How to Log Full Stack Trace with Winston 3?

Question

My logger is set up like:

const myFormat = printf(info => {    return `${info.timestamp}: ${info.level}: ${info.message}: ${info.err}`;  });    const logger =    winston.createLogger({    level: "info",    format: combine(timestamp(), myFormat),     transports: [      new winston.transports.File({      filename:       "./logger/error.log",         level: "error"     }),      new winston.transports.File({        filename:        "./logger/info.log",        level: "info"    })   ] }) 

Then I am logging out some error like this:

logger.error(`GET on /history`, { err }); 

How is it possible to log the full stack trace for errors to via the error transport? I tried passing in the err.stack and it came out as undefined.

Thanks !

Answer 1

For winston version 3.2.0+, following will add stacktrace to log output:

import { createLogger, format, transports } from 'winston';  const { combine, timestamp, prettyPrint, colorize, errors,  } = format;   const logger = createLogger({   format: combine(     errors({ stack: true }), // <-- use errors format     colorize(),     timestamp(),     prettyPrint()   ),   transports: [new transports.Console()], });   

Ref: https://github.com/winstonjs/winston/issues/1338#issuecomment-482784056