How to fix StrictModeError: Field is not in schema and strict mode is set to throw in MongoDB

const userSchema = new mongoose.Schema({
  name: String,
  email: String,
  phone: String // Add the missing field
});

const userSchema = new mongoose.Schema({
  firstName: String,
  lastName: String
});

// Add a virtual field
userSchema.virtual("fullName").get(function() {
  return `${this.firstName} ${this.lastName}`;
});

// When retrieving, exclude virtuals
const user = await User.findById(id).lean();
// Or convert to plain object and remove virtuals before saving
const plainUser = user.toObject({ virtuals: false });
await user.save();

const userSchema = new mongoose.Schema(
  {
    name: String,
    email: String
  },
  { strict: false } // Allow undefined fields
);

// Allow extra fields in this update
await User.updateOne(
  { _id: userId },
  { $set: updateData },
  { strict: false }
);

// Or when creating a document
const user = new User({ name: "John", ...extraFields });
await user.save({ validateBeforeSave: true }); // strict still applies

// For bulk operations
await User.collection.insertMany(documentsWithExtraFields, { ordered: false });

const childSchema = new mongoose.Schema({
  value: String
}, { strict: false });

const parentSchema = new mongoose.Schema({
  child: childSchema
}, { 
  strict: "throw",
  useNestedStrict: true // Use child schema strict setting
});

const userSchema = new mongoose.Schema({
  name: String,
  email: String
});

const schemaFields = Object.keys(userSchema.paths);
const externalData = { name: "John", email: "[email protected]", extra: "field" };

// Filter to only schema fields
const filteredData = Object.fromEntries(
  Object.entries(externalData).filter(([key]) => schemaFields.includes(key))
);

const user = new User(filteredData);
await user.save();