Blender Market – Node Preview v1.13 (Mac/Win/Ubuntu)

Changelog:

v1.13:

Fixed background process sometimes not starting on macOS
Fixed a minor bug where an operator poll function would raise an Exception instead of simply returning False

This addon displays rendered thumbnails above Cycles shader nodes.

Required OS: Windows 10/11, Ubuntu 18.04/19.10/20.04, or macOS (Catalina or newer)
Blender version: 2.80 to 3.3


Features
For each node, a preview thumbnail is rendered
On edits, all affected nodes are automatically updated
Previews are rendered in a background process to keep the Blender interface fluid and responsive
No changes are made to the .blend, others without the addon can still open your scenes without problems
High-resolution displays supported (works with Blender's resolution scale feature)

Caveats
Only Cycles nodes are supported. Previews are not generated for special Eevee nodes like "Shader to RGB", or for nodes from other render engines. However, Eevee is compatible with almost all Cycles nodes, so the addon can still be useful even if you render with Eevee
To show previews for packed images, the .blend file has to be saved to disk first, because they are loaded through linking from the .blend file
Thumbnails of image sequences are not updated when changing frames
Open Shading Language script nodes are currently not supported
IES nodes are currently not supported
On macOS, the M1 processor is not supported yet, so you'll have to run Blender in Intel mode to use the addon there, or compile for the M1 architecture yourself


http://blendermarket.com/products/node-preview

To Update:

Open the user preferences, navigate to the addon and disable the addon
Restart Blender
Open the user preferences again, click "Install" and choose the new zip package of Node Preview
Re-enable the addon