[59370] ALARM: "FrontEnd Alerts" in US East (Ohio)

[siddhirlpl]

Automated fix for Freshservice ticket 59370.
Confidence: 0.95
Reproduction: confirmed
Ticket: https://serviceone.freshservice.com/helpdesk/tickets/59370
OpsGenie alert: be82bbc0-dbfa-487d-870c-b9dddb5400f3-1783269253931

Investigation summary

Investigation Summary for Application Error Alert

Alert Details:
• ID: be82bbc0-dbfa-487d-870c-b9dddb5400f3-1783269253931
• Alias: US East (Ohio) - FrontEnd Alerts
• Status: open
• Created At: 2026-07-05T16:34:13.931Z
• Source: CloudWatch
• Priority: P3

1. Quick Identification Steps
   • Alert type: Application Error
   • Service: QuotesApp frontend
   • Evidence source: Prefetched CloudWatch log from /frontend/quotes-app
   • 2-minute pre-alert evidence window: 2026-07-05T16:32:13.931Z to 2026-07-05T16:34:13.931Z

What failed exactly
• The frontend click handler failed when calling toUpperCase() on a non-string value.
• Exact error: r.toUpperCase is not a function

Why it failed, with exact log evidence
• At 2026-07-05T16:33:03.206000+00:00, the frontend logged:
{"level":"ERROR","source":"frontend","message":"r.toUpperCase is not a function", ... ,"route":"/"}
• The stack trace shows the failure occurred in onClick on the QuotesApp static bundle:
TypeError: r.toUpperCase is not a function at onClick (https://qotd.rlcatalyst.com/static/js/main.2faff39b.js:102:21485)
• This indicates the UI received an unexpected value type and attempted to treat it as a string.

Impact scope
• Impact is limited to the QuotesApp frontend route /.
• Users interacting with the affected click path may see failed UI behavior or inability to complete the action tied to the quote rendering/click event.
• No evidence in the provided log suggests an infrastructure outage; this is an application-level runtime type error.

ELK / log evidence
• No ELK search was performed because the alert payload explicitly supplied the primary application error log from CloudWatch and instructed not to search unrelated ELK indexes for this alert.
• The provided evidence is sufficient to identify the faulting code path and error type.

Conclusion
• Root cause is a frontend JavaScript type mismatch: the code calls toUpperCase() on a value that is not a string.
• The failure appears to be in the QuotesAp

Confirmed root cause

In createPost (src/App.js), localStorage.setItem called updatedPosts.toUpperCase() on a posts array; arrays have no toUpperCase method, causing TypeError on Create Post click.

Reproduction steps

• Opened /workspace/random-quote and confirmed createPost in src/App.js calls updatedPosts.toUpperCase() on an array at line 46
• Ran React Testing Library reproduction: node node_modules/.cache/repro59189-rtl.js (mocks fetch for https://dummyjson.com/quotes/random, renders QuotesApp on route /)
• Waited for quote to load, then clicked the Create Post button (onClick -> createPost)

Evidence

Click handler threw TypeError: alertMessages=["Error: updatedPosts.toUpperCase is not a function"]; reproduced=true; route=/; source=src/App.js:46 updatedPosts.toUpperCase()

Files changed

• src/App.js

Verification

• Reproduction script (node node_modules/.cache/repro59189-rtl.js) — Create Post succeeds; reproduced=false; alert='New post created successfully!'
• npm test — pass (CI=true npm test -- --watchAll=false --passWithNoTests; no test files in repo)
• npm run build — pass

Fix summary

Removed the erroneous .toUpperCase() call in createPost so posts are persisted with JSON.stringify(updatedPosts), matching deletePost. Create Post now saves to localStorage without throwing, verified by the RTL reproduction script, npm test, and production build.

Remaining risks

• No automated unit/integration tests cover createPost; default npm test fails without --passWithNoTests because the repo has no test files.