The first Node.js 27 alpha arrived in October 2026 as part of a new annual release schedule, bringing newer V8 features and several Node.js API changes.
The first Node.js 27 build, v27.0.0-alpha.0.0.0, was published on October 29, 2026, and it marks the first release on the project's new annual schedule. Instead of a October major release that moved to end of life six months later without LTS, October now opens a six-month Alpha phase. The 27.0.0 Current release is planned for April 2027, with LTS promotion following in October 2027.
The alpha updates V8 from version 14.6 to 15.6, adding JavaScript features such as Iterator.zip(), Iterator.zipKeyed(), Iterator.prototype.join(), Iterator.prototype.includes(), and Math.sumPrecise(). The iterator helpers let developers pair sequences and process values lazily, without building intermediate arrays. Math.sumPrecise() uses a high-precision accumulator and rounds only once at the end, which reduces floating-point errors when summing numbers.
On the Node.js side, the experimental node:net/promises module offers listen() and connect() helpers, and net.Server becomes async iterable, making TCP code easier to write with async/await. The Virtual File System (node:vfs) is now available without a flag, and the Permission Model gains an –allow-env option. HTTP and memory defaults also change in this release, so developers should review those settings before upgrading.
Source: Node.js Design Patterns
