V3: PreviewAny node

comfy_extras/v3/nodes_preview_any.py

@@ -0,0 +1,47 @@
+from __future__ import annotations
+
+import json
+
+from comfy_api.v3 import io, ui
+
+
+class PreviewAny(io.ComfyNodeV3):
+    """Originally implement from https://github.com/rgthree/rgthree-comfy/blob/main/py/display_any.py
+
+    upstream requested in https://github.com/Kosinkadink/rfcs/blob/main/rfcs/0000-corenodes.md#preview-nodes"""
+
+    @classmethod
+    def define_schema(cls):
+        return io.SchemaV3(
+            node_id="PreviewAny_V3",  # frontend expects "PreviewAny" to work
+            display_name="Preview Any _V3",  # frontend ignores "display_name" for this node
+            description="Preview any type of data by converting it to a readable text format.",
+            category="utils",
+            inputs=[
+                io.AnyType.Input("source"),  # TODO: does not work currently, as `io.AnyType` does not define __ne__
+            ],
+            is_output_node=True,
+        )
+
+    @classmethod
+    def execute(cls, source=None) -> io.NodeOutput:
+        value = "None"
+        if isinstance(source, str):
+            value = source
+        elif isinstance(source, (int, float, bool)):
+            value = str(source)
+        elif source is not None:
+            try:
+                value = json.dumps(source)
+            except Exception:
+                try:
+                    value = str(source)
+                except Exception:
+                    value = "source exists, but could not be serialized."
+
+        return io.NodeOutput(ui=ui.PreviewText(value))
+
+
+NODES_LIST: list[type[io.ComfyNodeV3]] = [
+    PreviewAny,
+]

nodes.py

@@ -2303,6 +2303,7 @@ def init_builtin_extra_nodes():
         "v3/nodes_controlnet.py",
         "v3/nodes_images.py",
         "v3/nodes_mask.py",
+        "v3/nodes_preview_any.py",
         "v3/nodes_primitive.py",
         "v3/nodes_webcam.py",
         "v3/nodes_stable_cascade.py",