Highlight nodes with errors in red even when workflow works fine.

server.py

@@ -444,7 +444,8 @@ class PromptServer():
                     prompt_id = str(uuid.uuid4())
                     outputs_to_execute = valid[2]
                     self.prompt_queue.put((number, prompt_id, prompt, extra_data, outputs_to_execute))
-                    return web.json_response({"prompt_id": prompt_id, "number": number})
+                    response = {"prompt_id": prompt_id, "number": number, "node_errors": valid[3]}
+                    return web.json_response(response)
                 else:
                     print("invalid prompt:", valid[1])
                     return web.json_response({"error": valid[1], "node_errors": valid[3]}, status=400)

web/scripts/api.js

@@ -202,6 +202,8 @@ class ComfyApi extends EventTarget {
 				response: await res.json(),
 			};
 		}
+
+		return await res.json();
 	}
 
 	/**

web/scripts/app.js

@@ -836,7 +836,7 @@ export class ComfyApp {
 		LGraphCanvas.prototype.drawNodeShape = function (node, ctx, size, fgcolor, bgcolor, selected, mouse_over) {
 			const res = origDrawNodeShape.apply(this, arguments);
 
-			const nodeErrors = self.lastPromptError?.node_errors[node.id];
+			const nodeErrors = self.lastNodeErrors?.[node.id];
 
 			let color = null;
 			let lineWidth = 1;
@@ -845,7 +845,7 @@ export class ComfyApp {
 			} else if (self.dragOverNode && node.id === self.dragOverNode.id) {
 				color = "dodgerblue";
 			}
-			else if (self.lastPromptError != null && nodeErrors?.errors) {
+			else if (nodeErrors?.errors) {
 				color = "red";
 				lineWidth = 2;
 			}
@@ -1413,7 +1413,7 @@ export class ComfyApp {
 		}
 
 		this.#processingQueue = true;
-		this.lastPromptError = null;
+		this.lastNodeErrors = null;
 
 		try {
 			while (this.#queueItems.length) {
@@ -1423,12 +1423,16 @@ export class ComfyApp {
 					const p = await this.graphToPrompt();
 
 					try {
-						await api.queuePrompt(number, p);
+						const res = await api.queuePrompt(number, p);
+						this.lastNodeErrors = res.node_errors;
+						if (this.lastNodeErrors.length > 0) {
+							this.canvas.draw(true, true);
+						}
 					} catch (error) {
 						const formattedError = this.#formatPromptError(error)
 						this.ui.dialog.show(formattedError);
 						if (error.response) {
-							this.lastPromptError = error.response;
+							this.lastNodeErrors = error.response.node_errors;
 							this.canvas.draw(true, true);
 						}
 						break;
@@ -1534,7 +1538,7 @@ export class ComfyApp {
 	clean() {
 		this.nodeOutputs = {};
 		this.nodePreviewImages = {}
-		this.lastPromptError = null;
+		this.lastNodeErrors = null;
 		this.lastExecutionError = null;
 		this.runningNodeId = null;
 	}