Node.js 19 release on October 18, 2022. It is the current release and comes with a number of new features and improvements.
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.
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 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.
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.
Node.Js 19 Updates
This is a new HTTP parser that is faster and more efficient than the previous parser.
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.
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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