Deno leads in security and TypeScript speed

Deno provides a strict permissions model that requires explicit approval for scripts to access files, networks, or environment variables. This design blocks malicious npm packages from accessing sensitive resources. Developers use flags like –allow-net or –allow-read to control access. Deno 2.6 includes advanced flags like –ignore-read and –ignore-env to refine these permissions. In the Deno runtime, unprivileged code runs in V8 and passes requests to privileged code written in Rust via serialized messages. This prevents scripts from escalating privileges without user consent. Deno is the best choice for security-conscious applications and TypeScript-first projects. Deno also includes a built-in audit tool to scan dependencies against the GitHub CVE database to identify known vulnerabilities.

Deno handles TypeScript natively.

Deno processes TypeScript in 38 ms, while Node.js takes 342 ms when using tsx. Deno 2.0 includes full package.json compatibility, making over 95% of npm packages accessible. With 106,000 GitHub stars, Deno is a peer to Node.js, which has 109,000 stars. Deno Deploy provides a managed service with 33 regions. The Pro plan costs $20 per month and allows 5 million inbound HTTP requests and 750 GiB-hr of memory.

Bun and Node.js performance comparisons

Bun reaches 52,000 requests per second in HTTP throughput tests. This speed is higher than the 29,000 requests per second from Deno and the 14,000 requests per second from Node.js. Bun completes package installations in 1 second, whereas npm 11 takes 20 seconds for a medium-sized project. Bun uses the JavaScriptCore engine and the Zig language to reach these speeds. It also uses 25% to 40% less memory than other runtimes for API servers. Bun is 4x faster than Node.js in CPU-intensive tasks, such as sorting 100,000 numbers. Anthropic acquired Bun to use it for Claude Code.

Node.js maintains 42.65% developer adoption and handles 85% of enterprise traffic. It remains the standard for large-scale operations like Netflix and Uber due to its 30-month LTS cycles. Node.js 24 is powered by V8 13.6 and includes the Undici 7 HTTP client. Node.js 24 provides experimental TypeScript support through the –experimental-strip-types flag, which removes type annotations but does not perform the type checking or handle the specialized TypeScript constructs found in Bun and Deno. This mechanism removes type annotations but does not provide full compilation. Bun provides 98% compatibility with Node.js APIs. In AWS Lambda tests, Bun cold-starts in 290 ms, while Node.js takes 940 ms.

You know the trade-offs.

Real-world migration and production behavior

Migrating from Node.js to Deno requires converting CommonJS to ES Modules. Deno 2.x uses a compatibility layer for Node.js programs. You can use the npm: specifier to import packages directly. Deno also supports running Node.js scripts directly with the node: prefix for core modules.

Migration is not always easy.

One team migrating a service to Deno 2.2 encountered a memory leak in production. The issue occurred because a third-party WebSocket library used code paths that assume Node.js net or stream internals. Deno follows browser-standard WebSocket APIs, which caused the library to behave differently. The team had to rewrite their connection management layer. Deno handles the execution of .ts and .tsx files directly.

Will the permission model eventually slow down rapid development?

Node.js remains the choice for legacy systems with heavy dependencies on Express middleware. Bun is the choice for serverless functions because its cold starts are only 8 to 15 milliseconds. Deno is the choice for security-conscious applications in finance and healthcare. For large enterprise projects, Node.js remains the most reliable option because it supports 100% of the 2.1 million npm packages.