Validation Error in mongoDB while making a reference to another Schema?

You should change your model name when creating a new Blog document:

  const newBlog = new Blog({
    title: request.body.title,
    url: request.body.url,
    likes: request.body.likes || 0,
    user: currentUser,

Also, a good practice would be to check if there are any users in the database before retrieving the first one. This to avoid possible index out of bounds exceptions:

const userDB = await User.find({});
if (userDB.length > 0) {
    const currentUser = userDB[0]._id;

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