# deno vs node — codebase comparison

> Canonical page: https://codevetter.com/unpack/compare/deno-vs-node

# deno vs node — codebase comparison

Node's C++ core plus npm ecosystem vs Deno's Rust/V8 single binary with permissions and web-standard APIs.

| | denoland/deno | nodejs/node |
|---|---|---|
| Scanned commit | 461f32e (2026-09-21) | 976a36a (2026-09-22) |
| Files | 3997 | 3999 |
| Primary source root | libs | src |

## deno

This is the Deno runtime monorepo — a Rust workspace (~80 crates) that builds a JavaScript/TypeScript/WebAssembly runtime on V8 and Tokio, plus the `deno` CLI that wraps it with a package manager, type checker, formatter, linter, test runner, LSP server, and single-file-binary compiler. The distinctive shape is three layers: `libs/` holds vendored foundational crates (notably `deno_core` v0.412.0 at `libs/core`, the op2 proc-macro at `libs/ops`, and a hand-rolled zero-allocation flag parser at `libs/cli_parser` that replaced clap with `const` command tables), `ext/` holds 32 self-contained extension crates that expose native ops to JS, and `runtime/`+`cli/` assemble them into the shipped binary. Everything user code touches passes through a capability permission system (`runtime/permissions/lib.rs`, ~11.7k lines) that gates read/write/net/env/sys/run/ffi/import, and the CLI is built around a lazily-memoised dependency-injection container (`CliFactory`) so that `deno fmt` never pays for the npm resolver. It targets JS/TS application developers and, increasingly, Node.js users — a large fraction of `ext/node` exists purely for npm/Node compatibility.

## node

This is the Node.js runtime itself at v26.10.0 — a C++/V8 host (src/, ~495 files) wrapping a JavaScript standard library (lib/, ~429 files) that is compiled into a V8 startup snapshot at build time. Beyond upstream-familiar surface, this tree carries several large experimental subsystems wired through the same plumbing: a `node:vfs` virtual file system that intercepts `node:fs` and the module loaders at reserved mount points under `os.devNull/vfs/<id>`, a `node:ffi` libffi-backed foreign function interface gated by a `kFFI` permission scope, a `node:dtls` endpoint/session stack, a `node --experimental-bench` benchmark runner mirroring the test runner, and a vendored Rust crate set (`deps/crates`, temporal_rs + ICU) linked as a staticlib. The audience is Node core collaborators; the distinctive engineering property is that every new capability is a triple — a CLI option in `src/node_options.cc`, a `setupX()` in `pre_execution.js` that calls `BuiltinModule.allowRequireByUsers()`, and an internal binding registered in `src/node_binding.h`.

Full evidence: https://codevetter.com/unpack/deno · https://codevetter.com/unpack/node

## Public product links

- [CodeVetter](https://codevetter.com/)
- [Download](https://codevetter.com/download)
- [Documentation](https://codevetter.com/docs/)
- [Source](https://github.com/Codevetter/codevetter)