Using POST in terminal for MongoDB returns ObjectParameterError - mongodb

Question

I just started learning about MongoDB and Node.js and was confused about this error. I created this app through the next.js template.
The error I am getting is
error - ObjectParameterError: Parameter "obj" to Document() must be an object, got {"title":"X","content":"XXX"}
Where I tried inserting the data through this line on my terminal
curl -X POST -d '{"title":"X","content":"XXX"}' -H 'Content-Type: application/json' localhost:3000/api/blogs/articles
Here is the code...
import { connect, model, models, Schema } from "mongoose"
const connectionString = 'mongodb+srv://user1:2bhEHe22GdtH1idX#cluster0.t27tcax.mongodb.net/blogs'
export default async function handler(req, res) {
await connect(connectionString);
console.log("req.method: ", req.method)
if (req.method === 'GET') {
const docs = await Article.find()
res.status(200).json(docs)
} else if (req.method === 'POST') {
console.log(req.body)
res.status(200).json(req.body)
// const doc = await Article.create(req.body)
// res.status(201).json(doc)
} else {
res.setHeader('Allow', ['GET', 'POST'])
res.status(405).end(`Method ${req.method} Not Allowed`)
}
}
const articleSchema = new Schema({
title: String,
content: String,
});
console.log("Mongoose Models", models)
const Article = models?.article || model('article', articleSchema);
I've took a look at a similar post (Saving data into MongoDb returns an ObjectParameterError) and it seems that all I've already implemented their fixes. Thank you for any help you can give.