Parse.com REST API - Special Characters

Through parse.com REST API i'm signing in user with their Facebook accounts in node.js. I get an error when I try to sign up users that have names such as Martin Sánchez. Are special characters something to be aware of when saving objects in Parse.com through the REST API?

Note: I'm encountering this problem only on the REST API, meaning that it works fine in iOS and Android. I tried encoding the string but it gets saved literally(Martin S\\u00e1nchez as a string).