diff --git a/src/utils/access_token.ts b/src/utils/access_token.ts
index fe495ed2..9ba96b40 100644
--- a/src/utils/access_token.ts
+++ b/src/utils/access_token.ts
@@ -109,11 +109,11 @@ function base64url(binary: Uint8Array): string {
   return urlSafeOutput;
 }
 
-async function sha256(random_string: string): Promise<Uint8Array> {
+async function sha256(randomString: string): Promise<Uint8Array> {
   return new Uint8Array(
     await crypto.subtle.digest(
       "SHA-256",
-      new TextEncoder().encode(random_string),
+      new TextEncoder().encode(randomString),
     ),
   );
 }
diff --git a/src/utils/info.ts b/src/utils/info.ts
index d163171d..27179c79 100644
--- a/src/utils/info.ts
+++ b/src/utils/info.ts
@@ -10,6 +10,7 @@ export function getConfigPaths() {
   return {
     configDir,
     updatePath: join(configDir, "update.json"),
+    credentialsPath: join(configDir, "credentials.json"),
   };
 }
 
diff --git a/src/utils/token_storage.ts b/src/utils/token_storage.ts
index 4e2d0195..fe876002 100644
--- a/src/utils/token_storage.ts
+++ b/src/utils/token_storage.ts
@@ -30,7 +30,25 @@ if (Deno.build.os === "darwin") {
     ),
   };
 } else {
-  module = await import("./token_storage/memory.ts");
+  const fs = await import("./token_storage/fs.ts");
+  const memory = await import("./token_storage/memory.ts");
+  module = {
+    get: defaultOnError(
+      "Failed to get token from credentials file",
+      memory.get,
+      fs.get,
+    ),
+    store: defaultOnError(
+      "Failed to store token in credentials file",
+      memory.store,
+      fs.store,
+    ),
+    remove: defaultOnError(
+      "Failed to remove token from credentials file",
+      memory.remove,
+      fs.remove,
+    ),
+  };
 }
 export default module;
 
@@ -50,7 +68,7 @@ function defaultOnError<
         .catch((err) => {
           const spinnerInterrupt = interruptSpinner();
           wait("").start().warn(notification);
-          let errStr = err.toString();
+          let errStr = err.message;
           if (errStr.length > 80) {
             errStr = errStr.slice(0, 80) + "...";
           }
diff --git a/src/utils/token_storage/fs.ts b/src/utils/token_storage/fs.ts
new file mode 100644
index 00000000..12dbb3fe
--- /dev/null
+++ b/src/utils/token_storage/fs.ts
@@ -0,0 +1,42 @@
+import { error } from "../../error.ts";
+import { getConfigPaths } from "../info.ts";
+
+export async function get(): Promise<string | null> {
+  const { credentialsPath } = getConfigPaths();
+  try {
+    const info = await Deno.lstat(credentialsPath);
+    if (!info.isFile || (info.mode & 0o777) !== 0o600) {
+      throw new Error("The credentials file have have been tampered with.");
+    }
+  } catch (e) {
+    if (e instanceof Deno.errors.NotFound) {
+      return null;
+    } else {
+      throw e;
+    }
+  }
+  try {
+    const token = JSON.parse(await Deno.readTextFile(credentialsPath)).token;
+    return token || null;
+  } catch (e) {
+    throw new Error(`The credentials file has been tampered with (${e}).`);
+  }
+}
+
+export async function store(token: string): Promise<void> {
+  const { credentialsPath, configDir } = getConfigPaths();
+  await Deno.mkdir(configDir, { recursive: true });
+  await Deno.writeTextFile(
+    credentialsPath,
+    JSON.stringify({ token }, null, 2),
+    { mode: 0o600 },
+  );
+  return Promise.resolve();
+}
+
+export async function remove(): Promise<void> {
+  const { credentialsPath, configDir } = getConfigPaths();
+  await Deno.mkdir(configDir, { recursive: true });
+  await Deno.writeTextFile(credentialsPath, "{}", { mode: 0o600 });
+  return Promise.resolve();
+}