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Van Anh Pham
Van Anh Pham

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Unveiling the Power of Node.js 21: A Leap Forward in Web Development

Node.js, the dynamic JavaScript runtime for server-side applications, has always been at the forefront of innovation, empowering developers to create scalable and efficient web applications. The recent release, Node.js 21, unleashed a wave of enhancements, solidifying its position as a leading platform for modern web development.

Major Changes in Node.js 21

Node.js 21, released on October 17th, 2023, brings substantial improvements to performance, signaling a new era for Node.js developers. Let's delve into the key features that make this release noteworthy.

1. Fetch Stable API

In Node.js 21, developers are treated to a standardized way of developing HTTP requests, simplifying the entire procedure. This release eliminates the need for third-party libraries and complex codes for sending HTTP requests and responses, streamlining the development process.

2. WebSocket API Support

Node.js 21 introduces support for WebSocket API in experimental mode. This empowers developers to connect to WebSocket servers directly from Node.js applications without relying on third-party packages. The native integration of WebSocket capabilities opens doors for real-time, two-way communication between servers and clients, enabling applications like messengers, gaming platforms, and live updates.

3. Advanced V8 JavaScript Engine

The heart of Node.js, the V8 JavaScript engine, receives an upgrade in Node.js 21. This updated version, V8 JavaScript engine 11.8, brings improved performance and introduces new language features. Developers can benefit from enhancements like Array grouping, ArrayBuffer.prototype.transfer, and extended-const expressions in WebAssembly.

4. Default ESM Enhancements

Node.js 21 enhances the complete ESM (ECMAScript Modules) implementation, making it better suited for defaults enabled by new options. This effort aligns with the project's commitment to improving the developer experience for ESM users while preserving compatibility with CommonJS.

5. fs.writeFile() Function Update

The fs.writeFile() function in Node.js 21 now includes a flush option. This allows users to compel and flush data to permanent storage after completing write transactions, preventing data discrepancies during subsequent read operations.

6. LLHTTP 9.1.2 Version Update

The parser HTTP in Node.js 21 gains the ability to activate extra leniency flags, enhancing communication with non-standard HTTP implementations. However, caution is advised when enabling these flags to avoid potential errors.

7. Official Support for ARM 64 Windows

Node.js 21 elevates ARM 64 Windows to tier 2 support, providing official binaries for Windows users. This upgrade allows for the execution of native platforms and offers various installation options, including executable files, MSI, and zip/7z packages.

8. Transformation to LTS (Long-Term Support)

As Node.js evolves, version 21 marks a transition to LTS, bringing stability and reliability to the platform. This release introduces several changes, including stable test runners, an updated permission model, tracing channels, and a single executable application.

Performance and Security Highlights

Node.js 21 boasts a quick startup time, improved support for TypeScript, effective error handling, enhanced debugging experience, support for TLS 1.3, and better error-handling solutions. These features collectively contribute to a smoother and more efficient web app development process.


The release of Node.js 21 signifies a leap forward in security, features, and performance. Developers are encouraged to explore and embrace these exciting enhancements that address the challenges faced in web app development. Whether it's the upgraded V8 engine, bidirectional communications, or versatile testing capabilities, Node.js 21 promises an enriched development experience.

To leverage these features in your projects, download Node.js 21 from the official website. For in-depth understanding and detailed documentation, explore the official Node.js websites. Node.js 21 is not just an update; it's a comprehensive upgrade that propels the platform into a new era of web development. Dive in and unlock the potential of Node.js 21 today!

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