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Deno vs Jest: catalog facts
Deno	Jest
Free The runtime is free and open source under the MIT licence. Deno Deploy, the company's…	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, 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	Works without configuration on most projects Built-in mocking, snapshots and coverage
Some npm packages that depend on Node internals still do not work A smaller ecosystem and hiring pool than Node	Limited to JavaScript and TypeScript projects Unit testing only; browser end-to-end tests need another tool
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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