---
title: Denque
description: "The fastest javascript implementation of a double-ended queue. Used by the official Redis, MongoDB, MariaDB & MySQL libraries for Node.js and many other libraries."
---
# Overview
Denque is a well tested, extremely fast and lightweight [double-ended queue](http://en.wikipedia.org/wiki/Double-ended_queue)
implementation with zero dependencies and includes TypeScript types.
Double-ended queues can also be used as a:
- [Stack](http://en.wikipedia.org/wiki/Stack_\(abstract_data_type\))
- [Queue](http://en.wikipedia.org/wiki/Queue_\(data_structure\))
This implementation is currently the fastest available, even faster than `double-ended-queue`, see the [benchmarks](/benchmarks).
Every queue operation is done at a constant `O(1)` - including random access from `.peekAt(index)`.
**Works on all node versions >= v0.10**
## Quick Start
Install the package:
```bash
npm install denque
```
```bash
yarn add denque
```
Create and consume a queue:
```js
const Denque = require("denque");
const denque = new Denque([1, 2, 3, 4]);
denque.shift(); // 1
denque.pop(); // 4
```
```ts
import Denque from 'denque';
const denque = new Denque([1, 2, 3, 4]);
denque.shift(); // 1
denque.pop(); // 4
```
See the [API reference documentation](/api) for more examples.
---
## Who's using it?
- [Kafka Node.js client](https://www.npmjs.com/package/kafka-node)
- [MariaDB Node.js client](https://www.npmjs.com/package/mariadb)
- [MongoDB Node.js client](https://www.npmjs.com/package/mongodb)
- [MySQL Node.js client](https://www.npmjs.com/package/mysql2)
- [Redis Node.js clients](https://www.npmjs.com/package/redis)
... and [many more](https://www.npmjs.com/browse/depended/denque).
---
Built and maintained by Invertase.