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"Das Haus das Verrรผckte macht."

Noze.io is an attempt to carry over the Node.js ideas into pure Swift. It uses libdispatch for event-driven, non-blocking I/O. Noze.io is built around type-safe back-pressure aware pull-streams (using Swift generics) operating on batches of items. Instead of just operating on bytes, operate on batches of Unicode lines or database records or HTML responses or - you get the idea. Be efficient: Stream everything and รŸatch.

A focus is to keep the API similar to Node. Not always possible - Swift is not JavaScript - but pretty close. It comes with rechargeables included, Noze.io is self-contained and doesn't require any extra dependencies. It includes modules such as cows, leftpad, express or redis.

Noze.io works in Cocoa environments as well as on Linux. Head over to our Start page for install instructions.

Is it a good idea? You tell us. Not sure, but we think it might be, because: a) While Swift looks very much like JavaScript, it is actually a very high performance statically typed and AOT-compiled language, b) Code often looks better in Swift, mostly due to trailing-closure syntax, c) No monkey patching while still providing extensions. ~~There are cons too.~~

Shows us some code!

There is a reasonably large collection of simple, focused: Noze.io examples But here you go, the "standard" Node example, a HelloWorld httpd:

import http

http.createServer { req, res in 
  res.writeHead(200, [ "Content-Type": "text/html" ])
  res.end("<h1>Hello World</h1>")

An echo daemon, just piping the in-end of a socket into its own-out end:

import net

net.createServer { sock in
  sock.write("Welcome to Noze.io!\r\n")
  sock | sock

More complex stuff including a Todo-MVC backend can be found in the Noze.io examples. Like what you see? Head over to our Start page to get started.


Hey, we love feedback. Join the mailing list, Slack channel or just drop us an email to tell us why this is crap (or not?).

Supported Swift Versions

| OS | Swift | Xcode | Make | SPM | | ----- | ------ | --------------------------------------------------------- | ---- | ---- | | macOS | 3.0 | Xcode 8 | ๐Ÿ‘๐Ÿป | ๐Ÿ‘ | | macOS | 3.1 | Xcode 8.3 | ๐Ÿ‘๐Ÿป | ๐Ÿ‘ | | tuxOS | 3.0.2 | | ๐Ÿ‘๐Ÿป | ๐Ÿ‘ | | tuxOS | 3.1 | | ๐Ÿ‘๐Ÿป | ๐Ÿ‘ |

With the release of Swift 3 Noze.io drops support for Swift 2.x. If you are still interested in using it with 2.x, the last release is still available in the legacy/swift23 branch on GitHub.


  • We chose the traditional Swift approach: Make something barely usable, though demoable, and release it with a 3.0 version tag. Then hope that the community kicks in and fills open spots. Well kinda. It's pretty good already! ๐Ÿ˜‰

  • It already has leftpad. As well as cows ๐Ÿฎ!

  • Implements primarily the happy path. Errors will error. Presumably this will improve over time.

  • A huge strength of Node is the npm package environment and the myriads of packages available for it. Or wait, is it? Well, at least we have leftpad included. And we hope that the Swift package environment is going to grow as well.

  • There are tons of open ends in Noze.io. We welcome contributions of all kinds.


Noze.io is brought to you by The Always Right Institute and ZeeZide. We wouldn't be sad if more people would like to join the effort :-)


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0.6.5 - Mar 16, 2019

Compiles w/ Swift 5 snapshots.

0.6.4 - Jul 25, 2018

This release adds changes to please current builds of Swift 4.2, e.g. as delivered in Xcode 10 beta 4.

There is only one major change in the API - socket structs like sockaddr_in or addr_in do not carry a custom initialiser anymore. That is a:

let a = sockaddr_in()

Is not properly initialising the address anymore, instead it just returns a 0-cleared value. Instead, use one of the other convenience initialisers we provide or make, like so:

let a = sockaddr_in.make()

This affected no user code in Noze.io itself, so you probably won't hit it either.

0.6.2 - Mar 12, 2018

There was a long time bug in the routing methods (there are 3 ...) which was leaking the next closure (because that was self-referencing and in not all cases cleaning up properly).

That has been fixed and should be excellent now.

0.6.0 - Sep 30, 2017

Noze.io FF adds support for Xcode 9 and Swift 4.0.

Noze.io now compiles using both, Swift 3 (3.0, 3.1 and 3.2), as well as Swift 4. The Xcode project still defaults to Swift 3 to support older Xcode installation. Note that Xcode 9 can also compile Swift 3 (known as Swift 3.2, which can be mixed w/ Swift 4).

On the SPM side Noze.io is compiled as Swift 4 when available, otherwise as Swift 3.

Two minor enhancements:

  • add QS module from ExExpress
  • add bodyParser.Options.extended (aka use qs instead of query_string to parse query parameters)

0.5.12 - Jul 13, 2017

Added the Swiftmon/S example, a source rebuild monitor. And associated improvements to Noze.io, like in the fs.watch and child_process.spawn APIs.

Changes since 0.5.7:

  • modules:
    • events:
      • bugfix in 'once' logging (drop once listeners before emitting)
    • fs:
      • watch
        • support for recursive and directory watchers
        • bugfixes
    • child_process:
      • API changes to kill (default value, return value, etc)
  • samples:
    • Swiftmon/S - a source rebuild monitor
  • Add TCP_NODELAY option for sockets
  • Xcode 9 upgrade checks
  • Swift 3.2
    • drop @_specialize in CryptoSwift fork
    • stat hack (stat uses lstat)
    • types use .self
    • no more (Void)->Void
    • redundant conformance
    • args after varargs need a name
  • Swift 3.1 compile fixes