Summary  
This chapter demonstrates using a model method to update existing database records with new data and return the updated document.

General domain of usage  
Web API development


To update existing data in MongoDB, you use methods provided by the model.

A common method is `findByIdAndUpdate`.

```javascript id="x7m2qp"
app.put('/users/:id', async (req, res) => {
  const updatedUser = await User.findByIdAndUpdate(
    req.params.id,
    req.body,
    { new: true }
  );

  res.json(updatedUser);
});
```

The first argument is the id, the second is the new data, and the third option ensures the updated document is returned.

Example:

`PUT '/users/123'`: updates user with id 123.

This allows your API to modify existing records in the database.


Learn how to store and manage data in backend applications using MongoDB and Mongoose. Connect your Express API to a database and perform create, read, update, and delete operations. Build real data-driven backend functionality and move beyond in-memory storage.

Updating Data