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# p-timeout [](https://travis-ci.org/sindresorhus/p-timeout)
> Timeout a promise after a specified amount of time
## Install
```
$ npm install p-timeout
```
## Usage
```js
const delay = require('delay');
const pTimeout = require('p-timeout');
const delayedPromise = delay(200);
pTimeout(delayedPromise, 50).then(() => 'foo');
//=> [TimeoutError: Promise timed out after 50 milliseconds]
```
## API
### pTimeout(input, ms, [message | fallback])
Returns a decorated `input` that times out after `ms` time.
If you pass in a cancelable promise, specifically a promise with a `.cancel()` method, that method will be called when the `pTimeout` promise times out.
#### input
Type: `Promise`
Promise to decorate.
#### ms
Type: `number`
Milliseconds before timing out.
#### message
Type: `string` `Error`<br>
Default: `'Promise timed out after 50 milliseconds'`
Specify a custom error message or error.
If you do a custom error, it's recommended to sub-class `pTimeout.TimeoutError`.
#### fallback
Type: `Function`
Do something other than rejecting with an error on timeout.
You could for example retry:
```js
const delay = require('delay');
const pTimeout = require('p-timeout');
const delayedPromise = () => delay(200);
pTimeout(delayedPromise(), 50, () => {
return pTimeout(delayedPromise(), 300);
});
```
### pTimeout.TimeoutError
Exposed for instance checking and sub-classing.
## Related
- [delay](https://github.com/sindresorhus/delay) - Delay a promise a specified amount of time
- [p-min-delay](https://github.com/sindresorhus/p-min-delay) - Delay a promise a minimum amount of time
- [p-retry](https://github.com/sindresorhus/p-retry) - Retry a promise-returning function
- [More…](https://github.com/sindresorhus/promise-fun)
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)