun
VerdictDependsDepends
Best forNew TypeScript-first projectsNew JS/TS projects wanting one fast toolchain
Who it's not forTeams migrating large Node codebases expecting zero frictionProduction-critical apps that cannot absorb runtime churn
PrivacyPermission-model runtime with real 2026 CVEs (auth bypass, info disclosure); secure-by-default claims questioned by academic studies.Two recent CVEs (command injection, trusted-dependencies spoofing) plus active malware campaigns abusing the runtime.
Support qualityNo support evidence in sourcesPost-acquisition support called limited and deprecated
Public sentimentUsers like Deno's built-in TypeScript and developer experience but report migration friction, npm incompatibilities, and a smaller ecosystem than Node.⁵Users praise Bun's speed and resource efficiency, but the 1.4 Rust rewrite and post-acquisition support draw criticism.13
Biggest gotchaPermission sandbox has real bypass CVEs; not a hard security boundary⁹Acquired December 2025 with zero revenue; priorities may shift toward Anthropic's goals.

Pick Deno when

  • New TypeScript-first projects
  • Edge-deployed APIs via Deno Deploy
  • Solo devs wanting built-in tooling
  • npm-compatible scripts and tooling

When Deno is not a fit

  • Teams migrating large Node codebases expecting zero friction
  • Apps treating the permission sandbox as the only security control
  • Enterprises needing Node-scale ecosystem maturity and support
  • Projects dependent on native-binding npm packages that may break

Pick Bun when

  • New JS/TS projects wanting one fast toolchain
  • Solo devs replacing multi-tool setups
  • Scripts and data-processing workloads
  • npm users seeking faster installs

When Bun is not a fit

  • Production-critical apps that cannot absorb runtime churn
  • Teams needing committed long-term vendor support
  • Regulated shops wary of fresh toolchain CVEs
  • Guess: heavy users of Node-native addons and edge cases

Sources

  1. Deno homepagedeno.com
    official
  2. Announcing Deno 2deno.com
    official
  3. Deno Deploy Pricingdeno.com
    official
  4. deno audit docsdocs.deno.com
    official
  5. Deno Is Not the Drop-In Replacement I Hoped Forreddit.com
    review
  6. Bun vs Deno vs Node migration datamedium.com
    review
  7. Why didn't Deno take off?spencerpauly.com
    review
  8. Deno Deploy bandwidth cost complaintsreddit.com
    review
  9. CVE-2026-22864: Deno Auth Bypasssentinelone.com
    security
  10. CVE-2026-27190 Detail - NVDnvd.nist.gov
    security
  11. Deno raises $21Mtechcrunch.com
    news
  12. Companies that use Deno (828)theirstack.com
    news
  13. Reddit r/bun . real-world Bun.js experiencesreddit.com
    review
  14. Hacker News . Bun team AMAnews.ycombinator.com
    review
  15. Hacker News . Bun 1.4 Rust rewrite is not looking good?news.ycombinator.com
    review
  16. Hacker News . Bun support is now limited and deprecatednews.ycombinator.com
    news