| Server IP : 68.183.124.220 / Your IP : 216.73.217.137 Web Server : Apache/2.4.18 (Ubuntu) System : Linux Sandbox-A 4.4.0-210-generic #242-Ubuntu SMP Fri Apr 16 09:57:56 UTC 2021 x86_64 User : gavin ( 1000) PHP Version : 7.0.33-0ubuntu0.16.04.16 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority, MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /home/gavin/workspace/readjs/node_modules/is-png/ |
Upload File : |
# is-png [](https://travis-ci.org/sindresorhus/is-png)
> Check if a Buffer/Uint8Array is a [PNG](http://en.wikipedia.org/wiki/Portable_Network_Graphics) image
Used by [image-type](https://github.com/sindresorhus/image-type).
## Install
```sh
$ npm install --save is-png
```
## Usage
##### Node.js
```js
var readChunk = require('read-chunk'); // npm install read-chunk
var isPng = require('is-png');
var buffer = readChunk.sync('unicorn.png', 0, 4);
isPng(buffer);
//=> true
```
##### Browser
```js
var xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.png');
xhr.responseType = 'arraybuffer';
xhr.onload = function () {
isPng(new Uint8Array(this.response));
//=> true
};
xhr.send();
```
## API
### isPng(buffer)
Accepts a Buffer (Node.js) or Uint8Array.
It only needs the first 4 bytes.
## License
MIT © [Sindre Sorhus](http://sindresorhus.com)