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# URL Toolkit
Lightweight library to build an absolute URL from a base URL and a relative URL, written from [the spec (RFC 1808)](https://tools.ietf.org/html/rfc1808). Initially part of [HLS.JS](https://github.com/dailymotion/hls.js).
## Methods
### `buildAbsoluteURL(baseURL, relativeURL, opts={})`
Build an absolute URL from a relative and base one.
```javascript
URLToolkit.buildAbsoluteURL('http://a.com/b/cd', 'e/f/../g'); // => http://a.com/b/e/g
```
If you want to ensure that the URL is treated as a relative one you should prefix it with `./`.
```javascript
URLToolkit.buildAbsoluteURL('http://a.com/b/cd', 'a:b'); // => a:b
URLToolkit.buildAbsoluteURL('http://a.com/b/cd', './a:b'); // => http://a.com/b/a:b
```
By default the paths will not be normalized unless necessary, according to the spec. However you can ensure paths are always normalized by setting the `opts.alwaysNormalize` option to `true`.
```javascript
URLToolkit.buildAbsoluteURL('http://a.com/b/cd', '/e/f/../g'); // => http://a.com/e/f/../g
URLToolkit.buildAbsoluteURL('http://a.com/b/cd', '/e/f/../g', { alwaysNormalize: true }); // => http://a.com/e/g
```
### `normalizePath(url)`
Normalizes a path.
```javascript
URLToolkit.normalizePath('a/b/../c'); // => a/c
```
### `parseURL(url)`
Parse a URL into its separate components.
```javascript
URLToolkit.parseURL('http://a/b/c/d;p?q#f'); // =>
/* {
scheme: 'http:',
netLoc: '//a',
path: '/b/c/d',
params: ';p',
query: '?q',
fragment: '#f'
} */
```
### `buildURLFromParts(parts)`
Puts all the parts from `parseURL()` back together into a string.
## Example
```javascript
var URLToolkit = require('url-toolkit');
var url = URLToolkit.buildAbsoluteURL('https://a.com/b/cd/e.m3u8?test=1#something', '../z.ts?abc=1#test');
console.log(url); // 'https://a.com/b/z.ts?abc=1#test'
```
## Browser
This can also be used in the browser thanks to [jsDelivr](https://github.com/jsdelivr/jsdelivr):
```html
```