Mongoose schema optional fields
All fields in a mongoose schema are optional by default (besides _id, of course).
A field is only required if you add required: true to its definition.
So define your schema as the superset of all possible fields, adding required: true to the fields that are required.
In addition to optional (default) and required, a field can also be conditionally required, based on one or more of the other fields.
For example, require password only if email exists:
var userschema = mongoose.Schema({ org: String, username: String, fullname: String, password: { type: String, required: function(){ return this.email? true : false } }, email: String});