Node.js vs Bun vs Deno
A comparison of the three major JavaScript runtimes — Node.js, Deno, and Bun — covering performance, npm compatibility, security model, and ecosystem maturity, including Bun's December 2025 acquisition by Anthropic.
Quick Answer
Node.js remains the stability-first default with the largest ecosystem; Bun is the performance-first choice with dramatically faster installs and HTTP throughput, now backed by Anthropic; Deno is the security-first choice with a strict permissions model and native TypeScript support.
Reviewed by TechLogHub Engineering Team. Last updated September 28, 2026. Updated for Bun 1.3's feature set and Anthropic's December 2025 acquisition of Bun, and Deno 2.6's resolved npm compatibility.
| Feature |  Node.js |  Bun |  Deno |
|---|---|---|---|
| Core Philosophy | Stability and ecosystem completeness | Performance and integrated tooling | Security-by-default and web standards alignment |
| npm Compatibility | 100% | >90% (passes Node.js test suite) | ~95% |
| Security Model | Full system access by default (no built-in sandboxing) | Full system access by default (like Node) | Zero permissions by default, explicit opt-in required |
| TypeScript Support | Via transpilation (ts-node, tsx, or build step) | Native, no transpilation step required | Native, built into the runtime |
| Current Version | — | Bun 1.3.11 | Deno 2.6 |
| Corporate Backing | OpenJS Foundation | Anthropic (acquired December 2025) | Deno Land Inc. |
Node.js
The original server-side JavaScript runtime, dominating enterprise applications with roughly 85% of enterprise traffic and full support for npm's entire 2.1-million-package ecosystem.
Pros
- Full, 100% compatibility with npm's entire ecosystem — no compatibility gaps
- Longest production track record and most enterprise trust of any JS runtime
- Largest talent pool and most extensive documentation, tutorials, and troubleshooting resources
- Stable, predictable LTS release cycle that large organizations plan around
- Broadest hosting and infrastructure support across every cloud provider
Cons
- Meaningfully slower than Bun on raw HTTP throughput and package installation benchmarks
- No built-in permissions model — scripts have full system access by default, unlike Deno
- Slower package installs compared to both Bun and (in most benchmarks) Deno
- Higher baseline memory usage than Bun in comparable benchmarks
Best For
Enterprise applications, teams prioritizing stability and the largest possible ecosystem compatibility, and any project where the risk tolerance for newer runtimes is low.
Bun
A performance-focused JavaScript runtime and toolkit (bundler, test runner, package manager) now at version 1.3, acquired by Anthropic in December 2025 and deployed as core infrastructure for Claude Code.
Pros
- Dramatically faster HTTP throughput — around 4x Node.js in synthetic benchmarks (up to 110,000 req/s reported)
- Extremely fast package installs — roughly 20-35x faster than npm in various benchmarks
- Native TypeScript execution with full syntax support (enums, decorators, namespaces) with no separate build step
- Built-in Postgres, MySQL, Redis, and SQLite clients reduce the need for separate database driver packages
- Now backed by Anthropic's corporate investment following the December 2025 acquisition, substantially reducing abandonment risk
Cons
- Real-world performance gains are often much smaller than synthetic benchmarks suggest once database and validation overhead are included
- Smaller production track record than Node.js, despite passing over 90% of the Node.js test suite for compatibility
- Corporate ownership by Anthropic, while reducing abandonment risk, introduces a new dependency on that company's priorities
- ARM64 and Windows native support are newer additions (v1.3.10+) with less field-testing than Node's mature cross-platform support
Best For
Teams prioritizing raw performance, fast local development iteration, and reduced tooling complexity (bundler, test runner, and package manager built in), especially for new projects without heavy legacy Node-specific dependencies.
Deno
A security-first JavaScript runtime created by Node.js's original creator, now at version 2.6, built around a permissions model where every program starts with zero access unless explicitly granted, with native TypeScript support.
Pros
- Security-by-default permissions model — scripts have zero file, network, or environment access unless explicitly granted
- Native TypeScript support built directly into the runtime with no separate configuration
- Deno 2.x resolved its historical npm incompatibility, making the vast majority of npm packages accessible
- Aligns closely with web standard APIs (fetch, Web Streams) rather than Node-specific APIs
- Built-in tooling for formatting, linting, and testing without needing separate packages
Cons
- npm compatibility, while much improved, still trails Bun and Node at roughly 95%
- Smaller ecosystem and enterprise adoption than either Node.js or Bun
- Package installs are slower than Bun's, though still faster than traditional npm in most benchmarks
- Explicit permissions model, while a security benefit, adds friction during initial development and debugging
Best For
Security-sensitive applications, projects that benefit from strict alignment with web standard APIs, and teams that want native TypeScript support with strong sandboxing guarantees by default.
Anthropic's Acquisition Changes Bun's Risk Profile
In December 2025, Anthropic acquired Bun and began deploying it as core infrastructure for Claude Code. This is a significant development for anyone evaluating Bun's long-term viability — Bun remains MIT-licensed and open source, but the corporate backing substantially reduces the abandonment risk that's historically made teams cautious about betting production infrastructure on newer, venture-backed runtimes.
Synthetic Benchmarks vs Real-World Performance
Bun's headline performance numbers (roughly 4x Node's HTTP throughput in synthetic Express-style tests) are real but can overstate the practical gap. Independent testing of a production-grade URL shortener with routing, validation, and database operations found Bun at roughly 12,400 req/sec versus Node's 12,000 — a far smaller gap once realistic application overhead is included. The performance advantage is real and matters most for I/O-heavy, latency-sensitive services, but it's worth benchmarking your actual workload rather than trusting synthetic numbers alone.
Deno's npm Compatibility Turnaround
Deno's historical biggest weakness was npm incompatibility, stemming from its original design philosophy of avoiding Node-specific APIs entirely. Deno 2.x reversed this stance, adding npm compatibility that now covers roughly 95% of packages, making the over two million packages in the npm registry accessible — a significant practical improvement that removes what was previously Deno's biggest adoption blocker.
Security as a First-Class Design Decision
Deno's zero-permissions-by-default model is architecturally distinct from both Node.js and Bun, which both grant full system access by default like traditional scripting languages. This matters most for running untrusted or third-party code, CI/CD pipelines executing external scripts, or any context where limiting a script's blast radius by default is a meaningful security requirement rather than an afterthought.
Verdict
Node.js remains the safest default for enterprise applications and teams prioritizing maximum ecosystem compatibility and stability. Bun is the strongest choice for teams prioritizing raw performance and integrated tooling, especially now with Anthropic's backing reducing long-term abandonment risk. Deno is the right fit for security-sensitive applications and teams that value its permissions model and native web standards alignment over raw ecosystem completeness. Think of it as: Node.js for stability, Bun for performance, Deno for security.