diff --git a/src/http.ts b/src/http.ts
index b9a003d..654de43 100644
--- a/src/http.ts
+++ b/src/http.ts
@@ -5,7 +5,7 @@ import {
   parseAcceptLanguage,
   pathLanguageParser,
   toLocale,
-  validateLanguageTag,
+  validateLangTag,
 } from './shared.ts'
 import { ACCEPT_LANGUAGE_HEADER } from './constants.ts'
 
@@ -145,7 +145,7 @@ export function getLocaleWithGetter(getter: () => string): Intl.Locale {
 export function validateLocale(locale: string | Intl.Locale): void {
   if (
     !(isLocale(locale) ||
-      typeof locale === 'string' && validateLanguageTag(locale))
+      typeof locale === 'string' && validateLangTag(locale))
   ) {
     throw new SyntaxError(`locale is invalid: ${locale.toString()}`)
   }
diff --git a/src/index.ts b/src/index.ts
index f7a8bf5..09982a3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,7 +4,7 @@ export {
   normalizeLanguageName,
   parseAcceptLanguage,
   registerPathLanguageParser,
-  validateLanguageTag,
+  validateLangTag,
 } from './shared.ts'
 export {
   getPathLanguage,
diff --git a/src/shared.test.ts b/src/shared.test.ts
index e319e5f..5f24e44 100644
--- a/src/shared.test.ts
+++ b/src/shared.test.ts
@@ -6,7 +6,7 @@ import {
   parseAcceptLanguage,
   pathLanguageParser,
   toLocale,
-  validateLanguageTag,
+  validateLangTag,
 } from './shared.ts'
 
 describe('isLocale', () => {
@@ -65,13 +65,13 @@ describe('parseAcceptLanguage', () => {
   })
 })
 
-describe('validateLanguageTag', () => {
+describe('validateLangTag', () => {
   test('valid', () => {
-    expect(validateLanguageTag('en-US')).toBe(true)
+    expect(validateLangTag('en-US')).toBe(true)
   })
 
   test('invalid', () => {
-    expect(validateLanguageTag('j')).toBe(false)
+    expect(validateLangTag('j')).toBe(false)
   })
 })
 
diff --git a/src/shared.ts b/src/shared.ts
index 219b1d3..70bf362 100644
--- a/src/shared.ts
+++ b/src/shared.ts
@@ -33,19 +33,6 @@ export function toLocale(val: string | Intl.Locale): Intl.Locale {
   return isLocale(val) ? val : new Intl.Locale(val)
 }
 
-/**
- * parse `accept-language` header string
- *
- * @param {string} value The accept-language header string
- *
- * @returns {Array<string>} The array of language tags, if `*` (any language) or empty string is detected, return an empty array.
- */
-export function parseAcceptLanguage(value: string): string[] {
-  return value.split(',').map((tag) => tag.split(';')[0]).filter((tag) =>
-    !(tag === '*' || tag === '')
-  )
-}
-
 /**
  * validate the language tag whether is a well-formed {@link https://datatracker.ietf.org/doc/html/rfc4646#section-2.1 | BCP 47 language tag}.
  *
@@ -53,7 +40,7 @@ export function parseAcceptLanguage(value: string): string[] {
  *
  * @returns {boolean} Returns `true` if the language tag is valid, else `false`.
  */
-export function validateLanguageTag(lang: string): boolean {
+export function validateLangTag(lang: string): boolean {
   try {
     // TODO: if we have a better way to validate the language tag, we should use it.
     new Intl.Locale(lang)
@@ -63,6 +50,19 @@ export function validateLanguageTag(lang: string): boolean {
   }
 }
 
+/**
+ * parse `accept-language` header string
+ *
+ * @param {string} value The accept-language header string
+ *
+ * @returns {Array<string>} The array of language tags, if `*` (any language) or empty string is detected, return an empty array.
+ */
+export function parseAcceptLanguage(value: string): string[] {
+  return value.split(',').map((tag) => tag.split(';')[0]).filter((tag) =>
+    !(tag === '*' || tag === '')
+  )
+}
+
 /**
  * nomralize the language name
  *