Node.js overview

As an asynchronous event-driven JavaScript runtime, Node.js is designed to build scalable network applications.

Node.js is similar in design to, and influenced by, systems like Ruby's Event Machine and Python's Twisted. Node.js takes the event model a bit further. It presents an event loop as a runtime construct instead of as a library. In other systems, there is always a blocking call to start the event-loop. Typically, behavior is defined through callbacks at the beginning of a script, and at the end a server is started through a blocking call like EventMachine::run(). In Node.js, there is no such start-the-event-loop call. Node.js simply enters the event loop after executing the input script. Node.js exits the event loop when there are no more callbacks to perform. This behavior is like browser JavaScript - the event loop is hidden from the user.

HTTP is a first-class citizen in Node.js, designed with streaming and low latency in mind. This makes Nodejs well suited for the foundation of a web library or framework.

Node.js being designed without threads doesn't mean you can't take advantage of multiple cores in your environment. Child processes can be spawned by using our child_process.fork() API, and are designed to be easy to communicate with. Built upon that same interface is the cluster module, which allows you to share sockets between processes to enable load balancing over your cores.

What's new in version 24.15.0

Notable Changes

[3d87ecacbc] - (SEMVER-MINOR) cli: add --max-heap-size option (tannal) #58708
[83c38672f7] - cli: add --require-module/--no-require-module (Joyee Cheung) #60959
[54ef940e01] - (SEMVER-MINOR) crypto: add raw key formats support to the KeyObject APIs (Filip Skokan) #62240
[f4a3edc47a] - (SEMVER-MINOR) fs: add throwIfNoEntry option for fs.stat and fs.promises.stat (Juan José) #61178
[5cdcba17cc] - (SEMVER-MINOR) http2: add http1Options for HTTP/1 fallback configuration (Amol Yadav) #61713
[8b6be3fe14] - module: mark require(esm) as stable (Joyee Cheung) #60959
[68fbc0c6cc] - module: mark module compile cache as stable (Joyee Cheung) #60971
[c851e76f8c] - (SEMVER-MINOR) net: add setTOS and getTOS to Socket (Amol Yadav) #61503
[6ac4304c87] - (SEMVER-MINOR) sqlite: add limits property to DatabaseSync (Mert Can Altin) #61298
[aaf9af1672] - sqlite: mark as release candidate (Matteo Collina) #61262
[eb77a7a297] - (SEMVER-MINOR) src: add C++ support for diagnostics channels (RafaelGSS) #61869
[6834ca13bb] - (SEMVER-MINOR) stream: rename Duplex.toWeb() type option to readableType (René) #61632
[f5f21d36a6] - test_runner: add exports option for module mocks (sangwook) #61727
[1f2025fd1e] - (SEMVER-MINOR) test_runner: expose worker ID for concurrent test execution (Ali Hassan) #61394
[1ca20fc33d] - (SEMVER-MINOR) test_runner: show interrupted test on SIGINT (Matteo Collina) #61676

Full list of changes available here

Node.js for Mac

Node.js overview

What's new in version 24.15.0

Notable Changes

Node.js for Mac

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