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This is 2026.9 documentation. Coverage here is incremental: a page exists only where 2026.9 differs or is newly documented. For any other topic, switch to Current in the version selector.
2026.9 developer notes for the TypeScript and JavaScript SDK are not on this preview yet. Use the current JS/TS SDK documentation until those notes land.
Building directly on the open-source Viewer package, or on @speckle/objectloader / @speckle/objectloader2? This is the case most likely to break silently, and it’s easy to miss in the general migration comms because it isn’t “just” an SDK or API consumer.If your application imports these packages directly — extending render pipelines, forking extensions, reading render views/batches, streaming and constructing object graphs directly, or otherwise reaching into their internals, rather than only embedding the hosted web viewer or reading data through the GraphQL/REST API — you’re exposed as soon as any data you load has been converted to the 2026.9 format. There’s no updated version of these packages to move to yet (see the note below), so the only mitigation right now is compatibility mode, which keeps your workspace’s data in the format the current packages already understand.We know that leaves you planning against a moving target: compatibility mode is currently scheduled to end on 1 November 2026, and there’s no committed date yet for updated packages that read the 2026.9 format. Those two things are linked — by 1 November, either an alpha of the affected packages will be available for developers in this position, or that deadline moves for you. We don’t yet know which, but we’re not going to leave JS/TS developers with neither. This page will be updated as soon as that’s decided.Compatibility mode isn’t self-serve. Ask us to turn it on for your workspace(s) before 1 November 2026 via speckle.community/help or your Customer Success Advisor — the sooner the better, since it can take time to reach the right person. See Who’s affected in the data model migration guide for the full picture.
JS/TS SDK notes for 2026.9 are planned for when compatibility mode turns off on 1 November 2026. For the Viewer specifically, see Viewer developer notes in 2026.9.
Last modified on September 7, 2026