WATCHLOG PRODUCT · FRONTEND

See what your users actually experience.

Core Web Vitals, real user sessions, JavaScript errors, and frontend performance — captured from real browsers, not synthetic probes.

Frontend
Core Web Vitals·Session replay·JS error capture
THE PROBLEM

Your servers are healthy. Your users are not.

Server metrics look fine. Uptime is 100%. But users are complaining about slow page loads, broken buttons, and invisible errors. Without RUM, the frontend is a black box — you see what your infrastructure reports, not what your users experience.

Frontend errors go undetected
JavaScript exceptions thrown in production are invisible until users report them.
Performance varies by device and region
A page loads in 800ms on a fast laptop. It loads in 4.2s on a mid-range phone in Asia.
User journeys break silently
A form submit fails for 12% of users. Nobody knows because the error is client-side.
WHAT'S MONITORED

Everything Real User Monitoring captures.

Real signals collected by the Watchlog Agent — available in your dashboard within 60 seconds of enabling.

Core Web Vitals
LCP, INP, and CLS tracked per page, device type, and geographic region.
Session Replay
Replay any user session as a DOM recording — see exactly what they saw, clicked, and struggled with.
JavaScript Error Capture
Every uncaught exception, unhandled rejection, and console error — with full stack traces.
Performance by Page
Load time, TTFB, render time, and resource count ranked per route.
Rage Click Detection
Sessions where users rage-clicked flagged automatically — a strong signal of broken UI.
SPA Navigation Tracking
Route changes in single-page apps tracked as page views with full performance context.
LIVE VIEW

Web Vitals — by page, device, and region.

Your frontend performance scored and segmented the way Google PageSpeed measures it.

Real User Monitoring  ·  Live
LCP
1.8s
Good
INP
142ms
Good
CLS
0.09
Needs work
TTFB
210ms
Good
PageAvg LoadLCPErrors
/checkout2.1s1.8s3
/dashboard1.4s1.2s0
/login0.9s0.8s0
/products3.2s2.9s7
CAPABILITIES

What Real User Monitoring gives you.

Core Web Vitals tracking
LCP, INP, CLS measured for every page view and trended over time.
Session replay with privacy
Full DOM session recordings with automatic PII masking for compliance.
Error grouping
Identical JS errors deduplicated and ranked by frequency and user impact.
Device and region segmentation
Understand how performance varies by OS, browser, connection type, and geography.
User journey funnel
Visualize where users drop off across multi-step flows like checkout or onboarding.
Resource waterfall
Every network request, script load, and third-party call timed per page view.
USE CASES

How engineering teams use Real User Monitoring.

Frontend performance regression

A deploy degraded LCP on /checkout from 1.2s to 4.8s. RUM shows the regression, the affected users, and the slow resource.

LCPDeploysPerformance
JavaScript error investigation

An exception is throwing on 8% of checkout sessions. RUM shows the error, stack trace, and session replay so you can reproduce it.

ErrorsSession ReplayDebug
Mobile performance optimization

Web Vitals segmented by device show mobile users have 3x worse LCP. RUM pinpoints the heavy resource causing it.

MobileVitalsOptimization
Rage click investigation

RUM surfaces sessions where users rage-clicked a button 6 times. Replay shows the button is unresponsive due to a JS error.

UXRage ClickDebug
PLATFORM FIT

Real User Monitoring inside the Watchlog platform.

RUM pairs with Synthetic Testing for proactive vs. reactive frontend visibility, APM for trace correlation on slow API calls, and Alerts for Web Vitals threshold notifications.

RUM
Real user frontend data
Synthetic Testing
Proactive vs. real user comparison
APM
Backend trace for slow API calls
Alerts
Notify on LCP or error rate threshold
QUICK START

Start Real User Monitoring in under 2 minutes.

No YAML. No complex configuration. The Watchlog Agent handles discovery automatically.

01
Install RUM SDK

Install the Watchlog RUM SDK for your frontend framework. For Vue.js, use @watchlog/rum-vue.

npm install @watchlog/rum-vue
02
Get API Key and Endpoint

Sign in to Watchlog, open the RUM page, and copy your API Key and endpoint from app.watchlog.io/rum.

https://app.watchlog.io/rum
03
Initialize RUM in Your App

Add the Watchlog RUM plugin to your frontend entry file and pass the API Key, endpoint, app name, and router.

app.use(createWatchlogRUMPlugin({ router, apiKey: 'YOUR_API_KEY', endpoint: 'https://api.watchlog.io/rum', app: 'my-vue-app', environment: 'production' }))
GET STARTED

Start monitoring with Real User Monitoring.

Core Web Vitals, session replay, and real user performance data — live in your dashboard.

Questions? Talk to us → [email protected]