Some of my students have discovered that JSON doesn't support comments --- they're not in the syntax diagram on the json.org home page or the RFC, and various discussion threads bemoan their absence. We'd like to use JSON both for data interchange and for specifying test fixtures; we could live without comments for the former if we had to, but it's a real pain to (for example) have the encrypted version of a password in a test fixture, but not the plaintext password it was derived from. One possibility is to add a "comment" field to every data type that needs commenting (e.g., the dictionary that represents a User object would have "comment" as one of its keys), but then the mapping from JSON to object or database entry is no longer 1-1. How are other people dealing with this?