Open Source Project


Deno is a secure runtime for JavaScript and TypeScript that is based on the V8 engine and the Rust programming language.


Deno is positioned as a secure and modern runtime for JavaScript and TypeScript, leveraging the V8 engine and crafted with the Rust programming language. It emerges as an innovative alternative to Node.js, not aiming for replacement but offering advancements in security and modern programming paradigms. Deno’s development, led by Ryan Dahl—who also created Node—signals a significant evolution in server-side JavaScript environments, emphasizing ease of use, security, and compatibility with the latest JavaScript features.

The core purpose of Deno is to deliver a scripting environment that prioritizes security and productivity for developers. It introduces a robust security model that, by default, restricts access to the file system, network, and environment variables. This design principle minimizes the risks associated with executing untrusted code, making Deno particularly suitable for secure and sandboxed applications.

Deno stands out with several distinct features and advantages:

  1. Built-in TypeScript Support: Deno supports TypeScript natively, eliminating the need for additional tooling or compilation steps to use TypeScript’s advanced type-checking and modern JavaScript features.

  2. Enhanced Security Model: Access to critical resources is denied by default, requiring explicit permission for operations like file and network access. This model significantly reduces the vulnerability surface of applications.

  3. Modern JavaScript Features: It fully embraces modern JavaScript standards, including ES modules, promises, and async/await syntax, facilitating more streamlined and maintainable codebases.

  4. No package.json or npm: Dependencies are managed through direct URL imports, which are cached locally upon their first execution. This approach simplifies dependency management and aligns with the web’s decentralized nature.

  5. Standard Library: Deno offers a rich standard library that is secure and compatible with the web, avoiding the need for third-party npm packages for common tasks.

  6. Single Executable Creation: Deno can compile scripts into single executable files, simplifying deployment and distribution of applications.

  7. Automatic Termination on Uncaught Errors: This feature enhances the reliability and security of Deno applications by preventing unhandled errors from causing unpredictable behavior.

  8. Use as a Library: Deno’s architecture allows it to be used as a library for building custom JavaScript runtimes, offering flexibility for developers to create tailored solutions.

  9. Rewritten in Go: The decision to rewrite cross-platform kernel drivers in Go instead of C++ not only improves performance and security but also modernizes the underlying architecture of the runtime environment.

Deno’s design and feature set reflect a thoughtful consideration of the needs of modern developers and the challenges of secure application development. Its emphasis on security, coupled with support for the latest JavaScript features and an innovative approach to dependency management, positions Deno as a compelling environment for developing secure, efficient, and future-proof applications.

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