Since Mongoose 4.2.0, the validateBeforeSave option has been added to skip validation when using model.save().

• 4.2.0 / 2015-10-22 | mongoose/History.md at master · Automattic/mongoose
• Option to disable validation at the save level · Issue #2981 · Automattic/mongoose

validateBeforeSave Test Code test/document.test.js#L462-L473

For sample code using the validateBeforeSave option, mongoose’s test code seemed intuitively understandable.

it('allows you to skip validation on save (gh-2981)', function(done) {
  var db = start();

  var MyModel = db.model('gh2981',
      {name: {type: String, required: true}});

  var doc = new MyModel();
  doc.save({validateBeforeSave: false}, function(error) {
    assert.ifError(error);
    db.close(done);
  });
});

Since this is only available from Mongoose 4.2.0, I recommend updating quickly if you’re using an older version.

Reference Information

• Model#save([options], [options.safe], [options.validateBeforeSave], [fn]) | Mongoose API
• Mongoose Schemas

That’s all from the Gemba.