Question 1

How to kill a process by port number in Node.js?

Accepted Answer

Use fkill with a colon prefix, like fkill(':8080'). It automatically finds and terminates the process listening on that port across macOS, Linux, and Windows, simplifying port management.

Question 2

fkill vs using child_process.exec for killing processes?

Accepted Answer

fkill is more reliable and cross-platform than manually invoking kill or taskkill commands. It handles OS differences and offers advanced features like timeout-based force kills, reducing boilerplate code.

Question 3

How to handle errors when a process doesn't exist with fkill?

Accepted Answer

By default, fkill throws an error for non-existent processes. Use the silent: true option to suppress errors, but this should be avoided in debugging scenarios to prevent hidden issues.

Question 4

Can fkill kill child processes on Linux or macOS?

Accepted Answer

No, the tree option for killing child processes is only supported on Windows. On Linux and macOS, you may need additional logic to manage child processes separately.

Question 5

How to wait for a process to exit gracefully with fkill?

Accepted Answer

Use the waitForExit option with a millisecond timeout, e.g., fkill('chrome', {waitForExit: 2000}). This waits for the process to exit naturally before proceeding or timing out.

Question 6

Is fkill safe for production use in Node.js apps?

Accepted Answer

Generally yes, but avoid silent: true in production to ensure errors are logged. Be mindful of platform-specific behaviors, such as tree killing limitations, and test thoroughly across OSes.

fkill

What is fkill?

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Frequently Asked Questions