How to render \ns in arbitrary data properties

[egargan]

I'd like to be able to display just the stack property when logging errors, instead of giving the whole error to Pino when logging them.

In an app of mine, I like to log out only an error's stack property, instead of just giving the entire error to Pino to display. When I do this, the stack is printed in a signle line, without rendering its \ns.

If I hand the whole error to Pino, i.e. logger.error(err), the stack is printed "prettily", broken across multiple lines.

How do I tell Pino to render my stack property's newlines? I've looked through the docs for pino-pretty's config options, but I can't find anything there that solves my problem.

[jsumners]

logger.error(err) gets serialized by the error serializer attached to the Pino instance. If you want a different serialization, you need to provide a serializer that does what you want.

[mcollina]

@jsumners I don't think that's the case.

This is currently not possible in pino-pretty. I'm not even sure how it could be implemented reliably, but it would be good PR there.

[jsumners]

The implementation here recognizes serialized errors from Pino.

[mcollina]

Yes, exactly. This is not a serialized error.

[egargan]

Yep you've got it @mcollina, I should have been clearer.

For that first second screencap I'm doing logger.error({ stack: error.stack }). I'd like this output to be nice and newliend and indented, like it is when I just do logger.error({ stack: error.stack }).

@mcollina if it's implemented for the error serializer, surely it's possible? Would it just be a case of extracting the code in this error serializer that renders newlines, and making it available as a config option?

[mcollina]

The code is very specific for errors: https://github.com/pinojs/pino-pretty/blob/master/lib/utils.js#L180.

A PR would be awesome.

[egargan]

OK I'll have a crack when I find some time!

Still a bit unsure why the \ns aren't being rendered for me though, when it seems like that's all the error serializer uses to produce multi-line output?

https://github.com/pinojs/pino-pretty/blob/master/lib/utils.js#L152

[notmedia]

@egargan Hi, did you find the solution?