With a Mongoose schema, Is it possible to define the type of an objects property/keys that are unknown?
There is no option for "wild card" schema path validation as far as I know.What you can do is define a strict: false schema and define a pre save and update functions.
The schema would look like this:
var TestSchema = new mongoose.Schema( { }, { strict: false });it means that there are no defined fields and you can enter any field you want. Now you want to validate the document before saving with a pre save function:
TestSchema.pre('save', function (next) { var doc = this.toObject(); for (var prop in doc) { if ('string' !== typeof doc[prop]) { next(new Error('validation error')); } } next();});You would want to do same on pre update function. you can read more about mongoose Middleware here: