What are the valid characters/values allowed as "keys" in javascript object?

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65892079/what-are-the-valid-characters-values-allowed-as-keys-in-javascript-object

Answer 1

Any string is allowed as an object key. From the spec:

Properties are identified using key values. A property key value is either an ECMAScript String value or a Symbol value. All String and Symbol values, including the empty String, are valid as property keys. A property name is a property key that is a String value.