Create HTTP errors for Express, Koa, Connect, etc. with ease.

Install

This is a Node.js module available through the npm registry. Installation is done using the npm install command:

$ npm install http-errors

Example

var createError = require('http-errors')
var express = require('express')
var app = express()
 
app.use(function (req, res, next) {
  if (!req.user) return next(createError(401, 'Please login to view this page.'))
  next()
}) 

API

This is the current API, currently extracted from Koa and subject to change.

Error Properties

expose - can be used to signal if message should be sent to the client, defaulting to false when status >= 500
headers - can be an object of header names to values to be sent to the client, defaulting to undefined. When defined, the key names should all be lower-cased
message - the traditional error message, which should be kept short and all single line
status - the status code of the error, mirroring statusCode for general compatibility
statusCode - the status code of the error, defaulting to 500

createError([status], [message], [properties])

Create a new error object with the given message msg. The error object inherits from createError.HttpError.

var err = createError(404, 'This video does not exist!')

status: 500 - the status code as a number
message - the message of the error, defaulting to node's text for that status code.
properties - custom properties to attach to the object

createError([status], [error], [properties])

Extend the given error object with createError.HttpError properties. This will not alter the inheritance of the given error object, and the modified error object is the return value.

fs.readFile('foo.txt', function (err, buf) {
  if (err) {
    if (err.code === 'ENOENT') {
      var httpError = createError(404, err, { expose: false })
    } else {
      var httpError = createError(500, err)
    }
  }
}) 

status - the status code as a number
error - the error object to extend
properties - custom properties to attach to the object

new createError[code || name]([msg]))

Create a new error object with the given message msg. The error object inherits from createError.HttpError.

var err = new createError.NotFound()

code - the status code as a number
name - the name of the error as a "bumpy case", i.e. NotFound or InternalServerError.

List of all constructors

Status Code	Constructor Name
400	BadRequest
401	Unauthorized
402	PaymentRequired
403	Forbidden
404	NotFound
405	MethodNotAllowed
406	NotAcceptable
407	ProxyAuthenticationRequired
408	RequestTimeout
409	Conflict
410	Gone
411	LengthRequired
412	PreconditionFailed
413	PayloadTooLarge
414	URITooLong
415	UnsupportedMediaType
416	RangeNotSatisfiable
417	ExpectationFailed
418	ImATeapot
421	MisdirectedRequest
422	UnprocessableEntity
423	Locked
424	FailedDependency
425	UnorderedCollection
426	UpgradeRequired
428	PreconditionRequired
429	TooManyRequests
431	RequestHeaderFieldsTooLarge
451	UnavailableForLegalReasons
500	InternalServerError
501	NotImplemented
502	BadGateway
503	ServiceUnavailable
504	GatewayTimeout
505	HTTPVersionNotSupported
506	VariantAlsoNegotiates
507	InsufficientStorage
508	LoopDetected
509	BandwidthLimitExceeded
510	NotExtended
511	NetworkAuthenticationRequired

License

[MIT](LICENSE)