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# request-progress
[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Coverage Status][coveralls-image]][coveralls-url] [![Dependency status][david-dm-image]][david-dm-url] [![Dev Dependency status][david-dm-dev-image]][david-dm-dev-url]
[npm-url]:https://npmjs.org/package/request-progress
[downloads-image]:http://img.shields.io/npm/dm/request-progress.svg
[npm-image]:http://img.shields.io/npm/v/request-progress.svg
[travis-url]:https://travis-ci.org/IndigoUnited/node-request-progress
[travis-image]:http://img.shields.io/travis/IndigoUnited/node-request-progress.svg
[coveralls-url]:https://coveralls.io/r/IndigoUnited/node-request-progress
[coveralls-image]:https://img.shields.io/coveralls/IndigoUnited/node-request-progress.svg
[david-dm-url]:https://david-dm.org/IndigoUnited/node-request-progress
[david-dm-image]:https://img.shields.io/david/IndigoUnited/node-request-progress.svg
[david-dm-dev-url]:https://david-dm.org/IndigoUnited/node-request-progress#info=devDependencies
[david-dm-dev-image]:https://img.shields.io/david/dev/IndigoUnited/node-request-progress.svg
Tracks the download progress of a request made with [request](https://github.com/mikeal/request), giving insight of various metrics including progress percentage, download speed and time remaining.
## Installation
`$ npm install request-progress`
## Usage
```js
var fs = require('fs');
var request = require('request');
var progress = require('request-progress');
// The options argument is optional so you can omit it
progress(request('http://google.com/doodle.png'), {
throttle: 2000, // Throttle the progress event to 2000ms, defaults to 1000ms
delay: 1000, // Only start to emit after 1000ms delay, defaults to 0ms
lengthHeader: 'x-transfer-length' // Length header to use, defaults to content-length
})
.on('progress', function (state) {
// The state is an object that looks like this:
// {
// percentage: 0.5, // Overall percentage (between 0 to 1)
// speed: 554732, // The download speed in bytes/sec
// size: {
// total: 90044871, // The total payload size in bytes
// transferred: 27610959 // The transferred payload size in bytes
// },
// time: {
// elapsed: 36.235, // The total elapsed seconds since the start (3 decimals)
// remaining: 81.403 // The remaining seconds to finish (3 decimals)
// }
// }
console.log('progress', state);
})
.on('error', function (err) {
// Do something with err
})
.pipe(fs.createWriteStream('doodle.png'));
```
If the request's response does not include the `content-length` header, the values of some metrics will be `null`.
Also `speed` and `time.remaining` will be `null` until it can be calculated.
The `state` object emitted in the `progress` event is reused to avoid creating a new object for each event.
If you wish to peek the `state` object at any time, it is available in `request.progressState`.
## Tests
`$ npm test`
`$ npm test-cov` to get coverage report
## License
Released under the [MIT License](http://www.opensource.org/licenses/mit-license.php).
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