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Deno vs QuickJS: catalog facts
Deno	QuickJS
Free The runtime is free and open source under the MIT licence. Deno Deploy, the company's…	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Command line	Windows, Command line
Permissions are denied by default; a script must be granted file, network or environment access TypeScript runs directly with no build step or configuration	Very small footprint with no external dependencies Nearly complete ES2025 support
Some npm packages that depend on Node internals still do not work A smaller ecosystem and hiring pool than Node	Interpreter rather than a JIT engine, so slower than V8 for heavy workloads Bignum extensions and the qjscalc calculator were removed
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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