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# p-limit [![Build Status](https://travis-ci.org/sindresorhus/p-limit.svg?branch=master)](https://travis-ci.org/sindresorhus/p-limit)

> Run multiple promise-returning & async functions with limited concurrency


## Install

```
$ npm install --save p-limit
```


## Usage

```js
const pLimit = require('p-limit');

const limit = pLimit(1);

const input = [
	limit(() => fetchSomething('foo')),
	limit(() => fetchSomething('bar')),
	limit(() => doSomething())
];

// only one promise is run at once
Promise.all(input).then(result => {
	console.log(result);
});
```


## API

### pLimit(concurrency)

Returns a `limit` function.

#### concurrency

Type: `number`
Minimum: `1` Concurrency limit. ### limit(fn) Returns the promise returned by calling `fn`. #### fn Type: `Function` Promise-returning/async function. ## Related - [p-queue](https://github.com/sindresorhus/p-queue) - Promise queue with concurrency control - [p-throttle](https://github.com/sindresorhus/p-throttle) - Throttle promise-returning & async functions - [p-debounce](https://github.com/sindresorhus/p-debounce) - Debounce promise-returning & async functions - [p-all](https://github.com/sindresorhus/p-all) - Run promise-returning & async functions concurrently with optional limited concurrency - [More…](https://github.com/sindresorhus/promise-fun) ## License MIT © [Sindre Sorhus](https://sindresorhus.com)




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