diff --git a/__tests__/object/index.test.ts b/__tests__/object/index.test.ts
index f74bcd4..e4dbf29 100644
--- a/__tests__/object/index.test.ts
+++ b/__tests__/object/index.test.ts
@@ -1,4 +1,4 @@
-import { isObject, objToStr, isObjEqual, hasOwnProperty, compareJsonDiff } from '../../src/object'
+import { isObject, objToStr, isObjEqual, hasOwnProperty, compareJsonDiff, mergeObjectChanges } from '../../src/object'
 
 const objectA = {
   name: 'adapcon',
@@ -124,3 +124,245 @@ describe('isObjEqual', () => {
     expect(isObjEqual(null, null)).toEqual(true)
   })
 })
+
+describe('Merge Objects Changes tests', () => {
+  describe('Merge Objects Changes tests without custom params', () => {
+    it('should merge two objects', () => {
+      const obj1 = { a: 1, b: 2 }
+      const obj2 = { a: 1, b: 4 }
+      const result = mergeObjectChanges(obj1, obj2)
+      expect(result).toStrictEqual({ a: 1, b: 4 })
+    })
+
+    it('should merge two objects with nested objects', () => {
+      const obj1 = { a: 1, b: { c: 2, d: 3 } }
+      const obj2 = { a: 1, b: { c: 4, d: 3 } }
+      const result = mergeObjectChanges(obj1, obj2)
+      expect(result).toStrictEqual({ a: 1, b: { c: 4, d: 3 } })
+    })
+
+    it('should merge two objects with nested objects on old and undefined on new', <T>() => {
+      const obj1 = { a: 1, b: { c: 2, d: 3 } } as T
+      const obj2 = { a: 1, b: undefined } as T
+      const result = mergeObjectChanges(obj1, obj2)
+      expect(result).toStrictEqual({ a: 1 })
+    })
+
+    it('should merge two objects with nested objects and arrays', () => {
+      const obj1 = { a: 1, b: { c: 2, d: [1, 2] } }
+      const obj2 = { a: 1, b: { c: 4, d: [1, 3] } }
+      const result = mergeObjectChanges(obj1, obj2)
+      expect(result).toStrictEqual({ a: 1, b: { c: 4, d: [1, 3] } })
+    })
+
+    it('should merge two objects with undefined values with not present on new object without options param', () => {
+      const obj1 = { a: 1, b: 2 }
+      const obj2 = { a: 1 }
+      const result = mergeObjectChanges(obj1, obj2)
+      expect(result).toStrictEqual({ a: 1 })
+    })
+  })
+
+  describe('Merge Objects Changes tests without custom params', () => {
+    it('should merge two objects with same type but diff keys and same values on keys that are in both', <T>() => {
+      const obj1 = { a: 1, b: 2 } as T
+      const obj2 = { a: 1, c: 3 } as T
+      const result = mergeObjectChanges(obj1, obj2, {
+        useOldKeysIfNotPresentInNew: true
+      })
+      expect(result).toStrictEqual({ a: 1, b: 2, c: 3 })
+    })
+
+    it('should merge two objects with same type but diff keys and diff values on keys that are in both', <T>() => {
+      const obj1 = { a: 1, b: 2 } as T
+      const obj2 = { a: 2, c: 3 } as T
+      const result = mergeObjectChanges(obj1, obj2, {
+        useOldKeysIfNotPresentInNew: true
+      })
+      expect(result).toStrictEqual({ a: 2, b: 2, c: 3 })
+    })
+  })
+
+  describe('Merge Objects Changes tests with useOldKeysIfNotPresentInNew custom params', () => {
+    it('should merge two objects with new values if key is present on newObj and not on oldObj with useOldKeysIfNotPresentInNew param as true', () => {
+      const obj1 = { a: 1, b: 2 }
+      const obj2 = { a: 2 }
+      const result = mergeObjectChanges(obj1, obj2, {
+        useOldKeysIfNotPresentInNew: true
+      })
+      expect(result).toStrictEqual({ a: 2, b: 2 })
+    })
+
+    it('should merge two objects with new values if key is present on newObj and not on oldObj - useOldKeysIfNotPresentInNew set as false', () => {
+      const obj1 = { a: 1 }
+      const obj2 = { a: 2, b: 2 }
+      const result = mergeObjectChanges(obj1, obj2, {
+        useOldKeysIfNotPresentInNew: false
+      })
+      expect(result).toStrictEqual({ a: 2, b: 2 })
+    })
+
+    it('should merge two objects with undefined values with not present on new object - useOldKeysIfNotPresentInNew param not set', () => {
+      const obj1 = { a: 1, b: 2 }
+      const obj2 = { a: 2 }
+      const result = mergeObjectChanges(obj1, obj2)
+      expect(result).toStrictEqual({ a: 2 })
+    })
+
+    it('should merge two objects with nested objects on old and undefined on new', <T>() => {
+      const obj1 = { a: 1, b: { c: 2, d: 3 } } as T
+      const obj2 = { a: 1, b: undefined } as T
+      const result = mergeObjectChanges(obj1, obj2, {
+        useOldKeysIfNotPresentInNew: true
+      })
+      expect(result).toStrictEqual({ a: 1, b: { c: 2, d: 3 } })
+    })
+  })
+
+  describe('Merge Objects Changes tests with addNewKeys param', () => {
+    it('should add new values with addNewKeys as true', () => {
+      const obj1 = { a: 1 }
+      const obj2 = { a: 1, b: 2 }
+      const result = mergeObjectChanges(obj1, obj2, {
+        addNewKeys: true
+      })
+      expect(result).toStrictEqual({ a: 1, b: 2 })
+    })
+
+    it('should not merge new values with addNewKeys params as false', () => {
+      const obj1 = { a: 1 }
+      const obj2 = { a: 1, b: 2 }
+      const result = mergeObjectChanges(obj1, obj2, {
+        addNewKeys: false
+      })
+      expect(result).toStrictEqual({ a: 1 })
+    })
+
+    it('should add new values when addNewKeys is not set (default value is true)', () => {
+      const obj1 = { a: 1 }
+      const obj2 = { a: 1, b: 2 }
+      const result = mergeObjectChanges(obj1, obj2)
+      expect(result).toStrictEqual({ a: 1, b: 2 })
+    })
+
+    it('should merge two objects with nested objects on old and undefined on new', <T>() => {
+      const obj1 = { a: 1, b: undefined } as T
+      const obj2 = { a: 1, b: { c: 2, d: 3 } } as T
+      const result = mergeObjectChanges(obj1, obj2, {
+        addNewKeys: true
+      })
+      expect(result).toStrictEqual({ a: 1, b: { c: 2, d: 3 } })
+    })
+
+    it('should merge two objects with nested objects on old and undefined on new', <T>() => {
+      const obj1 = { a: 1, b: undefined } as T
+      const obj2 = { a: 1, b: { c: 2, d: 3 } } as T
+      const result = mergeObjectChanges(obj1, obj2, {
+        addNewKeys: false
+      })
+      expect(result).toStrictEqual({ a: 1 })
+    })
+  })
+
+  describe('Merge Objects Changes tests with both useOldKeysIfNotPresentInNew and addNewKeys params', () => {
+    it('should merge two objects with new values if key is present on newObj and not on oldObj with useOldKeysIfNotPresentInNew param as true and addNewKeys as true', () => {
+      const obj1 = { a: 1, b: 2 }
+      const obj2 = { a: 2 }
+      const result = mergeObjectChanges(obj1, obj2, {
+        useOldKeysIfNotPresentInNew: true,
+        addNewKeys: true
+      })
+      expect(result).toStrictEqual({ a: 2, b: 2 })
+    })
+  })
+
+  it('should merge two objects with new values if key is present on newObj and not on oldObj with useOldKeysIfNotPresentInNew param as true and addNewKeys as false', () => {
+    const obj1 = { a: 1, b: 2 }
+    const obj2 = { a: 2 }
+    const result = mergeObjectChanges(obj1, obj2, {
+      useOldKeysIfNotPresentInNew: true,
+      addNewKeys: false
+    })
+    expect(result).toStrictEqual({ a: 2, b: 2 })
+  })
+
+  it('should merge two objects with new values if key is present on newObj and not on oldObj with useOldKeysIfNotPresentInNew param as false and addNewKeys as true', () => {
+    const obj1 = { a: 'um' }
+    const obj2 = { a: 'dois', b: 2 }
+    const result = mergeObjectChanges(obj1, obj2, {
+      useOldKeysIfNotPresentInNew: false,
+      addNewKeys: true
+    })
+    expect(result).toStrictEqual({ a: 'dois', b: 2 })
+  })
+
+  it('should merge two objects with new values if key is present on newObj and not on oldObj with useOldKeysIfNotPresentInNew param as false and addNewKeys as false', () => {
+    const obj1 = { a: 1 }
+    const obj2 = { a: 1, b: 2 }
+    const result = mergeObjectChanges(obj1, obj2, {
+      useOldKeysIfNotPresentInNew: false,
+      addNewKeys: false
+    })
+    expect(result).toStrictEqual({ a: 1 })
+  })
+
+  it('should merge objects with keys present singly in new and old but not in both with useOldKeysIfNotPresentInNew and addNewKeys params ', <T>() => {
+    const obj1 = { a: 1, b: 2 } as T
+    const obj2 = { a: 1, c: 2 } as T
+    const result = mergeObjectChanges(obj1, obj2, {
+      useOldKeysIfNotPresentInNew: true,
+      addNewKeys: true
+    })
+    expect(result).toStrictEqual({ a: 1, b: 2, c: 2 })
+  })
+
+  it('should merge two objects with nested objects on old and undefined on new', <T>() => {
+    const obj1 = { a: 1, b: { c: 2, d: 3 } } as T
+    const obj2 = { a: 1, b: undefined, e: 4 } as T
+    const result = mergeObjectChanges(obj1, obj2, {
+      useOldKeysIfNotPresentInNew: true,
+      addNewKeys: true
+    })
+    expect(result).toStrictEqual({ a: 1, b: { c: 2, d: 3 }, e: 4 })
+  })
+
+  it('should merge two objects with nested objects on old and undefined on new', <T>() => {
+    const obj1 = { a: 1, b: { c: 2, d: 3 } } as T
+    const obj2 = { a: 1, b: undefined } as T
+    const result = mergeObjectChanges(obj1, obj2, {
+      useOldKeysIfNotPresentInNew: true,
+      addNewKeys: false
+    })
+    expect(result).toStrictEqual({ a: 1, b: { c: 2, d: 3 } })
+  })
+
+  it('should merge two objects with nested objects on old and undefined on new', <T>() => {
+    const obj1 = { a: 1, b: { c: 2, d: 3 } } as T
+    const obj2 = { a: 1, b: undefined, e: 5 } as T
+    const result = mergeObjectChanges(obj1, obj2, {
+      useOldKeysIfNotPresentInNew: false,
+      addNewKeys: true
+    })
+    expect(result).toStrictEqual({ a: 1, e: 5 })
+  })
+
+  it('should merge two objects with nested objects on old and undefined on new', <T>() => {
+    const obj1 = { a: 1, b: { c: 2, d: 3 } } as T
+    const obj2 = { a: 1, b: undefined, e: 4 } as T
+    const result = mergeObjectChanges(obj1, obj2, {
+      useOldKeysIfNotPresentInNew: false,
+      addNewKeys: false
+    })
+    expect(result).toStrictEqual({ a: 1 })
+  })
+
+  it('should merge two objects with nested objects on old and undefined on new', <T>() => {
+    const obj1 = { a: 1, b: { c: 2, d: 3 } } as T
+    const obj2 = { a: 1, b: undefined, e: 4 } as T
+    const result = mergeObjectChanges(obj1, obj2, {
+      useOldKeysIfNotPresentInNew: false,
+      addNewKeys: true
+    })
+    expect(result).toStrictEqual({ a: 1, e: 4 })
+  })
+})
diff --git a/src/object/index.ts b/src/object/index.ts
index 9f52ea5..d7a0b4e 100644
--- a/src/object/index.ts
+++ b/src/object/index.ts
@@ -46,3 +46,65 @@ export const compareJsonDiff = ({ baseObject, compareObject }: { baseObject: obj
 
   return { diff, removed }
 }
+
+type MergeObjectChangesOptions = {
+  useOldKeysIfNotPresentInNew?: boolean
+  addNewKeys?: boolean
+}
+export function mergeObjectChanges<T> (
+  oldObj: T,
+  newObj: T,
+  options: MergeObjectChangesOptions = {
+    useOldKeysIfNotPresentInNew: false,
+    addNewKeys: true
+  }
+): T {
+  options.useOldKeysIfNotPresentInNew = options.useOldKeysIfNotPresentInNew ?? false
+  options.addNewKeys = options.addNewKeys ?? true
+
+  const result = {} as T
+
+  function checkKeys (obj: T) {
+    for (const key in obj) {
+      if (Array.isArray(oldObj[key]) && Array.isArray(newObj[key])) {
+        result[key] = newObj[key]
+      } else if (typeof oldObj[key] === 'object' && typeof newObj[key] === 'object') {
+        result[key] = mergeObjectChanges(oldObj[key], newObj[key])
+        continue
+      }
+
+      if (
+        // has key with value on old but not on new
+        (newObj[key] === undefined || newObj[key] === null) &&
+        (oldObj[key] !== undefined && oldObj[key] !== null) &&
+        options.useOldKeysIfNotPresentInNew
+      ) {
+        result[key] = oldObj[key]
+        continue
+      } else if (
+        // has key with value on new but not on old
+        (newObj[key] !== undefined && newObj[key] !== null) &&
+        (oldObj[key] === undefined || oldObj[key] === null) &&
+          options.addNewKeys
+      ) {
+        result[key] = newObj[key]
+        continue
+      } else if (
+        // has key with value on both
+        (newObj[key] !== undefined && newObj[key] !== null) &&
+        (oldObj[key] !== undefined && oldObj[key] !== null)
+      ) {
+        if (oldObj[key] !== newObj[key]) {
+          result[key] = newObj[key]
+        } else {
+          result[key] = oldObj[key]
+        }
+      }
+    }
+  }
+
+  checkKeys(oldObj)
+  checkKeys(newObj)
+
+  return result
+}
diff --git a/src/string/encrypt.ts b/src/string/encrypt.ts
index 0474392..892a729 100644
--- a/src/string/encrypt.ts
+++ b/src/string/encrypt.ts
@@ -1,7 +1,7 @@
 import crypto from 'crypto'
 import { InternalError } from '..'
 
-export function encryptPassword(passwordToEncrypt: string, encryptionKey: string): string {
+export function encryptPassword (passwordToEncrypt: string, encryptionKey: string): string {
   const salt = crypto.randomBytes(16).toString('hex')
   const key = crypto.scryptSync(encryptionKey, salt, 24)
   const iv = Buffer.alloc(16, 0)
@@ -11,7 +11,7 @@ export function encryptPassword(passwordToEncrypt: string, encryptionKey: string
   return `${salt}:${encryptedPassword}`
 }
 
-export function decryptPassword(storedPassword: string, encryptionKey: string): string {
+export function decryptPassword (storedPassword: string, encryptionKey: string): string {
   try {
     const [salt, encryptedPassword] = storedPassword.split(':')
     const key = crypto.scryptSync(encryptionKey, salt, 24)