Is there a method to display logs in Node JS without relying on process.stdout.write?

I am currently experimenting with piping two Node.js scripts together, and I have found that it works well when using the following method.

How to pipe Node.js scripts together using Unix | pipe (on the command line)?

For example:

$ ./script1.js | ./script2.js

The piping process functions properly if only valid JSON data is passed on to the next script. However, I aim to include some debug logs in the first script without relying on the popular debug module. Interestingly, I know that the debug module can accomplish this task without interfering with the pipeline. How does it manage to do so? I would prefer not to delve deep into their codebase for an answer (call me lazy).

It seems that both console.log and console.error rely on process.stdout/process.stderr, meaning that any logging I implement could disrupt the pipe's flow.

Difference between "process.stdout.write" and "console.log" in Node.js?

Is there a way to utilize a different tty socket or another approach altogether for this issue? I am at a loss on where to begin.

node.js

Answer №1

It appears that the debug module available on npm writes to the standard error stream (stderr) instead:

By default, debug will log to stderr.

/**
 * Invokes `util.format()` with the specified arguments and writes to stderr.
 */

function log(...args) {
    return process.stderr.write(util.format(...args) + '\n');
}

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