diff --git a/resources/assets/js/app.ts b/resources/assets/js/app.ts
index 7267f57..1196678 100644
--- a/resources/assets/js/app.ts
+++ b/resources/assets/js/app.ts
@@ -1,5 +1,5 @@
 import * as Cookies from 'js-cookie';
-import jqXHR = JQuery.jqXHR;
+import { fetchPostJson, fetchDeleteJson, ResponseError } from './fetch';
 
 require('./bootstrap');
 
@@ -41,57 +41,46 @@ $(() => {
         const isLiked = $this.data('liked');
 
         if (isLiked) {
-            const callback = (data: any) => {
-                $this.data('liked', false);
-                $this.find('.oi-heart').removeClass('text-danger');
-
-                const count = data.ejaculation ? data.ejaculation.likes_count : 0;
-                $this.find('.like-count').text(count ? count : '');
-            };
-
-            $.ajax({
-                url: '/api/likes/' + encodeURIComponent(targetId),
-                method: 'delete',
-                type: 'json',
-            })
-                .then(callback)
-                .catch(function (xhr: jqXHR) {
-                    if (xhr.status === 404) {
-                        callback(JSON.parse(xhr.responseText));
-                        return;
+            fetchDeleteJson(`/api/likes/${encodeURIComponent(targetId)}`)
+                .then((response) => {
+                    if (response.status === 200 || response.status === 404) {
+                        return response.json();
                     }
+                    throw new ResponseError(response);
+                })
+                .then((data) => {
+                    $this.data('liked', false);
+                    $this.find('.oi-heart').removeClass('text-danger');
 
-                    console.error(xhr);
+                    const count = data.ejaculation ? data.ejaculation.likes_count : 0;
+                    $this.find('.like-count').text(count ? count : '');
+                })
+                .catch((e) => {
+                    console.error(e);
                     alert('いいねを解除できませんでした。');
                 });
         } else {
-            const callback = (data: any) => {
-                $this.data('liked', true);
-                $this.find('.oi-heart').addClass('text-danger');
+            fetchPostJson('/api/likes', { id: targetId })
+                .then((response) => {
+                    if (response.status === 200 || response.status === 409) {
+                        return response.json();
+                    }
+                    throw new ResponseError(response);
+                })
+                .then((data) => {
+                    $this.data('liked', true);
+                    $this.find('.oi-heart').addClass('text-danger');
 
-                const count = data.ejaculation ? data.ejaculation.likes_count : 0;
-                $this.find('.like-count').text(count ? count : '');
-            };
-
-            $.ajax({
-                url: '/api/likes',
-                method: 'post',
-                type: 'json',
-                data: {
-                    id: targetId,
-                },
-            })
-                .then(callback)
-                .catch(function (xhr: jqXHR) {
-                    if (xhr.status === 409) {
-                        callback(JSON.parse(xhr.responseText));
-                        return;
-                    } else if (xhr.status === 401) {
+                    const count = data.ejaculation ? data.ejaculation.likes_count : 0;
+                    $this.find('.like-count').text(count ? count : '');
+                })
+                .catch((e) => {
+                    if (e instanceof ResponseError && e.response.status === 401) {
                         alert('いいねするためにはログインしてください。');
                         return;
                     }
 
-                    console.error(xhr);
+                    console.error(e);
                     alert('いいねできませんでした。');
                 });
         }
diff --git a/resources/assets/js/fetch.ts b/resources/assets/js/fetch.ts
index d683e62..128aec4 100644
--- a/resources/assets/js/fetch.ts
+++ b/resources/assets/js/fetch.ts
@@ -17,41 +17,55 @@ const joinParamsToPath = (path: string, params: QueryParams) =>
 const fetchWrapper = (path: string, options: RequestInit = {}) =>
     fetch(path, {
         credentials: 'same-origin',
-        headers,
+        headers: { ...headers, ...options.headers },
         ...options,
     });
 
-const fetchWithJson = (path: string, body: any, options: RequestInit = {}) =>
+const fetchWithJson = (path: string, body?: any, options: RequestInit = {}) =>
     fetchWrapper(path, {
-        body: JSON.stringify(body),
-        headers: { 'Content-Type': 'application/json' },
+        body: body && JSON.stringify(body),
+        headers: { 'Content-Type': 'application/json', ...options.headers },
         ...options,
     });
 
-const fetchWithForm = (path: string, body: any, options: RequestInit = {}) =>
+const fetchWithForm = (path: string, body?: any, options: RequestInit = {}) =>
     fetchWrapper(path, {
-        body: stringify(body),
-        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+        body: body && stringify(body),
+        headers: { 'Content-Type': 'application/x-www-form-urlencoded', ...options.headers },
         ...options,
     });
 
 export const fetchGet = (path: string, params: QueryParams = {}, options: RequestInit = {}) =>
     fetchWrapper(joinParamsToPath(path, params), { method: 'GET', ...options });
 
-export const fetchPostJson = (path: string, body: any, options: RequestInit = {}) =>
+export const fetchPostJson = (path: string, body?: any, options: RequestInit = {}) =>
     fetchWithJson(path, body, { method: 'POST', ...options });
 
-export const fetchPostForm = (path: string, body: any, options: RequestInit = {}) =>
+export const fetchPostForm = (path: string, body?: any, options: RequestInit = {}) =>
     fetchWithForm(path, body, { method: 'POST', ...options });
 
-export const fetchPutJson = (path: string, body: any, options: RequestInit = {}) =>
+export const fetchPutJson = (path: string, body?: any, options: RequestInit = {}) =>
     fetchWithJson(path, body, { method: 'PUT', ...options });
 
-export const fetchPutForm = (path: string, body: any, options: RequestInit = {}) =>
+export const fetchPutForm = (path: string, body?: any, options: RequestInit = {}) =>
     fetchWithForm(path, body, { method: 'PUT', ...options });
 
-export const fetchDeleteJson = (path: string, body: any, options: RequestInit = {}) =>
+export const fetchDeleteJson = (path: string, body?: any, options: RequestInit = {}) =>
     fetchWithJson(path, body, { method: 'DELETE', ...options });
 
-export const fetchDeleteForm = (path: string, body: any, options: RequestInit = {}) =>
+export const fetchDeleteForm = (path: string, body?: any, options: RequestInit = {}) =>
     fetchWithForm(path, body, { method: 'DELETE', ...options });
+
+export class ResponseError extends Error {
+    response: Response;
+
+    constructor(response: Response, ...rest: any) {
+        super(...rest);
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, ResponseError);
+        }
+
+        this.name = 'ResponseError';
+        this.response = response;
+    }
+}