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snippets/js/s/url-join.md

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+---
+title: Join URL segments
+type: snippet
+language: javascript
+tags: [string,regexp]
+cover: digital-nomad-2
+dateModified: 2020-10-22T20:24:44+03:00
+---
+
+Joins all given URL segments together, then normalizes the resulting URL.
+
+- Use `Array.prototype.join()` to combine URL segments.
+- 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).
+
+```js
+const URLJoin = (...args) =>
+  args
+    .join('/')
+    .replace(/[\/]+/g, '/')
+    .replace(/^(.+):\//, '$1://')
+    .replace(/^file:/, 'file:/')
+    .replace(/\/(\?|&|#[^!])/g, '$1')
+    .replace(/\?/g, '&')
+    .replace('&', '?');
+```
+
+```js
+URLJoin('http://www.google.com', 'a', '/b/cd', '?foo=123', '?bar=foo');
+// 'http://www.google.com/a/b/cd?foo=123&bar=foo'
+```