An Express middleware function to log incoming HTTP requests, with basic formatting of objects.

httpRequestLoggerMiddleware.js

/*
* Will accept an object, and add a carriage return to the end of each entry
* to format for console readability.
* */
const formatObject = (obj) => {
  let formattedObject = ``

  /*
  Some items might come in empty (such as params, query, body), so if it's
  empty, just skip over it.

  Also double check the item is an object, as the recursion can't check when
  called.
  */
  if (
    typeof obj === 'object' &&
    obj !== null &&
    Object.keys(obj).length
  ) {
    formattedObject += `{`
    for (const [key, value] of Object.entries(obj)) {
      // Run again on nested entries
      formattedObject += `\r\n  ${key}: ${formatObject(value)}`
    }
    formattedObject += `\r\n}`
  }
  // If it gets skipped over, just return the original object as a string.
  else formattedObject = JSON.stringify(obj)

  return formattedObject
}

export default (req, res, next) => {
  let logMessage = `Request recieved: \r\n`

  const entriesToLog = [
    'headers',
    'url',
    'method',
    'statusCode',
    'params',
    'query',
    'body'
  ]

  entriesToLog.map(entry => {
    let entryToLog = req[entry]

    if (typeof entryToLog === 'object') entryToLog = formatObject(entryToLog)

    logMessage += `${entry}: ${entryToLog}\r\n`
  })

  console.log(`${logMessage} \r---------------------------`)
  next()
}