How to update a object in mongodb via mongoose?

Now you can update directly .

OrganizationModel.update(
 {name: 'Koka'}, 
 {'address.street': 'new street name'}, 
 callback);

I can't find any docs that cover this simple case so I can see why you're having trouble. But it's as simple as using a $set with a key that uses dot notation to reference the embedded field:

OrganizationModel.update(
  {name: 'Koka'}, 
  {$set: {'address.street': 'new street name'}}, 
  callback);

Using Document set also, specified properties can be updated. With this approach, we can use "save" which validates the data also.

  doc.set({
        path  : value
      , path2 : {
           path  : value
        }
    }

Example: Update Product schema using Document set and save.

// Update the product
let productToUpdate = await Product.findById(req.params.id);

if (!productToUpdate) {
  throw new NotFoundError();
}

productToUpdate.set({title:"New Title"});
await productToUpdate.save();

Note - This can be used to update the multiple and nested properties also.