nodejs

Node.js Examples

JavaScript/Node.js scripts for monitoring cron jobs with DeadManPing.

Quick Start

1. No dependencies required - uses built-in Node.js modules
2. Replace YOUR_MONITOR_ID in each script with your actual monitor ID from deadmanping.com
3. Make script executable: chmod +x script.js
4. Add to crontab: 0 3 * * * /usr/bin/node /path/to/script.js

Examples

Basic Monitoring

• detect_empty_backup_file_cron.js - Detect when backup files are empty
• verify_cron_job_actually_ran.js - Verify job execution with timestamps
• verify_cron_job_completed.js - Confirm job finished successfully

Error Detection

• cron_job_exit_code_not_zero.js - Check exit codes
• cron_job_exit_status_check.js - Verify exit status
• detect_cron_job_wrong_exit_code.js - Detect false success

Silent Failures

• silent_cron_failures.js - Detect silent failures with process handlers
• cron_job_silent_failure_detection.js - Always ping on success

Backup Monitoring

• detect_empty_backup_file.js - Check backup file size
• detect_backup_file_missing.js - Verify backup file exists
• backup_file_zero_bytes.js - Detect zero-byte backups
• verify_backup_file_size.js - Validate file size ranges

API Response Validation

• curl_success_but_wrong_response.js - Validate API responses
• curl_returns_200_but_wrong_data.js - Check response body content

Output Validation

• verify_cron_output.js - Validate script output
• verify_script_output_content.js - Check output content

Advanced

• detect_cron_job_partial_failure.js - Verify multi-step jobs
• cron_job_returns_success_but_fails.js - Validate results
• cron_job_not_executing.js - Detect non-execution
• detect_cron_job_skipped.js - Catch skipped jobs

Best Practices

1. Use process handlers - process.on('exit') and process.on('uncaughtException') to catch failures
2. Check results - Don't just trust exit codes, verify actual results
3. Handle async errors - Use .catch() for async functions
4. Use try-catch - Wrap execSync in try-catch to handle exit codes
5. Validate JSON - Always validate JSON responses before using

Dependencies

All examples use only built-in Node.js modules:

• fs - File system operations
• child_process - Running shell commands
• https - HTTP requests

No npm install required!

Documentation

See deadmanping.com for detailed documentation on each problem and solution.