diff --git a/src/client/includes/flatObj.ts b/src/client/includes/flatObj.ts
new file mode 100644
index 0000000..7265394
--- /dev/null
+++ b/src/client/includes/flatObj.ts
@@ -0,0 +1,14 @@
+// could use a reduce, but a simple for-in has less footprint
+export const flatObj = (obj: Record<string, any>, prefix = '') => {
+  const flatted: Record<string, string> = {}
+  for (const key in obj) {
+    const flatKey = prefix + key
+    // we want plain objects and arrays
+    if (typeof obj[key] === 'object') {
+      Object.assign(flatted, flatObj(obj[key], `${flatKey}.`))
+    } else {
+      flatted[flatKey] = obj[key]
+    }
+  }
+  return flatted
+}
diff --git a/src/client/includes/getClientLocale.ts b/src/client/includes/getClientLocale.ts
new file mode 100644
index 0000000..a131e0d
--- /dev/null
+++ b/src/client/includes/getClientLocale.ts
@@ -0,0 +1,59 @@
+import { GetClientLocaleOptions } from '../types'
+
+const getFromQueryString = (queryString: string, key: string) => {
+  const keyVal = queryString.split('&').find(i => i.indexOf(`${key}=`) === 0)
+
+  if (keyVal) {
+    return keyVal.split('=').pop()
+  }
+  return null
+}
+
+const getFirstMatch = (base: string, pattern: RegExp) => {
+  const match = pattern.exec(base)
+  // istanbul ignore if
+  if (!match) return null
+  // istanbul ignore else
+  return match[1] || null
+}
+
+export const getClientLocale = ({
+  navigator,
+  hash,
+  search,
+  pathname,
+  hostname,
+}: GetClientLocaleOptions) => {
+  let locale
+
+  // istanbul ignore next
+  if (typeof window === 'undefined') return null
+
+  if (hostname) {
+    locale = getFirstMatch(window.location.hostname, hostname)
+    if (locale) return locale
+  }
+
+  if (pathname) {
+    locale = getFirstMatch(window.location.pathname, pathname)
+    if (locale) return locale
+  }
+
+  if (navigator) {
+    // istanbul ignore else
+    locale = window.navigator.language || window.navigator.languages[0]
+    if (locale) return locale
+  }
+
+  if (search) {
+    locale = getFromQueryString(window.location.search.substr(1), search)
+    if (locale) return locale
+  }
+
+  if (hash) {
+    locale = getFromQueryString(window.location.hash.substr(1), hash)
+    if (locale) return locale
+  }
+
+  return null
+}
diff --git a/src/runtime/configs.ts b/src/runtime/configs.ts
index d15a0d8..a3603f7 100644
--- a/src/runtime/configs.ts
+++ b/src/runtime/configs.ts
@@ -1,4 +1,4 @@
-import { getClientLocale } from './includes/utils'
+import { getClientLocale } from './includes/getClientLocale'
 import { ConfigureOptions } from './types'
 import { $locale } from './stores/locale'
 
diff --git a/src/runtime/includes/utils.ts b/src/runtime/includes/utils.ts
index 5b70ea6..a131e0d 100644
--- a/src/runtime/includes/utils.ts
+++ b/src/runtime/includes/utils.ts
@@ -1,20 +1,5 @@
 import { GetClientLocaleOptions } from '../types'
 
-// could use a reduce, but a simple for-in has less footprint
-export const flatObj = (obj: Record<string, any>, prefix = '') => {
-  const flatted: Record<string, string> = {}
-  for (const key in obj) {
-    const flatKey = prefix + key
-    // we want plain objects and arrays
-    if (typeof obj[key] === 'object') {
-      Object.assign(flatted, flatObj(obj[key], `${flatKey}.`))
-    } else {
-      flatted[flatKey] = obj[key]
-    }
-  }
-  return flatted
-}
-
 const getFromQueryString = (queryString: string, key: string) => {
   const keyVal = queryString.split('&').find(i => i.indexOf(`${key}=`) === 0)
 
diff --git a/src/runtime/stores/dictionary.ts b/src/runtime/stores/dictionary.ts
index a4c5127..80bd669 100644
--- a/src/runtime/stores/dictionary.ts
+++ b/src/runtime/stores/dictionary.ts
@@ -1,7 +1,7 @@
 import { writable, derived } from 'svelte/store'
 
-import { LocaleDictionary, DeepDictionary, Dictionary } from '../types'
-import { flatObj } from '../includes/utils'
+import { LocaleDictionary, DeepDictionary, Dictionary } from '../types/index'
+import { flatObj } from '../includes/flatObj'
 
 import { getFallbackOf } from './locale'
 
diff --git a/test/runtime/includes/utils.test.ts b/test/runtime/includes/utils.test.ts
index a5b45c2..8adfc1e 100644
--- a/test/runtime/includes/utils.test.ts
+++ b/test/runtime/includes/utils.test.ts
@@ -1,11 +1,5 @@
-import {
-  getClientLocale,
-  capital,
-  title,
-  upper,
-  lower,
-  flatObj,
-} from '../../../src/runtime/includes/utils'
+import { getClientLocale } from '../../../src/client/includes/getClientLocale'
+import { flatObj } from '../../../src/client/includes/flatObj'
 
 describe('getting client locale', () => {
   beforeEach(() => {
@@ -113,24 +107,6 @@ describe('getting client locale', () => {
   })
 })
 
-describe('string utilities', () => {
-  test('transforms a string into capital case', () => {
-    expect(capital('lowercase string')).toMatch('Lowercase string')
-  })
-
-  test('transforms a string into title case', () => {
-    expect(title('lowercase string')).toMatch('Lowercase String')
-  })
-
-  test('transforms a string into uppercase', () => {
-    expect(upper('lowercase string')).toMatch('LOWERCASE STRING')
-  })
-
-  test('transforms a string into lowercase', () => {
-    expect(lower('UPPERCASE STRING')).toMatch('uppercase string')
-  })
-})
-
 describe('deep object handling', () => {
   test('flattens a deep object', () => {
     const obj = {