		@@ -123,22 +123,14 @@ <p align="center"><img src="https://raw.githubusercontent.com/herbsjs/gotu/master/docs/logo.png" height="220"></p>

		By default `fromJSON` allows serialize only keys that have been defined in the entity. If you want to add other keys during serialization, use `allowExtraKeys: true`.
		By default `fromJSON` serializes only keys that have been defined in the entity. If you want to add other keys during serialization, use `.fromJSON(data, { allowExtraKeys: true })`.

		```javascript
		const User =
		entity('User', {
		name: field(String)
		})

		const user = User.fromJSON({ name: 'Beth', newKey: 'value'}, { allowExtraKeys: true })
		// user = { name: 'Beth', newKey: 'value'}
		```

		### `JSON.stringify(entity)`

		To serialize an entity to JSON string use `JSON.stringify` function.
		To serialize an entity to JSON string use `JSON.stringify` or `entity.toJSON` function.

		```javascript
		const json = JSON.stringify(user) // { "name": "Beth"}
		const json = JSON.stringify(user) // { "name": "Beth" }
		```

		By default `toJSON` serializes only keys that have been defined in the entity. If you want to add other keys during serialization, use `entity.toJSON({ allowExtraKeys: true })`.

		## Field definition
		@@ -145,0 +137,0 @@

src/baseEntity.js

		@@ -51,6 +51,11 @@ const { validate, checker } = require("suma")

		toJSON() {
		toJSON(options = { allowExtraKeys: false }) {
		function deepCopy(obj) {
		const copy = {}
		for (const field in obj.meta.schema) {

		const jsonKeys = options.allowExtraKeys ? Object.keys(obj) : []
		const entityKeys = Object.keys(obj.meta.schema)
		const mergedKeys = jsonKeys.concat(entityKeys.filter((item) => jsonKeys.indexOf(item) < 0))

		for (const field of mergedKeys) {
		let value = obj[field]
		@@ -93,10 +98,9 @@ if (value instanceof BaseEntity) value = deepCopy(value)

		const jsonKeys = Object.keys(data)
		const jsonKeys = options.allowExtraKeys ? Object.keys(data) : []
		const entityKeys = Object.keys(instance.meta.schema)
		const keys = jsonKeys.concat(entityKeys.filter((item) => jsonKeys.indexOf(item) < 0))
		const mergedKeys = jsonKeys.concat(entityKeys.filter((item) => jsonKeys.indexOf(item) < 0))

		for (const key of keys) {
		for (const key of mergedKeys) {
		const field = instance.meta.schema[key]
		if (field === undefined) {
		if (!options.allowExtraKeys) continue
		instance[key] = data[key]
		@@ -103,0 +107,0 @@ continue

test/entity/serializationEntity.js

		@@ -158,3 +158,2 @@ const { entity } = require('../../src/entity')
		const AnEntity = givenAnEntityToReceiveObject()
		const options = { allowExtraKeys: true }

		@@ -179,3 +178,5 @@ //when
		method2() { return "Niente" }
		}, options)
		},
		{ allowExtraKeys: true })

		//then
		@@ -247,2 +248,28 @@ assert.strictEqual(instance['field1'], 1)

		it('should allow extra fields from JSON', () => {
		//given
		const AnEntity = givenAnEntityToBuildAJSON()
		const instance = new AnEntity()
		instance.field1 = 1
		instance.field2 = "1"
		instance.field3 = new Date('2019-09-30T23:45:34.324Z')
		instance.field4 = true
		instance.field5.f1 = true
		instance.field5.f2 = "2"
		instance.field6.push({ f1: true, f2: "2" })
		instance.field1x = 1
		instance.field2x = "1"
		instance.field3x = new Date('2019-09-30T23:45:34.324Z')
		instance.field4x = true
		instance.field5x = { f1: true, f2: "2" }
		instance.field6x = [{ f1: true, f2: "2" }]

		//when
		instance.validate()
		const json = JSON.stringify(instance.toJSON({ allowExtraKeys: true }))

		//then
		assert.deepStrictEqual(json, '{"field1":1,"field2":"1","field3":"2019-09-30T23:45:34.324Z","field4":true,"field1x":1,"field2x":"1","field3x":"2019-09-30T23:45:34.324Z","field4x":true,"field5x":{"f1":true,"f2":"2"},"field6x":[{"f1":true,"f2":"2"}],"field5":{"f1":true,"f2":"2"},"field6":[{"f1":true,"f2":"2"}]}')
		})

		it('invalid data to JSON', () => {
		@@ -249,0 +276,0 @@ //given

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