diff --git a/lib/core/fluent-url.ts b/lib/core/fluent-url.ts
index 3529074..f0fff34 100644
--- a/lib/core/fluent-url.ts
+++ b/lib/core/fluent-url.ts
@@ -13,7 +13,7 @@ import type {
 } from '@/shared/types'
 
 export class FluentUrl {
-  private config: FluentUrlConfig
+  private readonly config: FluentUrlConfig
   private readonly protocol?: string
   private readonly hostname?: string
   private readonly paths: string[]
@@ -76,7 +76,7 @@ export class FluentUrl {
 
   public clone(
     options?: Partial<FLuentUrlPlainObject>,
-    config?: FluentUrlConfig,
+    config?: Partial<FluentUrlConfig>,
   ): FluentUrl {
     return new FluentUrl(
       mergeOptions(
diff --git a/lib/core/serializer/url-serializer.ts b/lib/core/serializer/url-serializer.ts
index 1b93273..cab9bdc 100644
--- a/lib/core/serializer/url-serializer.ts
+++ b/lib/core/serializer/url-serializer.ts
@@ -1,9 +1,74 @@
-import type { UrlSerializer } from '@/shared/types'
+import type { FLuentUrlPlainObject, UrlSerializer } from '@/shared/types'
 
-export const parseUrl: UrlSerializer['parseUrl'] = () => {
-  throw new Error('Not implemented')
+const URLTypesObj = {
+  absolute: 'absolute',
+  relative: 'relative',
+  protocolRelative: 'protocol-relative',
+} as const
+
+type URLTypes = (typeof URLTypesObj)[keyof typeof URLTypesObj]
+
+const defaultProtocol = 'https'
+const defaultHost = 'example.com'
+
+export const parseUrl: UrlSerializer['parseUrl'] = ({ str, parseQuery }) => {
+  const urlString = str.trim()
+
+  const urlType: URLTypes = urlString.startsWith('//')
+    ? URLTypesObj.protocolRelative
+    : urlString.startsWith('/')
+      ? URLTypesObj.relative
+      : URLTypesObj.absolute
+
+  let newUrlString = urlString
+
+  if (urlType === URLTypesObj.protocolRelative) {
+    newUrlString = `${defaultProtocol}:${newUrlString}`
+  }
+
+  if (urlType === URLTypesObj.relative) {
+    newUrlString = `${defaultProtocol}://${defaultHost}${newUrlString}`
+  }
+
+  let url: URL
+
+  try {
+    url = new URL(newUrlString)
+  } catch {
+    throw new Error('Invalid URL')
+  }
+
+  const urlPlainObject: FLuentUrlPlainObject = {
+    paths: [],
+    queries: {},
+  }
+
+  if (urlType === URLTypesObj.absolute) {
+    urlPlainObject.protocol =
+      url.protocol !== '' ? url.protocol.replace(':', '') : undefined
+  }
+
+  if (
+    urlType === URLTypesObj.absolute ||
+    urlType === URLTypesObj.protocolRelative
+  ) {
+    urlPlainObject.hostname = url.hostname || undefined
+  }
+
+  urlPlainObject.paths =
+    url.pathname === '/' ? [] : url.pathname.split('/').filter((p) => p !== '')
+
+  urlPlainObject.port = url.port !== '' ? Number(url.port) : undefined
+
+  urlPlainObject.fragment =
+    url.hash !== '' ? url.hash.replace('#', '') : undefined
+
+  urlPlainObject.queries =
+    url.search !== '' ? parseQuery(url.search) : Object.create(null)
+
+  return urlPlainObject
 }
 
-export const stringifyUrl: UrlSerializer['stringifyUrl'] = () => {
+export const stringifyUrl: UrlSerializer['stringifyUrl'] = (_args) => {
   throw new Error('Not implemented')
 }
diff --git a/lib/shared/types/index.ts b/lib/shared/types/index.ts
index 667d612..fe9488a 100644
--- a/lib/shared/types/index.ts
+++ b/lib/shared/types/index.ts
@@ -17,11 +17,11 @@ export interface QuerySerializer {
 export interface UrlSerializer {
   parseUrl: (args: {
     str: string
-    parseQuery?: QuerySerializer['parseQuery']
+    parseQuery: QuerySerializer['parseQuery']
   }) => FLuentUrlPlainObject
   stringifyUrl: (args: {
     obj: FLuentUrlPlainObject
-    stringifyQuery?: QuerySerializer['stringifyQuery']
+    stringifyQuery: QuerySerializer['stringifyQuery']
   }) => string
 }