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http-errors

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)