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QA NoteTutorial

01API 500 Error

BeginnerTeam Invite Form

BeginnerE-commerce Product Card

03Unhandled Promise

IntermediateDashboard Analytics Chart

04Network Timeout

IntermediateIssue List Search

05Missing Validation

BeginnerProfile Settings Form

06Infinite Re-render

AdvancedReal-time Notification Panel

IntermediateCheckout Address Autocomplete

08z-index Conflict

IntermediateDatePicker in Modal

09CLS Layout Shift

AdvancedNews Article

10Accessibility Violation

AdvancedMulti-step Sign Up

03Unhandled Promise — Analytics Chart

3/10

1

Select "Last 90 days" from the period filter

30-day data is currently displayed normally.

Check the error

Check the TypeError in console

Capture with the extension

Captured Data

• JS Errors: TypeError — Cannot read properties of null (reading 'map')
• Network: GET /api/demo/analytics?period=90d → 200 (empty response)
• Console: error-level logs (with stack trace)

A

Analytics Pro

Total Visitors

12,847

+12.5%

Page Views

48,291

+8.3%

Conversion Rate

3.2%

+0.4%

Visitor Trend

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QA Note Tutorial | QA Note