diff --git a/packages/jaeger-ui/src/utils/readJsonFile.test.js b/packages/jaeger-ui/src/utils/readJsonFile.test.js
index b2d5f457bf..8fba9ce4c2 100644
--- a/packages/jaeger-ui/src/utils/readJsonFile.test.js
+++ b/packages/jaeger-ui/src/utils/readJsonFile.test.js
@@ -67,20 +67,14 @@ describe('fileReader.readJsonFile', () => {
     return expect(p).rejects.toMatchObject(expect.any(Error));
   });
 
-  it('rejects on malform JSON', () => {
+  it('rejects malformed JSON', () => {
     const file = new File(['not-json'], 'foo.json');
     const p = readJsonFile({ file });
     return expect(p).rejects.toMatchObject(expect.any(Error));
   });
 
-  it('loads multiple JSON data', () => {
-    let fileContent;
-    try {
-      fileContent = fs.readFileSync('src/utils/fixtures/otlp2jaeger-multi-in.json.txt', 'utf-8');
-    } catch (err) {
-      console.error('Error reading file:', err);
-      throw err;
-    }
+  it('loads JSON-per-line data', () => {
+    let fileContent = fs.readFileSync('src/utils/fixtures/otlp2jaeger-multi-in.json.txt', 'utf-8');
     const file = new File([fileContent], 'multi.json', { type: 'application/json' });
     const p = readJsonFile({ file });
     expect(p).resolves.toBeDefined();
diff --git a/packages/jaeger-ui/src/utils/readJsonFile.tsx b/packages/jaeger-ui/src/utils/readJsonFile.tsx
index 2eb599a58e..d680c0df33 100644
--- a/packages/jaeger-ui/src/utils/readJsonFile.tsx
+++ b/packages/jaeger-ui/src/utils/readJsonFile.tsx
@@ -23,7 +23,7 @@ function tryParseMultiLineInput(input: string): any[] {
       const traceObj = JSON.parse(jsonString.trim());
       parsedObjects.push(traceObj);
     } catch (error) {
-      throw new Error(`Error parsing JSON at line ${index+1}: ${(error as Error).message}`);
+      throw new Error(`Error parsing JSON at line ${index + 1}: ${(error as Error).message}`);
     }
   });
 
@@ -45,7 +45,7 @@ export default function readJsonFile(fileList: { file: File }): Promise<string>
         try {
           traceObj = tryParseMultiLineInput(reader.result);
         } catch (error) {
-          reject(new Error(`Error processing JSON: ${(error as Error).message}`));
+          reject(error);
           return;
         }
       }