node 19

Node.js 19 release on October 18, 2022. It is the current release and comes with a number of new features and improvements.

Welcome to the world of Node.js, Additionally, where JavaScript goes beyond the confines of the browser and spreads its wings into the realm of server-side development. Picture this: a JavaScript runtime that allows you to build fast, scalable, and efficient network applications using a single language from front to back. Also, It’s like bringing the power of JavaScript to the server, turning it into a versatile tool that can handle everything from web servers to real-time chat applications.

Furthermore, Node.js, with its event-driven architecture and non-blocking I/O model, breaks away from the traditional request-response cycle, empowering developers to create highly responsive and performant applications. Besides, It’s a game-changer that has revolutionized the way we think about server-side programming.

Node.Js 19

Node.js 19 is a great choice for developers who are looking for a reliable and performant JavaScript runtime environment. It is also a good choice for developers who are looking for a secure runtime environment.

Every six months, a major update of Node.js is release. equally, For six months, the new release becomes the current one, giving library writers time to add support for it.

Odd-numbered releases, like 19, stop receiving maintenance after six months, whereas even-numbered versions, like 18, progress to the Active LTS (long-term support) status and are prepare for widespread usage.

Node.Js 19 Features and Updates

node.js 19

Node.js 19 includes some new features and improvements that make it easier for developers to create applications. Here are some of these features and updates of Node.Js 19:

Experimental node watch mode

This mode allows you to watch your code for changes and automatically restart your server when changes are made. Also, This can be helpful for development and testing.

Stable WebCrypto 

This API provides cryptographic functions for Node.js importantly, applications. So, It is now stable in Node.js 19, which means that it is ready for production use.

The WebCrypto API is an interface to build systems using cryptography that is now stable with node.js 19, with the exception of the algorithms Ed25519, Ed448, X25519, and X448.

We can use globalThis.crypto or require(‘node:crypto’).webcrypto to access this module. The following server/index.js use subtle as an example, where the SubtleCrypto interface provides a number of low-level cryptographic functions

That functions can be use to create and manage cryptographic keys, encrypt, decrypt, sign, and verify data, and more

HTTP(S)/1.1 KeepAlive by default

This feature improves performance by keeping connections open for multiple requests. The improved keepAlive feature in node 19 can provide many benefits to requests.

For each outbound HTTP(s) connection, this functionality automatically employs HTTP 1.1 Keep-Alive with a preset keep-alive time of 5 seconds. As connections are reuse, this enhances throughput.

Better performance will be achieved if keepAlive is enabled since connections are reused by default.

The agent may also analyze any keepAlive responses that the servers may send as well. This header informs the client how long to maintain the connection.

On the other hand, when close() is called, the HTTP server will instantly disconnect any idle clients. It is carrie out through HTTP (s).Server.close calls closeIdleConnections.

These adjustments may improve the throughput/performance of HTTP(S)/1.1 requests by default.

Custom ESM resolution adjustments

This feature allows you to control how ESM modules are resolve. Node.js has removed the –experimental-specifier-resolution flag, because its functionality can be achieved via custom loaders.

Dropped DTrace/SystemTap/ETW support

These debugging tools are no longer supported in Node.js 19.  Besides, There are two reasons of Node.js has dropped the support for DTrace/SystemTap/ETW:

  • There are no clear indicators anyone is using DTrace, SystemTap, or ETW.
  • The complexity to maintain and supporting these tools has proved not worth the effort.

V8 JavaScript engine is updated to V8 10.7

This update includes performance improvements and bug fixes. Node.js 19 has updated the V8 JavaScript engine to V8 10.7, which includes a new function, Intl.NumberFormat, for language-sensitive number formatting.

Node.Js 19 Updates

llhttp 8.1: 

This is a new HTTP parser that is faster and more efficient than the previous parser.

npm 8.19: 

This is a new version of the Node Package Manager that includes a number of new features and improvements.

AWS Lambda Support for Node.js 18: 

AWS Lambda now supports Node.js 18 as a managed runtime and a container base image.

Platform Support: 

Node.js 19 is supported on all major platforms, including Linux, macOS, Windows, and FreeBSD.


Finally, Node.js 19 is a significant release with a number of new features and improvements. If you are using Node.js, I recommend upgrading to version 19 to take advantage of these new features and improvements.

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