When you want to get and set value for keys on objects without causing JSHint camel case errors.
If you also keep getting errors like this:
object.someField = json.some_json_key;
file.js: line 56, col 0, Identifier 'some_json_key' is not in camel case.
Then this module is for you!
object.someField = valueForKey(json, 'some_json_key');
npm install value-for-key