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Express insights
Open Source
Versions: [5.2.1]
102 metrics
OpenTelemetry
·
Prometheus
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CloudWatch
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Datadog
Stripe
Webhook signature verification fails when body is parsed before validation
critical
stripe.event.count
bizarro.dev.to
26d ago
▸
Express
Event-loop stalls invisible without direct lag measurement
critical
express.eventloop.lag.max
express.eventloop.lag.p99
express.eventloop.lag.p50
medium.com
1mo ago
▸
Express
APM sampling hides frequent short event-loop stalls
warning
express.http.request.duration
medium.com
1mo ago
▸
Express
Average latency masks event-loop stall tail latency
warning
express.http.response_time.95percentile
express.nodejs.active_requests.total
medium.com
1mo ago
▸
Express
Event-loop stalls occur without CPU spikes
warning
express.process.cpu_user_seconds.total
express.process.cpu_system_seconds.total
medium.com
1mo ago
▸
Express
GC pauses cause stop-the-world event-loop stalls
warning
express.nodejs.gc_duration_seconds
express.nodejs.heap_size_used_bytes
express.nodejs.heap_size_total_bytes
medium.com
1mo ago
▸
Express
Synchronous logging stalls event loop under load
warning
medium.com
1mo ago
▸
Express
Ignored stream backpressure causes event-loop stalls
warning
medium.com
1mo ago
▸
Express
Event-loop stalls cause timeouts without error rate increase
critical
express.eventloop.lag.p99
express.nodejs.active_requests.total
medium.com
1mo ago
▸
Express
Compressing small responses adds CPU overhead without benefit
info
toolstac.com
grizzlypeaksoftware.com
1mo ago
▸
Express
GC percentage above 10% indicates memory allocation problem
warning
express.nodejs.gc_duration_seconds
grizzlypeaksoftware.com
1mo ago
▸
Express
Synchronous file operations block event loop for all requests
critical
grizzlypeaksoftware.com
1mo ago
▸
Express
Event loop lag exceeding 50ms indicates blocking operations
warning
express.eventloop.lag.p99
express.eventloop.lag.mean
grizzlypeaksoftware.com
1mo ago
▸
Express
Inconsistent object shapes prevent V8 optimization
warning
grizzlypeaksoftware.com
1mo ago
▸
Express
String concatenation in loops causes quadratic memory allocation
warning
grizzlypeaksoftware.com
1mo ago
▸
Express
Large JSON serialization blocks event loop for 100ms+
warning
grizzlypeaksoftware.com
1mo ago
▸
Express
Creating database connections per request exhausts pool
critical
grizzlypeaksoftware.com
1mo ago
▸
Express
Using delete operator causes V8 deoptimization
info
grizzlypeaksoftware.com
1mo ago
▸
Express
Polymorphic functions force V8 to generate slow generic code
warning
grizzlypeaksoftware.com
1mo ago
▸
Express
Global middleware applies expensive operations to all routes
warning
grizzlypeaksoftware.com
1mo ago
▸
Express
Cache failure must not cascade to application outage
critical
grizzlypeaksoftware.com
1mo ago
▸
Express
Loading entire uploaded files into memory causes OOM
critical
grizzlypeaksoftware.com
1mo ago
▸
Express
SELECT * queries waste memory and bandwidth on unused columns
warning
grizzlypeaksoftware.com
1mo ago
▸
Express
Unnecessary closures in hot paths increase memory allocation
info
grizzlypeaksoftware.com
1mo ago
▸
Express
Synchronous logging blocks event loop in production
warning
express.eventloop.lag
tracekit.dev
1mo ago
▸
Express
Async promise errors not caught in Express 4
critical
tracekit.dev
1mo ago
▸
Express
Error handler not recognized without four-argument signature
critical
tracekit.dev
1mo ago
▸
Express
External API calls hang without timeout enforcement
warning
tracekit.dev
1mo ago
▸
Express
NODE_ENV not set to production causes 3x performance degradation
warning
express.http.response_time.avg
expressjs.com
tracekit.dev
1mo ago
▸
Express
Live debugging with Inspector pauses event loop and halts traffic
critical
express.eventloop.lag
tracekit.dev
1mo ago
▸
