31 lines
942 B
Markdown
31 lines
942 B
Markdown
---
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title: Join URL segments
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type: snippet
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language: javascript
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tags: [string,regexp]
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cover: digital-nomad-2
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dateModified: 2020-10-22T20:24:44+03:00
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---
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Joins all given URL segments together, then normalizes the resulting URL.
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- Use `Array.prototype.join()` to combine URL segments.
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- Use a series of `String.prototype.replace()` calls with various regular expressions to normalize the resulting URL (remove double slashes, add proper slashes for protocol, remove slashes before parameters, combine parameters with `'&'` and normalize first parameter delimiter).
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```js
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const URLJoin = (...args) =>
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args
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.join('/')
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.replace(/[\/]+/g, '/')
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.replace(/^(.+):\//, '$1://')
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.replace(/^file:/, 'file:/')
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.replace(/\/(\?|&|#[^!])/g, '$1')
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.replace(/\?/g, '&')
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.replace('&', '?');
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```
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```js
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URLJoin('http://www.google.com', 'a', '/b/cd', '?foo=123', '?bar=foo');
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// 'http://www.google.com/a/b/cd?foo=123&bar=foo'
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```
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