shouldiuse.io

Comparison

Bun vs Deno

Bun and Deno 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

Bun versus Deno
CompareBunDeno
VerdictDependsDepends
Best forNew JS/TS projects wanting one fast toolchainNew TypeScript-first projects
Who it's not forProduction-critical apps that cannot absorb runtime churnTeams migrating large Node codebases expecting zero friction
PrivacyTwo recent CVEs (command injection, trusted-dependencies spoofing) plus active malware campaigns abusing the runtime.Permission-model runtime with real 2026 CVEs (auth bypass, info disclosure); secure-by-default claims questioned by academic studies.
Support qualityPost-acquisition support called limited and deprecatedNo support evidence in sources
Public sentimentUsers praise Bun's speed and resource efficiency, but the 1.4 Rust rewrite and post-acquisition support draw criticism.¹Users like Deno's built-in TypeScript and developer experience but report migration friction, npm incompatibilities, and a smaller ecosystem than Node.
Biggest gotchaAcquired December 2025 with zero revenue; priorities may shift toward Anthropic's goals.⁶Permission sandbox has real bypass CVEs; not a hard security boundary

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

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

Sources

  1. Reddit r/bun . real-world Bun.js experiencesreddit.com
    review
  2. Hacker News . Bun team AMAnews.ycombinator.com
    review
  3. Hacker News . Bun 1.4 Rust rewrite is not looking good?news.ycombinator.com
    review
  4. Hacker News . Bun support is now limited and deprecatednews.ycombinator.com
    news
  5. The Pragmatic Engineer . Bun's Rust rewriteblog.pragmaticengineer.com
    news
  6. Bun Blog . Bun is joining Anthropicbun.com
    official
  7. dev.to . Anthropic just acquired Bun.jsdev.to
    news
  8. Wikipedia . Bun (software)en.wikipedia.org
    news
  9. GitHub . oven-sh/bungithub.com
    official
  10. SentinelOne . CVE-2026-24910sentinelone.com
    security
  11. GitHub Advisory . CVE-2025-8022github.com
    security
  12. charpeni . The Bun CVE Gapcharpeni.com
    security
  13. Endor Labs . Why npm malware keeps reaching for Bunendorlabs.com
    security
  14. Snyk . Bun-based stealer hits SAP packagessnyk.io
    security
  15. bun.sh/securitybun.sh
    official
  16. Toolradar . Bun pricingtoolradar.com
    review