diff --git a/app/api/csv/arrangeThesauri.ts b/app/api/csv/arrangeThesauri.ts
index f9882e7755..ee0bb890e6 100644
--- a/app/api/csv/arrangeThesauri.ts
+++ b/app/api/csv/arrangeThesauri.ts
@@ -21,15 +21,12 @@ import { LabelInfoBase } from './typeParsers/select';
 import { headerWithLanguage } from './csvDefinitions';
 
 class ArrangeThesauriError extends Error {
-  source: Error;
-
   row: CSVRow;
 
   index: number;
 
   constructor(source: Error, row: CSVRow, index: number) {
-    super(source.message);
-    this.source = source;
+    super(source.message, { cause: source });
     this.row = row;
     this.index = index;
   }
@@ -163,9 +160,7 @@ const tryAddingLabel = (
   const map = thesauriValueData[id];
   if (isStandaloneGroup(map, labelInfo)) {
     throw new Error(
-      `The label "${
-        labelInfo.label
-      }" at property "${name}" is a group label in line:\n${JSON.stringify(row)}`
+      `The label "${labelInfo.label}" at property "${name}" is a group label in line:\n${JSON.stringify(row)}`
     );
   }
   const { childInfo, parentInfo } = pickParentChild(labelInfo);
diff --git a/app/api/files/S3Storage.ts b/app/api/files/S3Storage.ts
index 9d5023fcfe..a456ef3110 100644
--- a/app/api/files/S3Storage.ts
+++ b/app/api/files/S3Storage.ts
@@ -9,11 +9,8 @@ import {
 import { config } from 'api/config';
 
 class S3TimeoutError extends Error {
-  readonly s3TimeoutError: Error;
-
-  constructor(s3TimeoutError: Error) {
-    super(s3TimeoutError.message);
-    this.s3TimeoutError = s3TimeoutError;
+  constructor(cause: Error) {
+    super(cause.message, { cause });
   }
 }
 
diff --git a/app/api/utils/handleError.js b/app/api/utils/handleError.js
index d2690f2d65..044121352a 100644
--- a/app/api/utils/handleError.js
+++ b/app/api/utils/handleError.js
@@ -1,11 +1,12 @@
-import { legacyLogger } from 'api/log';
 import Ajv from 'ajv';
-import { createError } from 'api/utils/index';
-import { appContext } from 'api/utils/AppContext';
 import { UnauthorizedError } from 'api/authorization.v2/errors/UnauthorizedError';
 import { ValidationError } from 'api/common.v2/validation/ValidationError';
 import { FileNotFound } from 'api/files/FileNotFound';
 import { S3TimeoutError } from 'api/files/S3Storage';
+import { legacyLogger } from 'api/log';
+import { appContext } from 'api/utils/AppContext';
+import { createError } from 'api/utils/index';
+import util from 'node:util';
 
 const ajvPrettifier = error => {
   const errorMessage = [error.message];
@@ -60,11 +61,11 @@ const prettifyError = (error, { req = {}, uncaught = false } = {}) => {
   let result = error;
 
   if (error instanceof Error) {
-    result = { code: 500, message: error.stack, logLevel: 'error' };
+    result = { code: 500, message: util.inspect(error), logLevel: 'error' };
   }
 
   if (error instanceof S3TimeoutError) {
-    result = { code: 408, message: `${error.message}\n${error.stack}`, logLevel: 'debug' };
+    result = { code: 408, message: util.inspect(error), logLevel: 'debug' };
   }
 
   if (error instanceof Ajv.ValidationError) {
diff --git a/app/api/utils/specs/handleError.spec.js b/app/api/utils/specs/handleError.spec.js
index da496cf627..840486b144 100644
--- a/app/api/utils/specs/handleError.spec.js
+++ b/app/api/utils/specs/handleError.spec.js
@@ -1,10 +1,11 @@
-import { createError } from 'api/utils';
 import { legacyLogger } from 'api/log';
+import { createError } from 'api/utils';
 
 import { errors as elasticErrors } from '@elastic/elasticsearch';
+import { S3TimeoutError } from 'api/files/S3Storage';
 import { appContext } from 'api/utils/AppContext';
+import util from 'node:util';
 import { handleError, prettifyError } from '../handleError';
-import { S3TimeoutError } from 'api/files/S3Storage';
 
 const contextRequestId = '1234';
 
@@ -48,7 +49,7 @@ describe('handleError', () => {
         handleError(error);
 
         expect(legacyLogger.error).toHaveBeenCalledWith(
-          `requestId: ${contextRequestId} \n${error.stack}
+          `requestId: ${contextRequestId} \n${util.inspect(error)}
 original error: {
  "name": "ConnectionError",
  "meta": {