Static schema property

[Paul Verhoeven]

I've got incoming JSON something like:

{ "foo": "bar", "other": 1, "another": "A" }

Now i know for a fact that "foo" always need to be "bar". I found two solutions for making that happen in my schema: Using an enum or writing a validator which both seem overkill for something like sting comparison. I was hoping i could do something simple like:

{ "foo": "bar", "other": Number, "another": String }

or something like this:

{ "foo": { type: String, value: "bar" }, "other": Number, "another": String }

Can't seem to find something like that so i was wondering if i am correct in my findings and not overseeing something so that i can continue and to choose between using an enum or a validator.