`postMessage(message, transfer)` (or `{ transfer }`) moves ArrayBuffers,
MessagePorts, streams and the rest to the target app instead of copying
them. The second argument is optional, so existing callers are unchanged.
The transfer list rides in the message body as well as the real transfer
list: structured clone's memory map keeps those objects identical to the
ones inside `contents`, which is how the desktop picks them out mid-relay
and keeps transferring them onward rather than leaving copies behind. Both
`messageToApp` paths carry it — the direct iframe relay and the connection
path that `launchApp()` between apps actually uses.
The desktop forwards the list as-is and lets postMessage judge it. A list
that arrived through the SDK was already validated by the browser on the
first hop, and validating again here would mean an allowlist of
transferable types that silently downgrades an unrecognised one to a copy.
A bad list only reaches us from an app that hand-wrote the envelope; that
throws without detaching anything, and is caught so it cannot escape
`ipc_listener` as an unhandled rejection.
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
The Open-Source Internet Computer!
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Puter.com
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App Store
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Developers
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X
Puter
Puter is an advanced, open-source, self-hostable internet computer designed to be feature-rich, fast, and highly extensible.
For Users
Puter's goal is to provide you with every app and feature you need to work, create, and play under one roof. From a simple Notepad and Voice Recorder to Spreadsheet and Camera, Puter wants to be the all-in-one solution for your digital life.
For Developers
Puter provides everything you need to build and publish web apps and games. From AI to Cloud Storage and Database to Serverless Workers, Puter has you covered. Puter also helps you get users! Once you build your app, you can publish it on our App Store to reach and monetize users.
Getting Started
💻 Local Development
git clone https://github.com/HeyPuter/puter
cd puter
npm install
npm start
→ This should launch Puter at http://puter.localhost:4100
🚀 Self-Hosting
Linux/macOS
curl -fsSL https://puter.com/selfhost | sh
Windows
irm https://puter.com/selfhost?os=windows | iex
→ For more details, see Self-Hosting Puter.
☁️ Puter.com
Puter is available as a hosted service at puter.com.
Support
Connect with the maintainers and community through these channels:
- Bug report or feature request? Please open an issue.
- X (Twitter): x.com/HeyPuter
- Security issues or abuse reports? security@puter.com
- Email maintainers at hi@puter.com
We are always happy to help you with any questions you may have. Don't hesitate to ask!
License
This repository, including all its contents, sub-projects, modules, and components, is licensed under AGPL-3.0 unless explicitly stated otherwise. Third-party libraries included in this repository may be subject to their own licenses.
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