Deno vs Bun: Which is Better in 2026?
Bun and Deno are both modern alternatives to Node.js, but they make opposite bets on what matters most. Bun (now on v1.3.x) is an all-in-one runtime built on JavaScriptCore and obsessively optimized for raw speed and drop-in Node.js compatibility. Deno (now on v2.7.x) was rebuilt by Ryan Dahl, the original Node creator, as a corrected design: secure by default, web-standards first, and TypeScript-native from day one. The core tension is this: Bun asks you to trust its speed and Node drop-in promise, while Deno asks you to trust its security model and standards alignment. Teams migrating from Node with minimal friction lean toward Bun; teams building new services where security, edge deployment, or web-standards purity matters lean toward Deno.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Deno
The next-generation open-source JavaScript runtime for the modern web, built on web standards.
Best for you if:
- • A secure and modern JavaScript/TypeScript runtime with built-in tooling.
- • Supports web standards, TypeScript, JSX, and integrates with npm/Node.js.
Bun
Fast JavaScript runtime and package manager
Best for you if:
- • You need something completely free
- • Bun is an all-in-one JavaScript runtime and toolkit designed for speed
- • It provides a bundler, test runner, and package manager that's dramatically faster than Node
| At a Glance |  Deno |  Bun |
|---|---|---|
Starts at | FreeFree tier available | FreeFree tier available |
Best For | Developer Tools | Developer Tools |
Rating | - | - |
Free plan | Yes | Yes |
Choose Deno or Bun?
Choose Deno if
The next-generation open-source JavaScript runtime for the modern web, built on web standards.
- TypeScript native
- Secure by default
- Built-in tooling (fmt, lint, test)
Choose Bun if
Fast JavaScript runtime and package manager
- Extremely fast runtime
- Drop-in Node replacement
- Built-in bundler and test runner
- You want a fully free tool (Deno requires payment)
| Feature | Deno | Bun |
|---|---|---|
| Pricing Model | Freemium | Free |
| User Rating | No ratings yet | No ratings yet |
| Categories | Developer ToolsHosting & Deployment | Developer ToolsTerminal Tools |
In-Depth Analysis
Deno
Strengths
- +Secure by default: scripts cannot access the filesystem, network, or environment variables unless explicitly granted via flags, reducing supply-chain attack surface
- +Full Node.js and npm compatibility as of Deno 2.0 (released October 2024), including package.json, node_modules, and npm workspaces support
- +First-class TypeScript support with no separate compilation step, and native alignment with web-standard APIs (fetch, Request, Response, Temporal) matching browser behavior
- +Built-in all-in-one toolchain: deno fmt, deno lint, deno test, deno doc, and the dx tool (equivalent of npx) for running npm/JSR binaries
- +Deno Deploy (free tier: 100k req/day, 1 GB KV storage; Pro: $20/month) provides a managed edge deployment platform co-designed with the runtime
Weaknesses
- -Historically slower than Bun on raw throughput benchmarks; Deno is competitive on serverless and edge workloads but does not match Bun's peak HTTP numbers
- -npm compatibility reached ~95%, meaning a small but real fraction of packages with native Node-API addons may require the presence of a local node_modules/ directory
- -Smaller npm-registry mindshare than Node or Bun; JSR (Deno's own registry) adds a parallel dependency surface developers must manage
- -Permission flags add operational overhead: --allow-net, --allow-read, etc. must be specified explicitly, which slows initial prototyping and can frustrate teams used to permissive Node defaults
Best For
Deno is the right pick for teams building new services where security hygiene, web-standard API fidelity, or edge deployment via Deno Deploy are first-class requirements, particularly in regulated industries or multi-contributor open-source projects.
Deno 2.x resolved the biggest historical objection (npm incompatibility) while keeping its security model intact. The result is a runtime that is now genuinely usable for Node-origin codebases without sacrificing the permission sandbox or web-standards alignment that made Deno distinctive. The integrated Deno Deploy platform adds a deployment story Bun currently lacks as a first-party offering.
Bun
Strengths
- +Fastest JavaScript runtime in HTTP benchmarks: ~52,000 req/s versus Node's ~13,000 in throughput tests, with 8-15ms cold starts compared to Node's 40-120ms
- +Single binary with a runtime, package manager (bun install is 20-40x faster than npm), bundler, test runner, and built-in SQLite, PostgreSQL, MySQL, and Redis clients
- +Over 99% compatibility with Node.js APIs and npm packages, making migration from existing Node projects nearly frictionless
- +Built-in Bun.SQL unified database API and a Redis/Valkey client that benchmarks 7.9x faster than ioredis
- +Native HTTP/2 server support that is 2x faster than Node.js's implementation, plus cross-platform executable compilation
Weaknesses
- -No permission or sandbox model: Bun programs have full system access by default, which requires external controls (containers, OS) to compensate
- -Younger ecosystem and smaller community than Node or Deno; edge cases in Node compatibility surface in complex production setups
- -Windows support remains less mature than Linux and macOS, limiting adoption in enterprise environments tied to Windows servers
- -Less alignment with web-standard APIs compared to Deno, which can create subtle behavioral differences when targeting browser-compatible code
Best For
Bun is the right pick for teams migrating existing Node.js codebases who want immediate performance gains without rewriting code, or for backend services where raw throughput and fast install times are the primary optimization target.
Bun delivers on its speed promise in a way that is hard to ignore: 4x HTTP throughput improvements and 20x faster package installs are real, reproducible numbers. The all-in-one toolchain genuinely reduces dependency sprawl. The tradeoff is a trust bet on a younger runtime with no built-in security model, which is acceptable in containerized or serverless environments but less so for workloads requiring granular permission control.
Head-to-Head Comparison
Performance
Bun winsBun consistently leads in HTTP throughput benchmarks, hitting ~52,000 req/s versus Deno's competitive but lower numbers, with cold starts of 8-15ms. Deno is strong on serverless and edge workloads but does not match Bun's peak throughput on standard server benchmarks. For CPU-bound tasks, independent tests show Bun cutting compute time roughly in half compared to Node, and Deno lands somewhere between the two.
Security
Deno winsDeno's secure-by-default permission model is a genuine architectural advantage: no network, filesystem, or environment access without explicit flags, plus a built-in deno audit command that scans dependencies against the GitHub CVE database. Bun has no equivalent permission system, treating security as an OS or container concern. For regulated workloads or projects with many external contributors, Deno's model meaningfully reduces the attack surface.
Ecosystem and Compatibility
Bun winsBun claims over 99% compatibility with Node.js APIs and npm packages, and in practice Node-origin projects tend to run on Bun with fewer modifications. Deno 2.x closed most of the gap (approximately 95% npm compatibility, full package.json support) but a small fraction of packages with native Node-API addons still require extra configuration. Both now support npm, but Bun's higher compatibility ceiling makes it safer for complex existing codebases.
Developer Toolchain
TieBoth runtimes include an all-in-one toolchain that eliminates the need for separate Prettier, ESLint, and Jest installs. Bun bundles its runtime, package manager, bundler, and test runner (bun test runs up to 20x faster than Jest). Deno bundles deno fmt, deno lint, deno test, deno doc, and the new dx (npx equivalent). The feature sets are comparable; preference comes down to whether you value Bun's speed-focused design or Deno's web-standards alignment.
Edge and Serverless Deployment
Deno winsDeno Deploy is a first-party managed edge platform with a generous free tier (100k req/day, 1 GB KV) and a $20/month Pro plan, co-designed with the Deno runtime for minimal configuration. Bun is supported on Cloudflare Workers and Vercel Edge Functions via its fast cold starts, but there is no equivalent first-party Bun hosting product. For teams wanting an end-to-end runtime-to-deploy story, Deno has a clear advantage.
TypeScript Support
Deno winsDeno treats TypeScript as a first-class language: files run natively without a separate compilation step or tsconfig required. Bun also runs TypeScript natively, but Deno's deeper integration, stricter type-checking defaults, and alignment with evolving TC39 proposals (including the now-stable Temporal API in Deno 2.7) give it a slight edge for TypeScript-first teams.
Migration Considerations
Migrating from Node to Bun is lower-friction for existing codebases given its 99% Node API compatibility, but you will need to add container-level security controls to compensate for the missing permission model. Migrating to Deno requires adapting to the permission flag system and auditing any packages that rely on Node-API addons, but the two-way npm compatibility in Deno 2.x means you can adopt it incrementally rather than rewriting everything at once.
Pricing: Deno vs Bun
| Plan | Deno | Bun |
|---|---|---|
| Tier 1 | $0 Free | Free Free |
| Tier 2 | $20 Pro | N/A |
| Tier 3 | Custom Enterprise | N/A |
Pricing verified from each vendor's public pricing page. Compare in detail on Deno pricing and Bun pricing.
Who Should Use What?
On a budget?
Bun is free. Deno is freemium.
Go with: Bun
Want the highest-rated option?
Neither has ratings yet.
Too early to call on ratings — compare on features and pricing.
Value user reviews?
Neither has ratings yet.
Too early to call — neither has ratings yet.
3 Questions to Help You Decide
What's your budget?
Deno is freemium. Bun is free. Go with Bun if free matters most.
What's your use case?
Both are developer tools tools. Compare their specific features to decide.
How important are ratings?
Neither has ratings yet.
Key Takeaways
Bun
- Completely free
- Our pick for this comparison
Deno
- Choose if you want the next-generation open-source JavaScript runtime for the modern web, built on web standards
The Bottom Line
Choose Bun when you are optimizing an existing Node.js service for throughput and want the fastest possible HTTP performance with minimal migration effort: it is the pragmatic, speed-first choice for teams who treat security as an infrastructure concern. Choose Deno when you are starting a new service, operating in a regulated environment, or deploying to the edge via Deno Deploy: its secure-by-default model, native TypeScript, and web-standards alignment make it the architecturally sounder foundation for greenfield work. For most teams building new backend services in 2026, Deno 2.x is the more defensible long-term choice; for teams modernizing a large Node codebase with minimal rewrites, Bun wins on practical grounds.
Frequently Asked Questions
Is Bun faster than Deno in 2026?
Yes, in most benchmarks Bun is faster: it achieves approximately 52,000 req/s in HTTP throughput tests versus lower numbers for Deno, and cold starts of 8-15ms make it particularly competitive for serverless workloads. That said, independent real-world tests on production-grade applications with routing and database operations show the gap narrowing significantly, so the benchmark advantage is most pronounced in throughput-optimized scenarios.
Does Deno 2.x support npm packages?
Yes. Deno 2.0 (released October 2024) added full npm compatibility, including package.json, node_modules, npm workspaces, and Node-API addon support when a local node_modules directory is present. Compatibility is approximately 95%, meaning the vast majority of npm packages work without modification.
Does Bun have a security permission model like Deno?
No. Bun does not include a runtime permission system: programs have full access to the filesystem, network, and environment variables by default. Bun's position is that security should be enforced at the operating system and container level. Deno, by contrast, requires explicit flags like --allow-net and --allow-read for every sensitive operation.
What is Deno Deploy and does Bun have an equivalent?
Deno Deploy is a first-party managed edge hosting platform from the Deno team, with a free tier (100,000 requests per day, 1 GB KV storage) and a Pro plan at $20 per month. Bun does not have an equivalent first-party hosting product; it can run on Cloudflare Workers, Vercel Edge Functions, and standard VPS environments, but there is no Bun-native deployment platform.
Which runtime is better for a new TypeScript project in 2026?
Deno has the edge for TypeScript-first projects: it runs TypeScript natively without configuration, ships with the now-stable Temporal API (Deno 2.7), and enforces web-standard APIs that match browser behavior. Bun also runs TypeScript natively and is faster, but Deno's tighter TypeScript integration and standards alignment make it the safer long-term foundation for greenfield TypeScript services.
Can I migrate an existing Node.js project to Bun or Deno without rewriting it?
Bun is generally the lower-effort migration path, claiming over 99% Node.js API compatibility so most Node projects run with little or no code changes. Deno 2.x supports package.json and node_modules and achieves approximately 95% npm compatibility, allowing incremental adoption, but packages using native Node-API addons may need extra configuration. Both runtimes support incremental migration rather than a full rewrite.