Node.js Child Processes

Child processes allow Node.js to run external commands and parallelize work. Here's how to use them effectively.

Best Practices#

Method Selection:
✓ exec: Simple commands, need shell features
✓ execFile: Known executables, security matters
✓ spawn: Large output, streaming needed
✓ fork: Node.js scripts with IPC

Security:
✓ Prefer execFile over exec
✓ Validate user input
✓ Use shell: false when possible
✓ Set appropriate cwd and env

Performance:
✓ Use process pools for heavy work
✓ Stream large data instead of buffering
✓ Limit concurrent processes
✓ Handle cleanup properly

Error Handling:
✓ Listen to 'error' events
✓ Check exit codes and signals
✓ Handle timeouts
✓ Log stderr appropriately

Child processes enable Node.js to run external commands and parallelize CPU-intensive work. Use exec for simple shell commands, spawn for streaming, and fork for Node.js worker processes with IPC. Implement process pools for heavy workloads and always handle errors appropriately.

Node.js Child Processes

Overview of Methods#

Using exec#

Using execFile#

Using spawn#

Using fork#

Process Pool#

Streaming Large Data#

Error Handling#

IPC Communication#

Cluster Module Integration#

Best Practices#

Conclusion#

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