mongodb_validation.json

{
  $jsonSchema: {
    required: ['_id', 'FirstName', 'LastName', 'dob', 'Tests'],
    properties: {
      _id: { bsonType: 'binData' },
      FirstName: { bsonType: 'string' },
      LastName: { bsonType: 'string' },
      dob: { bsonType: 'date' },
      Tests: {
        bsonType: ['array', 'null'],
        required: ['Date'],
        additionalProperties: true
      }
    },
    additionalProperties: false
  }
}