diff --git a/String/CheckWordOccurrence.js b/String/CheckWordOccurrence.js
new file mode 100644
index 000000000..b86150c0b
--- /dev/null
+++ b/String/CheckWordOccurrence.js
@@ -0,0 +1,25 @@
+/**
+  * Check and count occurrence of each word in a string
+  * Inputs a String eg. Madonna and Boolean
+  **/
+
+const checkWordOccurrence = (str, isCaseSensitive = false) => {
+  if (typeof str !== 'string') {
+    throw new TypeError('The first param should be a string')
+  }
+  if (typeof isCaseSensitive !== 'boolean') {
+    throw new TypeError('The second param should be a boolean')
+  }
+
+  const result = {}
+  if (str.length > 0) {
+    for (let i = 0; i < str.length; i++) {
+      const word = isCaseSensitive ? str[i] : str[i].toUpperCase()
+      if (/\s/.test(word)) continue
+      result[word] = (!result[word]) ? 1 : result[word] + 1
+    }
+  }
+
+  return result
+}
+export { checkWordOccurrence }
diff --git a/String/CheckWordOcurrence.test.js b/String/CheckWordOcurrence.test.js
new file mode 100644
index 000000000..2b1a88782
--- /dev/null
+++ b/String/CheckWordOcurrence.test.js
@@ -0,0 +1,33 @@
+import { checkWordOccurrence } from './CheckWordOccurrence'
+describe('checkWordOccurrence', () => {
+  it('expects throw on insert wrong string', () => {
+    const value = 123
+    expect(() => checkWordOccurrence(value)).toThrow()
+  })
+  it('expect throw on insert wrong param for case sensitive', () => {
+    const value = 'hello'
+    expect(() => checkWordOccurrence(value, value)).toThrow()
+  })
+  it('check occurrence with case sensitive', () => {
+    const stringToTest = 'A Mad World'
+    const charsOccurrences = checkWordOccurrence(stringToTest, true)
+    const expectResult = { A: 1, M: 1, a: 1, d: 2, W: 1, l: 1, o: 1, r: 1 }
+    const occurrencesObjectKeys = Object.keys(charsOccurrences)
+    const expectObjectKeys = Object.keys(expectResult)
+    expect(occurrencesObjectKeys.length).toBe(expectObjectKeys.length)
+    expectObjectKeys.forEach(key => {
+      expect(expectResult[key]).toBe(charsOccurrences[key])
+    })
+  })
+  it('check occurrence with case insensitive', () => {
+    const stringToTest = 'A Mad World'
+    const charsOccurrences = checkWordOccurrence(stringToTest, false)
+    const expectResult = { A: 2, D: 2, L: 1, M: 1, O: 1, R: 1, W: 1 }
+    const occurrencesObjectKeys = Object.keys(charsOccurrences)
+    const expectObjectKeys = Object.keys(expectResult)
+    expect(occurrencesObjectKeys.length).toBe(expectObjectKeys.length)
+    expectObjectKeys.forEach(key => {
+      expect(expectResult[key]).toBe(charsOccurrences[key])
+    })
+  })
+})
diff --git a/package-lock.json b/package-lock.json
index 9bcf2855d..20ddcf663 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3734,12 +3734,11 @@
       },
       "dependencies": {
         "ansi-styles": {
-          "version": "4.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
-          "integrity": "sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==",
+          "version": "4.3.0",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
           "dev": true,
           "requires": {
-            "@types/color-name": "^1.1.1",
             "color-convert": "^2.0.1"
           }
         },
diff --git a/package.json b/package.json
index eea349d1b..450a58349 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,9 @@
     "node-fetch": "2.6.1"
   },
   "standard": {
-    "env": [ "jest" ]
+    "env": [
+      "jest"
+    ]
   },
   "devDependencies": {
     "babel-jest": "^26.3.0",