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

> Check if a Buffer/Uint8Array is a [PNG](https://en.wikipedia.org/wiki/Portable_Network_Graphics) image


## Install

```
$ npm install is-png
```


## Usage

##### Node.js

```js
const readChunk = require('read-chunk'); // npm install read-chunk
const isPng = require('is-png');
const buffer = readChunk.sync('unicorn.png', 0, 8);

isPng(buffer);
//=> true
```

##### Browser

```js
(async () => {
	const response = await fetch('unicorn.png');
	const buffer = await response.arrayBuffer();

	isPng(new Uint8Array(buffer));
	//=> true
})();
```


## API

### isPng(buffer)

Accepts a Buffer (Node.js) or Uint8Array. Returns a `boolean` of whether `buffer` is a PNG image.

#### buffer

The buffer to check. It only needs the first 8 bytes.


## Related

- [file-type](https://github.com/sindresorhus/file-type) - Detect the file type of a Buffer/Uint8Array/ArrayBuffer


## License

MIT © [Sindre Sorhus](https://sindresorhus.com)