DataJelly Guard
Production Monitoring for Your Actual Pages
Guard detects silent failures in modern JavaScript apps before users, Google, or AI crawlers notice. It checks rendered output, deploy regressions, and captures evidence on every scan.
Stop Thinking About Uptime
Your server can be "up" while your page is completely broken. Guard tells you if your page actually works.
These tools miss the failures that actually cost you money.
Not uptime monitoring
Pingdom tells you "200 OK". Your page can still be blank, broken, or missing content.
Not backend / DevOps monitoring
Logs, CPU, and metrics look fine. Meanwhile your frontend is completely broken.
Not SEO audits or crawlers
Crawlers scan occasionally. They don't catch issues right after deploy.
Not synthetic scripts you maintain
Scripts test what you define. Guard detects real breakage automatically.
What Guard Actually Is
Guard monitors real pages in production and detects what actually breaks — rendering issues, content loss, performance drops, and critical SEO signals.
Your Site Returns 200 OK — But Is It Actually Working?
Modern JavaScript apps fail in ways traditional monitoring cannot detect. No logs. No alerts. No obvious errors. Just silent failures destroying your revenue.
Site returns 200 OK
Page is completely blank
Deployment succeeds
Hydration crashes on load
Page loads normally
Pricing table disappears
Everything 'works'
Google can't index anything
These silent failures hit SEO, revenue pages, signups, and conversions.
These failures don't show up in logs. They don't trigger alerts.
They silently kill traffic, conversions, and revenue — and you won't know until it's too late.
Guard Watches Your Pages Like an Engineer Watches Production
Guard continuously scans your real pages — not your backend, not your server metrics. It builds a historical truth layer and detects when something changes in a way that matters.
Monitors selected pages, not whole domains
You choose exactly which pages matter most. Guard watches each critical page independently with page-level monitoring.
Builds historical truth layer
Every scan is compared against the previous. Guard doesn't just check — it detects meaningful change over time.
Stores HTML, Markdown, and screenshots
Full evidence for every scan. See exactly what your page looked like at any point in time.
Detects meaningful change, not just uptime
Stateful monitoring, not stateless checks. Guard knows the difference between a harmless update and a breaking change.
Most monitoring tools say your site is up.
Guard tells you if it actually works.
Render Integrity is Guard's secret weapon. Your server says 200 OK, your deploy says "success" — but the page is broken. Guard catches what every other tool misses.
Blank Page Detection
"Your deploy succeeded. Your page is live. But users see nothing — just a white screen."
Guard detects when a page renders with no meaningful content, even though the server returned 200.
Script Shell Detection
"React loaded. The shell rendered. But the app never hydrated — you're serving an empty div."
Guard identifies pages stuck in the 'loading' state — the React/Vue shell without actual content.
JavaScript Crash Detection
"A silent JS error crashed the app. No error boundary caught it. Users see a broken page."
Guard monitors console errors and detects when JavaScript failures prevent the page from rendering.
Plus: critical bundle failure detection, resource failure monitoring, and DOM/text drop detection.
Static File Monitoring — The Files Crawlers Actually Read
Add a Guard target like example.com/pricing and Guard automatically tracks the static files that search engines, AI crawlers, and browsers depend on — checking availability, syntax, and blocking issues on every scan.
robots.txtCrawl rules and access policy
sitemap.xmlIndexable URL inventory
llms.txtAI crawler guidance file
faviconsBrowser and tab identity
Availability
Guard fetches every static file on a schedule. If robots.txt returns a 4xx, your sitemap disappears, or llms.txt silently 404s — you know in 30 minutes, not after a deindexing.
Syntax Validation
Malformed XML in your sitemap, broken directives in robots.txt, or invalid llms.txt structure all get flagged. Guard parses these files the way crawlers do.
Blocking Issues
Accidentally added Disallow: /? Sitemap pointing at noindex pages? Mixed-content references? Guard catches the changes that quietly nuke your visibility.
Zero configuration. Add a Guard target and the entire static file layer for that domain is monitored automatically — alongside your page-level tests.
Lighthouse Scoring — Performance Tracked Over Time
Guard runs Google Lighthouse against every monitored page and stores the scores so you can see not just what broke, but how fast your pages are trending — across Performance, Accessibility, Best Practices, and SEO.
Latest scores · sample page
Average across 22 monitored pages
Performance
Accessibility
Best Practices
SEO
Four Core Scores
Performance, Accessibility, Best Practices, and SEO — captured per page on a fixed schedule, the same way Google measures your site.
Trend Over Time
Every run is stored. Watch scores climb after a fix or drop after a regression — with score history charts and per-page heatmaps showing run-by-run change.
Core Web Vitals Tracked
LCP, CLS, TBT, FCP, TTI, Speed Index, total bytes and DOM size — captured on every Lighthouse run so you can correlate score drops with real lab metrics.
Test results + performance, in one place. Track both whether your page works and how fast it works — without bolting on a second tool.
Weekly AI Report Cards — Your Site Health at a Glance
Every week Guard automatically generates a comprehensive AI report card — synthesizing thousands of test results into plain-English summaries with wins, risks, and prioritized next actions.
Guard: 3 active critical alerts and one failing site (chickensaas.com HTTP 502) — immediate remediation required.
Guard ran 6,377 scans across 28 pages this period. One monitored page is failing and there are 33 active alerts including 3 critical.
New report cards are generated weekly · You can also generate one on demand at any time
AI-Generated Executive Summary
Every report card opens with a plain-English headline: what happened, what's at risk, and what to do first. No dashboards to interpret — just answers.
Wins, Risks & Next Actions
Guard synthesizes Guard scans, Lighthouse scores, GSC data, and static file checks into three prioritized lists: what's going well, what needs attention, and exactly what to fix next.
Historical Trend Tracking
See your score improve (or regress) over time. Compare this week's report to last week's, track wins vs risks, and watch your site health evolve.
PAGES
25
WINS
3
RISKS
5
ACTIONS
5
Built from everything Guard watches. Guard scans, Lighthouse performance, Google Search Console, and static file checks — all synthesized by AI into one actionable weekly report.
Google Search Console — Guard + GSC Combined Analytics
Connect your Google Search Console and Guard becomes your single view of search performance meets page health. See clicks, impressions, rankings, and CTR — tied directly to Guard alerts and Lighthouse scores.
Combined GSC + Guard Analytics
The single view that ties what Google's actually showing users to what Guard is seeing on your pages.
GSC CLICKS
16
-18
IMPRESSIONS
3,622
-270%
CTR
0.44%
-0.10pp
AVG POSITION
22.9
-6.5
VISIBILITY AT RISK
1,279
impressions on warn/fail pages
GUARD HEALTH
OK 31
17 search-visible + Guard issues
ACTIVE ALERTS
29
±10 new in range
UNMONITORED PAGES
21
1 high-impression
Beautiful GSC Data Viewer
Clicks, impressions, CTR, position trends — all visualized with clean charts. Filter by site, date range, or query. Export to CSV when you need the raw data.
Page Speed & CRUX Data
Dedicated pages for Lighthouse test results and Chrome User Experience Report (CRUX) field data. See lab metrics and real-world performance side by side.
Combined Guard + GSC Insights
The killer feature: spot when a failing Guard test or new alert correlates with a real drop in search traffic. See which monitored pages drive the most search demand.
Where to Focus
Prioritized actions from Guard + Search Console — highest-impact rows surface first.
One OAuth connection, full visibility. Guard uses OAuth to read Search Console data — we never see your password and get read-only access only.
Index Coverage Assistant — Find What Google Doesn't Know About
Pages that aren't in Google's index can't drive organic traffic. Guard crawls your domain, cross-references against Search Console, and surfaces the gaps so you can promote the important ones into Guard monitoring.
Index Coverage Assistant
We crawl every URL reachable from your site, cross-reference it against Google Search Console, and surface exactly where the gaps are.
DISCOVERED
452
SEEN IN GSC
202
UNKNOWN
250
ADDED TO GUARD
2
Crawls run automatically on a schedule for each of your domains — no manual kickoff needed
1. Discover
Guard crawls your domain and finds every URL reachable from your site — internal links, sitemaps, and references. No manual URL list required.
2. Cross-Check
Each discovered URL is matched against your Google Search Console data. Seen in GSC = Google knows it. Unknown = Google may not have crawled it yet.
3. Promote to Guard
Review the URLs, add the high-value pages to Guard monitoring, and start tracking uptime, SEO, and performance going forward.
Why it's valuable
A high Unknown count usually means orphaned pages, weak internal linking, or sitemap problems — silent SEO leaks that cost you traffic. Use this assistant to spot them, fix the structural issues, and put your highest-value pages under continuous Guard monitoring.
Complete visibility into what Google knows. Discover, cross-check, and monitor — the full loop from "does Google know about this page?" to "is this page healthy in production?"
A Full Safety System for Everything That Can Break Your Page
Guard checks everything that can silently break — from transport failures to conversion-killing regressions. If it can hurt your business, Guard is watching for it.
7 categories · Every ~30 minutes · Full evidence on every scan
If it can break your page, Guard is watching for it.
What This Actually Means for Your Business
Guard doesn't just find problems — it finds them before they cost you money.
Catch deploy issues before users do
Your CI/CD pipeline says 'success.' Guard tells you if the page actually works. Catch hydration crashes, blank pages, and render failures minutes after deploy — not days later from a support ticket.
Detect SEO problems before Google does
A noindex tag gets accidentally added. Your canonical changes. OG tags disappear. Guard catches it on the next scan — before Google re-crawls and deindexes your page.
See regressions immediately, not days later
Guard's historical comparison detects meaningful change the moment it happens. No more discovering issues from a traffic drop in analytics three days later.
Stateful Monitoring, Not Stateless Checks
Guard doesn't just check your page — it detects when something changes and tells you why it matters.
Schedule
Scans run every ~30 min per page
Render
Full browser render of your page
Test
Run full safety system across 7 categories
Compare
Diff against previous scan results
Alert
Notify on meaningful changes
See What Broke — Not Just "Something Failed"
Every Guard scan gives you complete evidence. No more guessing, no more "works on my machine."
HTML Snapshot
Full rendered HTML captured and stored
AI Markdown
Clean, structured markdown version
Screenshot
Visual proof of page state
Test Results
Structured results across all tests
Historical Diff
What changed from the last scan
Real Issues Guard Detects
These aren't hypothetical. These are real failures that happen every day to production sites — and most teams don't know until it's too late.
Your deploy succeeded — but your page is blank
CI/CD pipeline green. Deployment complete. But the page renders nothing. Zero content. Your users see a white screen, and your monitoring says everything is fine.
Your pricing page lost all content after a release
A component refactor accidentally broke the pricing page. The page loads, the header renders, but the pricing table is gone. Revenue impact: immediate.
A noindex tag was accidentally added to your homepage
Someone merged a dev config to production. Your homepage now tells Google not to index it. You won't notice until organic traffic drops — days or weeks later.
Stripe failed and your checkout broke silently
A third-party script update broke the Stripe integration. The checkout page loads but the payment form never renders. No errors in your logs.
Your page loads, but Google can't extract any content
JavaScript renders correctly in Chrome. But the content requires client-side execution that search engines can't process. Your page is invisible to Google.
Without Guard, these are invisible.
With Guard, you catch them in 30 minutes.
Two Products. One Complete Visibility Layer.
Use Edge or Guard on their own — or combine them for complete visibility and protection.
Guard — The Protection Layer
Make sure your pages actually work in production — not just return 200.
- Monitor real pages, not servers
- Detect blank renders and crashes
- Track SEO signals like canonical and noindex
- Alert you when something breaks
Edge — The Visibility Layer
Make your site visible to search engines and AI — instantly.
- Serve fully rendered HTML to search engines
- Deliver clean Markdown to AI agents
- Fix indexing, metadata, and previews
- Zero code changes — runs at the edge
Better Together
Edge makes your content visible. Guard makes sure it never breaks.
Use either product on its own — or combine them for the full system.
Built for Teams That Can't Afford Blind Spots
Engineering Teams
Catch hydration crashes and render failures your logs miss. Guard sees what your CI/CD can't — what the page actually looks like after deploy.
Marketing Teams
Know immediately when SEO signals or landing pages break. Guard alerts you when noindex tags appear, OG tags vanish, or structured data breaks on your highest-traffic pages.
Founders
Don't find out your homepage broke from a customer. Guard watches your most important pages so you can ship fast without flying blind.
Related guides: Why pages break after deploy, How to test what Google sees, Why Google can't see your JavaScript site, and Lovable SEO guide. Pair Guard with DataJelly Edge for visibility + protection.
Frequently Asked Questions
If your pages drive traffic, signups, or revenue, they need page-output monitoring.
Join the waitlist and be the first to know when Guard launches. Stop finding out about production failures from your customers.
No spam · We'll only email you when Guard launches