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snippets/js/s/lowerize.md

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+---
+title: Lowercase object keys
+type: snippet
+language: javascript
+tags: [object]
+author: chalarangelo
+cover: building-facade
+dateModified: 2023-02-12T05:00:00-04:00
+---
+
+Converts all the keys of an object to lower case.
+
+- Use `Object.keys()` to get an array of the object's keys.
+- Use `Array.prototype.reduce()` to map the array to an object, using `String.prototype.toLowerCase()` to lowercase the keys.
+
+```js
+const lowerize = obj =>
+  Object.keys(obj).reduce((acc, k) => {
+    acc[k.toLowerCase()] = obj[k];
+    return acc;
+  }, {});
+```
+
+```js
+lowerize({ Name: 'John', Age: 22 }); // { name: 'John', age: 22 }
+```