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snippets/js/s/parse-cookie.md

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+---
+title: Parse cookie
+type: snippet
+language: javascript
+tags: [browser,string]
+cover: three-vases
+dateModified: 2020-10-22T20:24:04+03:00
+---
+
+Parses an HTTP Cookie header string, returning an object of all cookie name-value pairs.
+
+- Use `String.prototype.split()` to separate key-value pairs from each other.
+- Use `Array.prototype.map()` and `String.prototype.split()` to separate keys from values in each pair.
+- Use `Array.prototype.reduce()` and `decodeURIComponent()` to create an object with all key-value pairs.
+
+```js
+const parseCookie = str =>
+  str
+    .split(';')
+    .map(v => v.split('='))
+    .reduce((acc, v) => {
+      acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
+      return acc;
+    }, {});
+```
+
+```js
+parseCookie('foo=bar; equation=E%3Dmc%5E2');
+// { foo: 'bar', equation: 'E=mc^2' }
+```