diff --git a/src/config/cache.ts b/src/config/cache.ts
index 2f5cf52..916047e 100644
--- a/src/config/cache.ts
+++ b/src/config/cache.ts
@@ -4,47 +4,52 @@ import { Redis } from "ioredis";
 config();
 
 export class AniwatchAPICache {
-  private _client: Redis | null;
-  public isOptional: boolean = true;
+    private _client: Redis | null;
+    public isOptional: boolean = true;
 
-  static DEFAULT_CACHE_EXPIRY_SECONDS = 60 as const;
-  static CACHE_EXPIRY_HEADER_NAME = "X-ANIWATCH-CACHE-EXPIRY" as const;
+    static DEFAULT_CACHE_EXPIRY_SECONDS = 60 as const;
+    static CACHE_EXPIRY_HEADER_NAME = "X-ANIWATCH-CACHE-EXPIRY" as const;
 
-  constructor() {
-    const redisConnURL = process.env?.ANIWATCH_API_REDIS_CONN_URL;
-    this.isOptional = !Boolean(redisConnURL);
-    this._client = this.isOptional ? null : new Redis(String(redisConnURL));
-  }
-
-  set(key: string | Buffer, value: string | Buffer | number) {
-    if (this.isOptional) return;
-    return this._client?.set(key, value);
-  }
-
-  get(key: string | Buffer) {
-    if (this.isOptional) return;
-    return this._client?.get(key);
-  }
-
-  /**
-   * @param expirySeconds set to 60 by default
-   */
-  async getOrSet<T>(
-    setCB: () => Promise<T>,
-    key: string | Buffer,
-    expirySeconds: number = AniwatchAPICache.DEFAULT_CACHE_EXPIRY_SECONDS
-  ) {
-    const cachedData = this.isOptional
-      ? null
-      : (await this._client?.get(key)) || null;
-    let data = JSON.parse(String(cachedData)) as T;
-
-    if (!data) {
-      data = await setCB();
-      await this._client?.set(key, JSON.stringify(data), "EX", expirySeconds);
+    constructor() {
+        const redisConnURL = process.env?.ANIWATCH_API_REDIS_CONN_URL;
+        this.isOptional = !Boolean(redisConnURL);
+        this._client = this.isOptional ? null : new Redis(String(redisConnURL));
+    }
+
+    set(key: string | Buffer, value: string | Buffer | number) {
+        if (this.isOptional) return;
+        return this._client?.set(key, value);
+    }
+
+    get(key: string | Buffer) {
+        if (this.isOptional) return;
+        return this._client?.get(key);
+    }
+
+    /**
+     * @param expirySeconds set to 60 by default
+     */
+    async getOrSet<T>(
+        setCB: () => Promise<T>,
+        key: string | Buffer,
+        expirySeconds: number = AniwatchAPICache.DEFAULT_CACHE_EXPIRY_SECONDS
+    ) {
+        const cachedData = this.isOptional
+            ? null
+            : (await this._client?.get(key)) || null;
+        let data = JSON.parse(String(cachedData)) as T;
+
+        if (!data) {
+            data = await setCB();
+            await this._client?.set(
+                key,
+                JSON.stringify(data),
+                "EX",
+                expirySeconds
+            );
+        }
+        return data;
     }
-    return data;
-  }
 }
 
 export const cache = new AniwatchAPICache();
diff --git a/src/server.ts b/src/server.ts
index acc064a..9164666 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -5,8 +5,8 @@ import corsConfig from "./config/cors.js";
 import { ratelimit } from "./config/ratelimit.js";
 
 import {
-  cacheConfigSetter,
-  cacheControlMiddleware,
+    cacheConfigSetter,
+    cacheControlMiddleware,
 } from "./middleware/cache.js";
 import { hianimeRouter } from "./routes/hianime.js";
 
@@ -36,52 +36,57 @@ app.use(cacheControlMiddleware);
 // or other issues if you do.
 const ISNT_PERSONAL_DEPLOYMENT = Boolean(ANIWATCH_API_HOSTNAME);
 if (ISNT_PERSONAL_DEPLOYMENT) {
-  app.use(ratelimit);
+    app.use(ratelimit);
 }
 
 app.use("/", serveStatic({ root: "public" }));
 app.get("/health", (c) => c.text("daijoubu", { status: 200 }));
 app.get("/v", async (c) =>
-  c.text(
-    `v${"version" in pkgJson && pkgJson?.version ? pkgJson.version : "-1"}`
-  )
+    c.text(
+        `v${"version" in pkgJson && pkgJson?.version ? pkgJson.version : "-1"}`
+    )
 );
 
 app.use(cacheConfigSetter(BASE_PATH.length));
 
 app.basePath(BASE_PATH).route("/hianime", hianimeRouter);
-app
-  .basePath(BASE_PATH)
-  .get("/anicrush", (c) => c.text("Anicrush could be implemented in future."));
+app.basePath(BASE_PATH).get("/anicrush", (c) =>
+    c.text("Anicrush could be implemented in future.")
+);
 
 app.notFound(notFoundHandler);
 app.onError(errorHandler);
 
 // NOTE: this env is "required" for vercel deployments
 if (!Boolean(process.env?.ANIWATCH_API_VERCEL_DEPLOYMENT)) {
-  serve({
-    port: PORT,
-    fetch: app.fetch,
-  }).addListener("listening", () =>
-    console.info(
-      "\x1b[1;36m" + `aniwatch-api at http://localhost:${PORT}` + "\x1b[0m"
-    )
-  );
+    serve({
+        port: PORT,
+        fetch: app.fetch,
+    }).addListener("listening", () =>
+        console.info(
+            "\x1b[1;36m" +
+                `aniwatch-api at http://localhost:${PORT}` +
+                "\x1b[0m"
+        )
+    );
 
-  // NOTE: remove the `if` block below for personal deployments
-  if (ISNT_PERSONAL_DEPLOYMENT) {
-    const interval = 9 * 60 * 1000; // 9mins
+    // NOTE: remove the `if` block below for personal deployments
+    if (ISNT_PERSONAL_DEPLOYMENT) {
+        const interval = 9 * 60 * 1000; // 9mins
 
-    // don't sleep
-    setInterval(() => {
-      console.log("aniwatch-api HEALTH_CHECK at", new Date().toISOString());
-      https
-        .get(`https://${ANIWATCH_API_HOSTNAME}/health`)
-        .on("error", (err) => {
-          console.error(err.message);
-        });
-    }, interval);
-  }
+        // don't sleep
+        setInterval(() => {
+            console.log(
+                "aniwatch-api HEALTH_CHECK at",
+                new Date().toISOString()
+            );
+            https
+                .get(`https://${ANIWATCH_API_HOSTNAME}/health`)
+                .on("error", (err) => {
+                    console.error(err.message);
+                });
+        }, interval);
+    }
 }
 
 export default app;