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node_modules/errorhandler/README.md
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# errorhandler
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[![NPM Version][npm-image]][npm-url]
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[![NPM Downloads][downloads-image]][downloads-url]
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[![Build Status][travis-image]][travis-url]
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[![Test Coverage][coveralls-image]][coveralls-url]
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[![Gratipay][gratipay-image]][gratipay-url]
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Development-only error handler middleware
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## Install
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```sh
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$ npm install errorhandler
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```
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## API
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```js
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var errorhandler = require('errorhandler')
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```
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### errorhandler(options)
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Create new middleware to handle errors and respond with content negotiation.
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This middleware is only intended to be used in a development environment, as
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the full error stack traces will be sent back to the client when an error
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occurs.
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#### Options
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Error handler accepts these properties in the options object.
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##### log
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Provide a function to be called with the error and a string representation of
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the error. Can be used to write the error to any desired location, or set to
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`false` to only send the error back in the response. Called as
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`log(err, str, req, res)` where `err` is the `Error` object, `str` is a string
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representation of the error, `req` is the request object and `res` is the
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response object (note, this function is invoked _after_ the response has been
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written).
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The default value for this option is `true` unless `process.env.NODE_ENV === 'test'`.
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Possible values:
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* `true`: Log errors using `console.error(str)`.
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* `false`: Only send the error back in the response.
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* A function: pass the error to a function for handling.
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## Examples
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### Simple example
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Basic example of adding this middleware as the error handler only in development
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with `connect` (`express` also can be used in this example).
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```js
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var connect = require('connect')
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var errorhandler = require('errorhandler')
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var app = connect()
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if (process.env.NODE_ENV === 'development') {
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// only use in development
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app.use(errorhandler())
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}
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```
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### Custom output location
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Sometimes you may want to output the errors to a different location than STDERR
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during development, like a system notification, for example.
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```js
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var connect = require('connect')
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var errorhandler = require('errorhandler')
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var notifier = require('node-notifier')
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var app = connect()
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if (process.env.NODE_ENV === 'development') {
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// only use in development
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app.use(errorhandler({log: errorNotification}))
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}
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function errorNotification(err, str, req) {
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var title = 'Error in ' + req.method + ' ' + req.url
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notifier.notify({
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title: title,
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message: str
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})
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}
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```
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## License
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[MIT](LICENSE)
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[npm-image]: https://img.shields.io/npm/v/errorhandler.svg
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[npm-url]: https://npmjs.org/package/errorhandler
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[travis-image]: https://img.shields.io/travis/expressjs/errorhandler/master.svg
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[travis-url]: https://travis-ci.org/expressjs/errorhandler
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[coveralls-image]: https://img.shields.io/coveralls/expressjs/errorhandler/master.svg
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[coveralls-url]: https://coveralls.io/r/expressjs/errorhandler?branch=master
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[downloads-image]: https://img.shields.io/npm/dm/errorhandler.svg
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[downloads-url]: https://npmjs.org/package/errorhandler
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[gratipay-image]: https://img.shields.io/gratipay/dougwilson.svg
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[gratipay-url]: https://www.gratipay.com/dougwilson/
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