viewer.diagrams.net style simple viewer for offline environments

[VentoZwerg]

Is there a simple way to get a self-hosted viewer.diagrams.net style viewer for offline environments (LAN only, no Internet/CDN access) to work? How would one go about that? I am not talking about the editor, but a VIEWER only. Background: We host some internal IT documentation about our company infrastructure on a LAN webserver, which includes .drawio diagrams. In the worst case (Inernet down) we need to be able to still read/render these diagrams. How would I go about that?

[draw-io-triage-bot[bot]]

👋 Thank you for opening this issue!

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Summary: The user is asking how to set up a self-hosted, offline-capable viewer for .drawio diagram files on a LAN-only web server (similar to viewer.diagrams.net) so that internal IT documentation diagrams remain viewable even when internet access is unavailable.

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📝 Additional Information Needed

To help us investigate this more effectively, could you please provide:

• Have you considered self-hosting the full draw.io web application (https://github.com/jgraph/drawio) on your LAN? The draw.io web app can be served entirely from a local web server with no external dependencies, and it includes viewing capabilities.
• Have you considered pre-exporting your .drawio diagrams to SVG or PNG format so they can be viewed as standard images without needing any special viewer?
• Would embedding diagrams as SVGs (with 'embed images' and 'embed fonts' enabled during export) into your documentation pages be an acceptable approach? This would make them viewable in any browser without any JavaScript viewer.
• Are you aware that the draw.io JavaScript viewer (https://github.com/jgraph/drawio/tree/dev/src/main/webapp/js/viewer-static.js) can be self-hosted? You can serve the viewer JS file from your LAN web server instead of loading it from a CDN.

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[VentoZwerg]

Have you considered self-hosting the full draw.io web application

That would be overkill. We are looking for a viewer only.

exporting diagrams to SVG or PNG

Surely another way to approach this, but we would prefer to avoid this to be sure to always have the "latest" diagrams, not depending on a functioning export pipeline.

Are you aware that the draw.io JavaScript viewer can be self-hosted

That's exactly what I am trying to achieve. But still I see https:// requests towards https://viewer.diagrams.net, so maybe I am doing it wrong? Is there a documentation on how to self-host offline?