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.
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.
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