Basic Validation with Mongoose

When working with data, it is important to ensure that it has the correct structure.

Mongoose allows you to define simple validation rules in your schema.

const userSchema = new mongoose.Schema({
  name: {
    type: String,
    required: true
  },
  age: {
    type: Number
  }
});

Here, the name field is required. If it is missing, Mongoose will not allow the document to be saved.

app.post('/users', async (req, res) => {
  try {
    const user = new User(req.body);
    const savedUser = await user.save();

    res.json(savedUser);
  } catch (error) {
    res.status(400).send('validation error');
  }
});

Validation helps prevent invalid or incomplete data from being stored in the database.