Find overlapping execution, timezone errors, missing error recovery, resource contention, and observability gaps in scheduled tasks — before they fail at 3am.
A cron job without a lock runs twice during DST transitions. A scheduler without error handling silently stops running and nobody notices for days. Most teams write cron jobs and forget about them — until overlapping executions corrupt data, timezone bugs skip billing cycles, and missing alerts mean hours of silent failure. CronLint scans your entire codebase for scheduled task anti-patterns so your jobs run exactly once, exactly when expected.
90 checks across 6 categories, covering every aspect of scheduled task reliability and operational safety.
Detects cron jobs without file locks or mutex protection, missing idempotency guards, concurrent execution risks, no singleton enforcement, and scheduled tasks that can corrupt data when they overlap.
Finds hardcoded timezones in schedule expressions, DST transition vulnerabilities, UTC assumption errors, missing timezone configuration in scheduler setup, and schedules that skip or double-fire across DST.
Catches missing try/catch in job handlers, no retry logic on transient failures, absent dead letter queues, missing compensation actions on partial failures, and jobs that silently stop on first error.
Detects multiple jobs hitting the same database at the same minute, unbounded batch sizes, missing connection pool limits in job context, memory-intensive jobs without resource caps, and scheduling pile-ups.
Finds jobs without graceful shutdown handlers, missing SIGTERM signal handling, orphaned job processes after deploy, no cleanup on job cancellation, and scheduled tasks that leak resources across restarts.
Catches missing job duration logging, no start/end timestamps, absent heartbeat checks, missing alerting on job failures, no dead-man-switch monitoring, and jobs that fail silently without any notification.
Purpose-built for scheduled task reliability. Not a generic scheduler with a monitoring dashboard.
| Capability | CronLint | Manual Review | ESLint | SonarQube | Cronitor |
|---|---|---|---|---|---|
| Overlapping execution detection | ✓ 15 rules | Ad hoc | ✗ | ✗ | Partial |
| Timezone & DST analysis | ✓ 15 rules | Ad hoc | ✗ | ✗ | ✗ |
| Error recovery checks | ✓ 15 rules | Ad hoc | ✗ | Partial | ✗ |
| Resource contention detection | ✓ 15 rules | ✗ | ✗ | ✗ | ✗ |
| Lifecycle management | ✓ 15 rules | Ad hoc | ✗ | ✗ | ✗ |
| Observability gap detection | ✓ 15 rules | Ad hoc | ✗ | Partial | ✓ |
| Static analysis (no runtime) | ✓ | ✓ | ✓ | ✓ | ✗ |
| 100% local / zero telemetry | ✓ | ✓ | ✓ | ✗ | ✗ |
| Score & grading system | ✓ | ✗ | ✗ | ✓ | ✗ |
| Zero configuration | ✓ | N/A | ✗ | ✗ | ✗ |
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Install CronLint in 30 seconds. Find every overlap risk, timezone bug, and silent failure before your scheduled tasks find them for you.