fix(Rename Keys Node): Add a warning for regex that affect performance (#18911)

packages/core/nodes-testing/node-test-harness.ts

@@ -331,6 +331,20 @@ export class NodeTestHarness {
 			});
 
 			const msg = `Equality failed for "${testData.description}" at node "${nodeName}"`;
+			// When continue on fail is on the json wrapper is removed for some reason
+			const runs = output.nodeData[nodeName];
+			if (Array.isArray(runs)) {
+				for (let runIndex = 0; runIndex < runs.length; runIndex++) {
+					const run = runs[runIndex];
+					if (!Array.isArray(run)) continue;
+					for (let itemIndex = 0; itemIndex < run.length; itemIndex++) {
+						const original = run[itemIndex];
+						if (original && !original.json) {
+							run[itemIndex] = { json: { ...original } };
+						}
+					}
+				}
+			}
 			expect(resultData, msg).toEqual(output.nodeData[nodeName]);
 		});
 

packages/nodes-base/nodes/DebugHelper/test/DebugHelper.test.ts

@@ -0,0 +1,5 @@
+import { NodeTestHarness } from '@nodes-testing/node-test-harness';
+
+describe('Test DebugHelper Node', () => {
+	new NodeTestHarness().setupTests();
+});

packages/nodes-base/nodes/DebugHelper/test/ThrowAnError.workflow.json

@@ -0,0 +1,64 @@
+{
+	"nodes": [
+		{
+			"parameters": {},
+			"type": "n8n-nodes-base.manualTrigger",
+			"typeVersion": 1,
+			"position": [-448, 192],
+			"id": "9f62b838-ecbe-4012-8026-9e3d48669c49",
+			"name": "When clicking ‘Execute workflow’"
+		},
+		{
+			"parameters": {},
+			"type": "n8n-nodes-base.debugHelper",
+			"typeVersion": 1,
+			"position": [-224, 192],
+			"id": "7d381110-e62e-4911-8527-e6265fe4be11",
+			"name": "DebugHelper",
+			"onError": "continueErrorOutput"
+		},
+		{
+			"parameters": {},
+			"type": "n8n-nodes-base.noOp",
+			"typeVersion": 1,
+			"position": [0, 192],
+			"id": "0a6ef4ec-3876-4d99-998e-9ba26ca474b5",
+			"name": "No Operation, do nothing"
+		}
+	],
+	"connections": {
+		"When clicking ‘Execute workflow’": {
+			"main": [
+				[
+					{
+						"node": "DebugHelper",
+						"type": "main",
+						"index": 0
+					}
+				]
+			]
+		},
+		"DebugHelper": {
+			"main": [
+				[],
+				[
+					{
+						"node": "No Operation, do nothing",
+						"type": "main",
+						"index": 0
+					}
+				]
+			]
+		}
+	},
+	"pinData": {
+		"No Operation, do nothing": [
+			{
+				"error": "Node has thrown an error"
+			}
+		]
+	},
+	"meta": {
+		"instanceId": "27cc9b56542ad45b38725555722c50a1c3fee1670bbb67980558314ee08517c4"
+	}
+}

packages/nodes-base/nodes/RenameKeys/RenameKeys.node.ts

@@ -9,7 +9,6 @@ import type {
 	INodeType,
 	INodeTypeDescription,
 } from 'n8n-workflow';
-
 interface IRenameKey {
 	currentKey: string;
 	newKey: string;
@@ -81,7 +80,7 @@ export class RenameKeys implements INodeType {
 						displayName: 'Regex',
 						name: 'regexReplacement',
 						placeholder: 'Add new regular expression',
-						description: 'Adds a regular expressiond',
+						description: 'Adds a regular expression',
 						type: 'fixedCollection',
 						typeOptions: {
 							multipleValues: true,
@@ -149,11 +148,21 @@ export class RenameKeys implements INodeType {
 				],
 			},
 		],
+		hints: [
+			{
+				type: 'warning',
+				message:
+					'Complex regex patterns like nested quantifiers .*+, ()*+, or multiple wildcards may cause performance issues. Consider using simpler patterns like [a-z]+ or \\w+ for better performance.',
+				displayCondition:
+					'={{ $parameter.additionalOptions.regexReplacement.replacements && $parameter.additionalOptions.regexReplacement.replacements.some(r => r.searchRegex && /(\\.\\*\\+|\\)\\*\\+|\\+\\*|\\*.*\\*|\\+.*\\+|\\?.*\\?|\\{[0-9]+,\\}|\\*{2,}|\\+{2,}|\\?{2,}|[a-zA-Z0-9]{4,}[\\*\\+]|\\([^)]*\\|[^)]*\\)[\\*\\+])/.test(r.searchRegex)) }}',
+				whenToDisplay: 'always',
+				location: 'outputPane',
+			},
+		],
 	};
 
 	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
 		const items = this.getInputData();
-
 		const returnData: INodeExecutionData[] = [];
 
 		let item: INodeExecutionData;
@@ -208,6 +217,7 @@ export class RenameKeys implements INodeType {
 			newItem.json = renameObjectKeys(newItem.json, depth as number);
 		};
 		for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
+			try {
 				renameKeys = this.getNodeParameter('keys.key', itemIndex, []) as IRenameKey[];
 				const regexReplacements = this.getNodeParameter(
 					'additionalOptions.regexReplacement.replacements',
@@ -236,6 +246,17 @@ export class RenameKeys implements INodeType {
 				regexReplacements.forEach(regexReplaceKey);
 
 				returnData.push(newItem);
+			} catch (error) {
+				if (this.continueOnFail()) {
+					const executionErrorData = this.helpers.constructExecutionMetaData(
+						this.helpers.returnJsonArray({ error: error.message }),
+						{ itemData: { item: itemIndex } },
+					);
+					returnData.push(...executionErrorData);
+					continue;
+				}
+				throw error;
+			}
 		}
 
 		return [returnData];