Node.js is a runtime system for creating (mostly) server-side applications. It's best known as a popular means for JavaScript coders to build real-time Web APIs.

But Node.js is not a JavaScript framework; indeed, several authors have written excellent frameworks specifically for Node.js, including Express.js, Restify.js, and Hapi.js. So what exactly is this phenomenon finding its way into Web applications, operating systems wrappers, microcontrollers, and robots?

At it's core, Node.js is a stripped-down, highly customizable server engine -- a proto-server, if you will -- because out of the box it doesn't do anything until you set it up. This proto-server processes in a loop, ready to accept and respond to requests. Any of those requests themselves may initiate other requests to some other part of the system, such as to read a file off of disk or to send a signal to spin a motor on a robot arm. That loop, known as the event loop, is the "runtime" part.

Node.js ships with workhorse connectors and libraries such as those relating to HTTP, SSL, compression, filesystem access, and raw TCP and UDP. JavaScript, already tuned for a Web browser's event loop environment for GUI and network events, is a great language for wiring up these connectors. You can snap connectors onto the event loop almost as easily as you can snap Lego parts together. Doing so lets you create a simple, dynamic Web server in just a few lines of JavaScript.

If you know JavaScript, Node.js is a gentle on-ramp to asynchronous computing for the Web. And it just so happens that Node.js is suited to solve Web problems exactly of this type: integration and glue challenges, with cascading calls to API after API.

Where does Node.js not work so well? It's not totally appropriate in places where a single-threaded calculation is going to be the holdup, like some kinds of successive approximation or classification. In those instances, it's more efficient for Node.js to drop the request to an independent library that's dedicated to the task, where it can be distributed across hundreds or thousands of processors.

Node.js is maturing quickly and is being deployed in more and more mission-critical and revenue-critical systems, such as eCommerce Black Friday infrastructures. It's easy to get started with Node.js, and yet Node.js is deep enough to handle modern Web complexities. If you're building your next generation Web site -- especially APIs for mobile and Web integration -- or if you are creating something new that depends on underlying services itself, Node.js is a runtime system that could very well work for you.

Notable Changes

• [fb226ff2ee] - (SEMVER-MINOR) crypto: add rsa-pss keygen parameters (Filip Skokan) #39927
• [85206b7311] - deps: upgrade npm to 7.24.0 (npm team) #40167
• [98f56d179c] - deps: update Acorn to v8.5.0 (Michaël Zasso) #40015
• [9655329772] - doc: add Ayase-252 to collaborators (Qingyu Deng) #40078
• [59fff925be] - (SEMVER-MINOR) fs: make open and close stream override optional when unused (Antoine du Hamel) #40013
• [a63a4bce90] - (SEMVER-MINOR) http: limit requests per connection (Artur K) #40082
  • The maximum number of requests a socket can handle before closing keep alive connection can be set with server.maxRequestsPerSocket.
• [9a672961fa] - (SEMVER-MINOR) src: add --no-global-search-paths cli option (Cheng Zhao) #39754
  • Adds the --no-global-search-paths command-line option to not search modules from global paths like $HOME/.node_modules and $NODE_PATH.
• [fe920b6cbf] - (SEMVER-MINOR) src: make napi_create_reference accept symbol (JckXia) #39926
• [97f3072ceb] - (SEMVER-MINOR) stream: add signal support to pipeline generators (Robert Nagy) #39067

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