windowshostingleader.com – Node.js v17.0.0 is actually a runtime program for creating (mostly) server-side applications. It is ideal referred to as a preferred suggests for JavaScript coders to make real-time Web APIs.
But Node.js® v17.0.0 will not be a JavaScript framework; indeed, numerous authors have written great frameworks specifically for Node.js® v17.0.0, which includes Express.js, Restify.js, and Hapi.js. So what specifically is this phenomenon finding its way into Net applications, operating systems wrappers, microcontrollers, and robots?
At it’s core, Node.js® v17.0.0 is actually a stripped-down, extremely customizable server engine — a proto-server, for those who will — since out of your box it does not do anything till you set it up. This proto-server processes inside a loop, ready to accept and respond to requests. Any of these requests themselves may possibly initiate other requests to some other component with the program, such as to study a file off of disk or to send a signal to spin a motor on a robot arm. That loop, called the occasion loop, will be the “runtime” aspect.
Node.js® v17.0.0 ships with workhorse connectors and libraries like those relating to HTTP, SSL, compression, filesystem access, and raw TCP and UDP. JavaScript, already tuned for any Internet browser’s event loop atmosphere for GUI and network events, is an excellent language for wiring up these connectors. It is possible to snap connectors onto the occasion loop practically as easily as you’ll be able to snap Lego parts with each other. Doing so allows you to develop a very simple, dynamic Web server in just a few lines of JavaScript.
Notable Changes
Deprecations and Removals
- [
f182b9b29f
] – (SEMVER-MAJOR) dns: runtime deprecate type coercion ofdns.lookup
options (Antoine du Hamel) #39793 - [
4b030d0573
] – doc: deprecate (doc-only) http abort related (dr-js) #36670 - [
36e2ffe6dc
] – (SEMVER-MAJOR) module: subpath folder mappings EOL (Guy Bedford) #40121 - [
64287e4d45
] – (SEMVER-MAJOR) module: runtime deprecate trailing slash patterns (Guy Bedford) #40117
OpenSSL 3.0
Node.js now includes OpenSSL 3.0, specifically quictls/openssl which provides QUIC support. With OpenSSL 3.0 FIPS support is again available using the new FIPS module. For details about how to build Node.js with FIPS support please see BUILDING.md.
While OpenSSL 3.0 APIs should be mostly compatible with those provided by OpenSSL 1.1.1, we do anticipate some ecosystem impact due to tightened restrictions on the allowed algorithms and key sizes.
If you hit an ERR_OSSL_EVP_UNSUPPORTED
error in your application with Node.js 17, it’s likely that your application or a module you’re using is attempting to use an algorithm or key size which is no longer allowed by default with OpenSSL 3.0. A command-line option, --openssl-legacy-provider
, has been added to revert to the legacy provider as a temporary workaround for these tightened restrictions.
V8 9.5
The V8 JavaScript engine is updated to V8 9.5. This release comes with additional supported types for the Intl.DisplayNames
API and Extended timeZoneName
options in the Intl.DateTimeFormat
API.
Readline Promise API
The readline
module provides an interface for reading data from a Readable stream (such as process.stdin
) one line at a time.
The following simple example illustrates the basic use of the readline
module:
import * as readline from 'node:readline/promises';
import { stdin as input, stdout as output } from 'process';
const rl = readline.createInterface({ input, output });
const answer = await rl.question('What do you think of Node.js? ');
console.log(`Thank you for your valuable feedback: ${answer}`);
rl.close();
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