# lowercaseKeys
> Convert each object key to lowercase.
## Usage
```javascript
var lowercaseKeys = require( '@stdlib/utils/lowercase-keys' );
```
#### lowercaseKeys( obj )
Converts each `object` key to lowercase, mapping the transformed keys to a new `object` having the same values.
```javascript
var obj1 = {
'A': 1,
'B': 2
};
var obj2 = lowercaseKeys( obj1 );
// returns { 'a': 1, 'b': 2 }
```
## Notes
- The function only transforms **own** properties. Hence, the function does **not** transform inherited properties.
- The function **shallow** copies key values.
## Examples
```javascript
var lowercaseKeys = require( '@stdlib/utils/lowercase-keys' );
var obj1 = {
'A': 'beep',
'B': 'boop',
'C': 'foo',
'D': 'bar'
};
var obj2 = lowercaseKeys( obj1 );
console.dir( obj2 );
// => { 'a': 'beep', 'b': 'boop', 'c': 'foo', 'd': 'bar' }
```