Writing error info to a log?

[stephen-last]

I need to log error information to a morgan log, but I'm unsure how to do this, there don't seem to be any examples to look at.

import express from 'express'
import morgan from 'morgan'

const router = express.Router()

morgan.token('something', (req, res) => req.something)

const options = {
  stream: rfs('api.log', {
    interval: '2d',
    size: '10M',
    path: path.join(__dirname, '/../../../', 'logs')
  })
}

router.use((req, res, next) => {
  req.something = '123 abc'
  next()
})

router.use(morgan(`:date[iso] :something`, options))

router.use('/', (req, res) => {
  res.send('hello')
})

router.use('/', (err, req, res) => {
  // we have an err object here!
  res.send('error')
})

So the above will log 123 abc when res.send() is called.

How do I get info from the error object into the log..?

[dougwilson]

Hi @stephen-last this module is really just for access-log-style logging, usually doesn't contain actual errors. But if you want to have them, then just save the error in your error handler at the bottom to like req.error = err and then you can access req.error in your custom token. I hope that helps!