diff --git a/src/pages/category/create.tsx b/src/pages/category/create.tsx
index c609806..29eaad3 100644
--- a/src/pages/category/create.tsx
+++ b/src/pages/category/create.tsx
@@ -7,6 +7,7 @@ import FormLayout from "components/FormLayout";
 import PageTransition from "components/PageTransition";
 import TextBox from "components/TextBox";
 
+import PATHS from "constants/paths";
 import useAutoFocus from "hooks/useAutoFocus";
 import { redirectWithoutClientCache } from "utils/client";
 import { HandleAxiosError } from "utils/front";
@@ -36,8 +37,10 @@ function CreateCategory() {
 
     try {
       const { data } = await axios.post("/api/category/create", { name });
+      const { data } = await axios.post(PATHS.API.CATEGORY, { name });
       redirectWithoutClientCache(router, "");
       router.push(`/?categoryId=${data?.categoryId}`);
+      router.push(`${PATHS.HOME}?categoryId=${data?.categoryId}`);
       setSubmitted(true);
     } catch (error) {
       setError(HandleAxiosError(error));
diff --git a/src/pages/category/edit/[cid].tsx b/src/pages/category/edit/[cid].tsx
index 455bec7..d6357ad 100644
--- a/src/pages/category/edit/[cid].tsx
+++ b/src/pages/category/edit/[cid].tsx
@@ -7,10 +7,13 @@ import FormLayout from "components/FormLayout";
 import PageTransition from "components/PageTransition";
 import TextBox from "components/TextBox";
 
+import PATHS from "constants/paths";
 import useAutoFocus from "hooks/useAutoFocus";
+import getUserCategory from "lib/category/getUserCategory";
+import getUser from "lib/user/getUser";
 import { Category } from "types";
-import { BuildCategory, HandleAxiosError } from "utils/front";
-import prisma from "utils/prisma";
+import { HandleAxiosError } from "utils/front";
+import { getSession } from "utils/session";
 
 import styles from "styles/create.module.scss";
 
@@ -35,12 +38,10 @@ function EditCategory({ category }: { category: Category }) {
     nProgress.start();
 
     try {
-      const payload = { name };
-      const { data } = await axios.put(
-        `/api/category/edit/${category.id}`,
-        payload
-      );
-      router.push(`/?categoryId=${data?.categoryId}`);
+      const { data } = await axios.put(`${PATHS.API.CATEGORY}/${category.id}`, {
+        name,
+      });
+      router.push(`${PATHS.HOME}?categoryId=${data?.categoryId}`);
       setSubmitted(true);
     } catch (error) {
       setError(HandleAxiosError(error));
@@ -75,22 +76,21 @@ function EditCategory({ category }: { category: Category }) {
 EditCategory.authRequired = true;
 export default EditCategory;
 
-export async function getServerSideProps({ query }) {
+export async function getServerSideProps({ req, res, query }) {
   const { cid } = query;
-  const categoryDB = await prisma.category.findFirst({
-    where: { id: Number(cid) },
-    include: { links: true, author: true },
-  });
 
-  if (!categoryDB) {
+  const session = await getSession(req, res);
+  const user = await getUser(session);
+
+  const category = await getUserCategory(user, Number(cid));
+  if (!category) {
     return {
       redirect: {
-        destination: "/",
+        destination: PATHS.HOME,
       },
     };
   }
 
-  const category = BuildCategory(categoryDB);
   return {
     props: {
       category: JSON.parse(JSON.stringify(category)),
diff --git a/src/pages/category/remove/[cid].tsx b/src/pages/category/remove/[cid].tsx
index f4ef4e8..8edd906 100644
--- a/src/pages/category/remove/[cid].tsx
+++ b/src/pages/category/remove/[cid].tsx
@@ -8,9 +8,12 @@ import FormLayout from "components/FormLayout";
 import PageTransition from "components/PageTransition";
 import TextBox from "components/TextBox";
 
+import PATHS from "constants/paths";
+import getUserCategory from "lib/category/getUserCategory";
+import getUser from "lib/user/getUser";
 import { Category } from "types";
-import { BuildCategory, HandleAxiosError } from "utils/front";
-import prisma from "utils/prisma";
+import { HandleAxiosError } from "utils/front";
+import { getSession } from "utils/session";
 
 import styles from "styles/create.module.scss";
 
@@ -36,8 +39,8 @@ function RemoveCategory({ category }: { category: Category }) {
     nProgress.start();
 
     try {
-      await axios.delete(`/api/category/remove/${category.id}`);
-      router.push("/");
+      await axios.delete(`${PATHS.API.CATEGORY}/${category.id}`);
+      router.push(PATHS.HOME);
       setSubmitted(true);
     } catch (error) {
       setError(HandleAxiosError(error));
@@ -80,22 +83,21 @@ function RemoveCategory({ category }: { category: Category }) {
 RemoveCategory.authRequired = true;
 export default RemoveCategory;
 
-export async function getServerSideProps({ query }) {
+export async function getServerSideProps({ req, res, query }) {
   const { cid } = query;
-  const categoryDB = await prisma.category.findFirst({
-    where: { id: Number(cid) },
-    include: { links: true, author: true },
-  });
 
-  if (!categoryDB) {
+  const session = await getSession(req, res);
+  const user = await getUser(session);
+
+  const category = await getUserCategory(user, Number(cid));
+  if (!category) {
     return {
       redirect: {
-        destination: "/",
+        destination: PATHS.HOME,
       },
     };
   }
 
-  const category = BuildCategory(categoryDB);
   return {
     props: {
       category: JSON.parse(JSON.stringify(category)),
diff --git a/src/pages/link/create.tsx b/src/pages/link/create.tsx
index aceda9e..71e73ca 100644
--- a/src/pages/link/create.tsx
+++ b/src/pages/link/create.tsx
@@ -9,6 +9,7 @@ import PageTransition from "components/PageTransition";
 import Selector from "components/Selector";
 import TextBox from "components/TextBox";
 
+import PATHS from "constants/paths";
 import useAutoFocus from "hooks/useAutoFocus";
 import getUserCategories from "lib/category/getUserCategories";
 import getUser from "lib/user/getUser";
@@ -51,8 +52,8 @@ function CreateLink({ categories }: { categories: Category[] }) {
 
     try {
       const payload = { name, url, favorite, categoryId };
-      const { data } = await axios.post("/api/link/create", payload);
-      router.push(`/?categoryId=${data?.categoryId}`);
+      const { data } = await axios.post(PATHS.API.LINK, payload);
+      router.push(`${PATHS.HOME}?categoryId=${data?.categoryId}`);
       setSubmitted(true);
     } catch (error) {
       setError(HandleAxiosError(error));
@@ -120,7 +121,7 @@ export async function getServerSideProps({ req, res }) {
   if (categories.length === 0) {
     return {
       redirect: {
-        destination: "/",
+        destination: PATHS.HOME,
       },
     };
   }
diff --git a/src/pages/link/edit/[lid].tsx b/src/pages/link/edit/[lid].tsx
index 678dab3..f7bd793 100644
--- a/src/pages/link/edit/[lid].tsx
+++ b/src/pages/link/edit/[lid].tsx
@@ -12,12 +12,14 @@ import TextBox from "components/TextBox";
 import useAutoFocus from "hooks/useAutoFocus";
 import { Category, Link } from "types";
 import { HandleAxiosError, IsValidURL } from "utils/front";
+import { getSessionOrThrow } from "utils/session";
 
 import getUserCategories from "lib/category/getUserCategories";
 import getUserLink from "lib/link/getUserLink";
 import getUserOrThrow from "lib/user/getUserOrThrow";
+
+import PATHS from "constants/paths";
 import styles from "styles/create.module.scss";
-import { getSessionOrThrow } from "utils/session";
 
 function EditLink({
   link,
@@ -71,8 +73,8 @@ function EditLink({
 
     try {
       const payload = { name, url, favorite, categoryId };
-      const { data } = await axios.put(`/api/link/edit/${link.id}`, payload);
-      router.push(`/?categoryId=${data?.categoryId}`);
+      const { data } = await axios.put(`${PATHS.API.LINK}/${link.id}`, payload);
+      router.push(`${PATHS.HOME}?categoryId=${data?.categoryId}`);
       setSubmitted(true);
     } catch (error) {
       setError(HandleAxiosError(error));
@@ -142,7 +144,7 @@ export async function getServerSideProps({ req, res, query }) {
   if (!link) {
     return {
       redirect: {
-        destination: "/",
+        destination: PATHS.HOME,
       },
     };
   }
diff --git a/src/pages/link/remove/[lid].tsx b/src/pages/link/remove/[lid].tsx
index 6fe10a5..e4d2495 100644
--- a/src/pages/link/remove/[lid].tsx
+++ b/src/pages/link/remove/[lid].tsx
@@ -8,6 +8,7 @@ import FormLayout from "components/FormLayout";
 import PageTransition from "components/PageTransition";
 import TextBox from "components/TextBox";
 
+import PATHS from "constants/paths";
 import getUserLink from "lib/link/getUserLink";
 import getUser from "lib/user/getUser";
 import { Link } from "types";
@@ -34,8 +35,8 @@ function RemoveLink({ link }: { link: Link }) {
     nProgress.start();
 
     try {
-      const { data } = await axios.delete(`/api/link/remove/${link.id}`);
-      router.push(`/?categoryId=${data?.categoryId}`);
+      const { data } = await axios.delete(`${PATHS.API.LINK}/${link.id}`);
+      router.push(`${PATHS.HOME}?categoryId=${data?.categoryId}`);
       setSubmitted(true);
     } catch (error) {
       setError(HandleAxiosError(error));
@@ -106,7 +107,7 @@ export async function getServerSideProps({ req, res, query }) {
   if (!link) {
     return {
       redirect: {
-        destination: "/",
+        destination: PATHS.HOME,
       },
     };
   }