pretty error format for node

format.js

require('longjohn')
var prettyjson = require('prettyjson')
function formatJson(object) {
  // adds 4 spaces in front of each line
  var json = prettyjson.render(object)
  json = json.split('\n').join('\n    ')
  return '    ' + json
}
function playNiceError(error) {
  // remove longjohn properties that break prettyjson
  delete error.__cached_trace__
  delete error.__previous__
  // remove domain information we probably don't need
  delete error.domain
}
function logError(error) {
  playNiceError(error)
  // Adding for fun; not for real use
  error.code = '500B'
  var metadata = formatJson(error)
  var stack = error.stack.trim()
  message = stack + '\n'
  if (metadata.trim() !== '') {
    message += '  Metadata:\n' + metadata 
  }
  console.error(message)
}
process.on('uncaughtException', logError)
function throwError() { throw new Error('foo') }
setTimeout(throwError, Math.random()*1000)