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https://github.com/expressjs/timeout

Request timeout middleware for Connect/Express
https://github.com/expressjs/timeout

javascript middleware nodejs timeout

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Request timeout middleware for Connect/Express

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README 

        
# connect-timeout



[![NPM Version][npm-image]][npm-url]

[![NPM Downloads][downloads-image]][downloads-url]

[![Build Status][travis-image]][travis-url]

[![Test Coverage][coveralls-image]][coveralls-url]

[![Gratipay][gratipay-image]][gratipay-url]



Times out a request in the Connect/Express application framework.



## Install



This is a [Node.js](https://nodejs.org/en/) module available through the

[npm registry](https://www.npmjs.com/). Installation is done using the

[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):



```sh

$ npm install connect-timeout

```



## API



**NOTE** This module is not recommend as a "top-level" middleware (i.e.

`app.use(timeout('5s'))`) unless you take precautions to halt your own

middleware processing. See [as top-level middleware](#as-top-level-middleware)

for how to use as a top-level middleware.



While the library will emit a 'timeout' event when requests exceed the given

timeout, node will continue processing the slow request until it terminates.

Slow requests will continue to use CPU and memory, even if you are returning

a HTTP response in the timeout callback. For better control over CPU/memory,

you may need to find the events that are taking a long time (3rd party HTTP

requests, disk I/O, database calls) and find a way to cancel them, and/or

close the attached sockets.



### timeout(time, [options])



Returns middleware that times out in `time` milliseconds. `time` can also

be a string accepted by the [ms](https://www.npmjs.org/package/ms#readme)

module. On timeout, `req` will emit `"timeout"`.



#### Options



The `timeout` function takes an optional `options` object that may contain

any of the following keys:



##### respond



Controls if this module will "respond" in the form of forwarding an error.

If `true`, the timeout error is passed to `next()` so that you may customize

the response behavior. This error has a `.timeout` property as well as

`.status == 503`. This defaults to `true`.



### req.clearTimeout()



Clears the timeout on the request. The timeout is completely removed and

will not fire for this request in the future.



### req.timedout



`true` if timeout fired; `false` otherwise.



## Examples



### as top-level middleware



Because of the way middleware processing works, once this module

passes the request to the next middleware (which it has to do in order

for you to do work), it can no longer stop the flow, so you must take

care to check if the request has timedout before you continue to act

on the request.



```javascript

var bodyParser = require('body-parser')

var cookieParser = require('cookie-parser')

var express = require('express')

var timeout = require('connect-timeout')



// example of using this top-level; note the use of haltOnTimedout

// after every middleware; it will stop the request flow on a timeout

var app = express()

app.use(timeout('5s'))

app.use(bodyParser())

app.use(haltOnTimedout)

app.use(cookieParser())

app.use(haltOnTimedout)



// Add your routes here, etc.



function haltOnTimedout (req, res, next) {

  if (!req.timedout) next()

}



app.listen(3000)

```



### express 3.x



```javascript

var express = require('express')

var bodyParser = require('body-parser')

var timeout = require('connect-timeout')



var app = express()

app.post('/save', timeout('5s'), bodyParser.json(), haltOnTimedout, function (req, res, next) {

  savePost(req.body, function (err, id) {

    if (err) return next(err)

    if (req.timedout) return

    res.send('saved as id ' + id)

  })

})



function haltOnTimedout (req, res, next) {

  if (!req.timedout) next()

}



function savePost (post, cb) {

  setTimeout(function () {

    cb(null, ((Math.random() * 40000) >>> 0))

  }, (Math.random() * 7000) >>> 0)

}



app.listen(3000)

```



### connect



```javascript

var bodyParser = require('body-parser')

var connect = require('connect')

var timeout = require('connect-timeout')



var app = connect()

app.use('/save', timeout('5s'), bodyParser.json(), haltOnTimedout, function (req, res, next) {

  savePost(req.body, function (err, id) {

    if (err) return next(err)

    if (req.timedout) return

    res.send('saved as id ' + id)

  })

})



function haltOnTimedout (req, res, next) {

  if (!req.timedout) next()

}



function savePost (post, cb) {

  setTimeout(function () {

    cb(null, ((Math.random() * 40000) >>> 0))

  }, (Math.random() * 7000) >>> 0)

}



app.listen(3000)

```



## License



[MIT](LICENSE)



[npm-image]: https://img.shields.io/npm/v/connect-timeout.svg

[npm-url]: https://npmjs.org/package/connect-timeout

[travis-image]: https://img.shields.io/travis/expressjs/timeout/master.svg

[travis-url]: https://travis-ci.org/expressjs/timeout

[coveralls-image]: https://img.shields.io/coveralls/expressjs/timeout/master.svg

[coveralls-url]: https://coveralls.io/r/expressjs/timeout?branch=master

[downloads-image]: https://img.shields.io/npm/dm/connect-timeout.svg

[downloads-url]: https://npmjs.org/package/connect-timeout

[gratipay-image]: https://img.shields.io/gratipay/dougwilson.svg

[gratipay-url]: https://www.gratipay.com/dougwilson/