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The latest release of Node.js 21, introduced on October 17, 2023, brings a host of improvements, including a stable Fetch API, experimental WebSocket API support, and an advanced V8 JavaScript Engine. This update enhances HTTP request development, offers better TypeScript support, improved error handling, and introduces official support for ARM 64 Windows.

Node.js 21, released on October 17, 2023, introduces significant updates to enhance its performance and development experience. This version streamlines HTTP request development, eliminating the need for third-party libraries and complex coding. A key feature is the stable Fetch API, facilitating JavaScript development across front and back ends. Additionally, Node.js 21 supports WebSocket API in experimental mode, enabling real-time, two-way communication between servers and clients, ideal for applications like messaging and gaming.

The update also includes an advanced V8 JavaScript Engine, ensuring cross-platform compatibility and reducing developer concerns about system and hardware architecture specifics. Another notable change is the default enablement of the complete ESM implementation, aimed at improving the developer experience for ESM users while maintaining CommonJS compatibility.

Node.js 21 adds a flush option to the fs.writeFile() function, allowing data to be securely stored after write operations. The LLHTTP 9.1.2 version update enhances HTTP communication with non-standard implementations. Additionally, the release extends official support to ARM 64 Windows, elevating it to tier 2 support and including Windows binaries in Nodev 20.

Transformed into LTS, Node.js 20's migration to Node.js 21 is smooth, with features like stable test runners, a refined permission model, enhanced tracing channels, and support for single executable applications.

Other improvements in Node.js 21 include quicker startup times, better TypeScript support, more effective error handling, improved debugging, TLS 1.3 support for secure communication, and enhanced error-handling solutions.

Node.js 21's release follows a semi-annual schedule with major versions released every six months, typically between April and October, and minor patches as needed. The codename for Node.js 21 is Fermium. Users can verify their Node.js version with the Node-V command and enjoy the advanced features by downloading the latest release from the official website.

Unified internal tooling platform

Video creation mobile experiences for children

Affordable housing platform

Activation through interactive 3D & AR

Interactive brandbook for web

Digitally presenting one of the leading tech VC worldwide

Promotional campaign via a location-based web experience

Awareness campaign via web-to-social-media interactions

Simplifying banking end-user processes through digital means

A unique social platform for Asian markets

New investments digital promotion and sales enablement

In-store product customization experience

Best-in-culture curated video digital platform

VOIP native mobile experiences

One-of-a-kind puppet theater creation mobile experience

Insurtech platform with realtime car data

Viral realtime videos via web for Breast Cancer Awareness Month

Interactive in-store tablet catalogs

New console ux & interactions, e-commerce

Award-winning educational VR Safari

Unified internal tooling platform

Video creation mobile experiences for children

Affordable housing platform

Activation through interactive 3D & AR

Interactive brandbook for web

Digitally presenting one of the leading tech VC worldwide

Promotional campaign via a location-based web experience

Unified internal tooling platform

Video creation mobile experiences for children

Affordable housing platform

Activation through interactive 3D & AR

Interactive brandbook for web

Digitally presenting one of the leading tech VC worldwide

Promotional campaign via a location-based web experience

Awareness campaign via web-to-social-media interactions

Simplifying banking end-user processes through digital means

A unique social platform for Asian markets

New investments digital promotion and sales enablement

In-store product customization experience

Best-in-culture curated video digital platform

Awareness campaign via web-to-social-media interactions

Simplifying banking end-user processes through digital means

A unique social platform for Asian markets

New investments digital promotion and sales enablement

In-store product customization experience

Best-in-culture curated video digital platform

VOIP native mobile experiences

One-of-a-kind puppet theater creation mobile experience

Insurtech platform with realtime car data

Viral realtime videos via web for Breast Cancer Awareness Month

Interactive in-store tablet catalogs

New console ux & interactions, e-commerce

Award-winning educational VR Safari

VOIP native mobile experiences

One-of-a-kind puppet theater creation mobile experience

Insurtech platform with realtime car data

Viral realtime videos via web for Breast Cancer Awareness Month

Interactive in-store tablet catalogs

New console ux & interactions, e-commerce

Award-winning educational VR Safari

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