diff --git a/.env.sample b/.env.sample
index c44f56d..3784206 100644
--- a/.env.sample
+++ b/.env.sample
@@ -7,7 +7,7 @@ SERVER_PORT=4000 # optional, server port (alias: PORT, PUBLIC_SERVER_URL.port) (
 PUBLIC_X_ANON_KEY=...
 X_API_KEY=...
 
-DATABASE_URL=file:local.db
+DATABASE_URL=file:../../local.db
 
 BETTER_AUTH_SECRET=...
 BETTER_AUTH_URL=http://localhost:4000
diff --git a/docs/developer_readme.md b/docs/developer_readme.md
index 34bb0ec..e6f03a3 100644
--- a/docs/developer_readme.md
+++ b/docs/developer_readme.md
@@ -10,8 +10,8 @@ bun install --frozen-lockfile
 ## 開発
 
 ```bash
-# データベースを作成するには、packages/server に移動してから以下のコマンドを実行してください。
-bunx drizzle-kit push
+# データベースを作成するには、 `.env` で `DATABASE_URL` を設定し、以下のコマンドを実行してください。
+bun db push
 ```
 
 ```bash
diff --git a/package.json b/package.json
index 422cd76..940ce6b 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
   "scripts": {
     "dev": "bun --filter=@packages/{web,server} dev",
     "dev:mock": "bun --filter=@packages/{web,server} dev:mock",
+    "db": "cd packages/server; bun --env-file=../../.env drizzle-kit",
     "storybook": "concurrently 'cd packages/server; bun dev' 'cd packages/web; bun run storybook'",
     "build": "cd packages/web && bun run build",
     "check": "bunx biome check .",
diff --git a/packages/server/drizzle.config.ts b/packages/server/drizzle.config.ts
index 165d2a6..af42008 100644
--- a/packages/server/drizzle.config.ts
+++ b/packages/server/drizzle.config.ts
@@ -1,10 +1,11 @@
 import { defineConfig } from "drizzle-kit";
+import { env } from "./lib/env.ts";
 
 export default defineConfig({
   out: "./drizzle",
   schema: "./db/schema.ts",
   dialect: "sqlite",
   dbCredentials: {
-    url: process.env.DATABASE_URL ?? "file:local.db",
+    url: env.DATABASE_URL,
   },
 });
diff --git a/packages/server/lib/auth.ts b/packages/server/lib/auth.ts
index 3f0a01b..d6bcbe8 100644
--- a/packages/server/lib/auth.ts
+++ b/packages/server/lib/auth.ts
@@ -3,6 +3,7 @@ import { drizzleAdapter } from "better-auth/adapters/drizzle";
 import Elysia from "elysia";
 import { db } from "../db/index.ts";
 import * as schema from "../db/schema.ts";
+import { env } from "../lib/env.ts";
 
 export const auth = betterAuth({
   database: drizzleAdapter(db, {
@@ -11,11 +12,11 @@ export const auth = betterAuth({
   }),
   socialProviders: {
     google: {
-      clientId: process.env.GOOGLE_CLIENT_ID as string,
-      clientSecret: process.env.GOOGLE_CLIENT_SECRET as string,
+      clientId: env.GOOGLE_CLIENT_ID,
+      clientSecret: env.GOOGLE_CLIENT_SECRET,
     },
   },
-  trustedOrigins: [process.env.PUBLIC_WEB_URL ?? "http://localhost:3000"],
+  trustedOrigins: [env.PUBLIC_WEB_URL],
 });
 
 const betterAuthMacro = new Elysia({ name: "better-auth" })
diff --git a/packages/server/lib/env.ts b/packages/server/lib/env.ts
new file mode 100644
index 0000000..e4f3181
--- /dev/null
+++ b/packages/server/lib/env.ts
@@ -0,0 +1,14 @@
+import * as e from "./utils/environment.ts";
+
+export const env = {
+  DATABASE_URL: e.string("DATABASE_URL"),
+  PUBLIC_WEB_URL: e.string("PUBLIC_WEB_URL"),
+  GOOGLE_CLIENT_ID: e.string("GOOGLE_CLIENT_ID"),
+  GOOGLE_CLIENT_SECRET: e.string("GOOGLE_CLIENT_SECRET"),
+
+  SERVER_PORT: e.string_optional("SERVER_PORT"),
+  PORT: e.string_optional("PORT"),
+  PUBLIC_SERVER_URL: e.string_optional("PUBLIC_SERVER_URL"),
+
+  PUBLIC_MOCK_DATA: e.boolean("PUBLIC_MOCK_DATA"),
+};
diff --git a/packages/server/lib/utils/environment.ts b/packages/server/lib/utils/environment.ts
new file mode 100644
index 0000000..3c8c636
--- /dev/null
+++ b/packages/server/lib/utils/environment.ts
@@ -0,0 +1,21 @@
+import { panic } from "./panic.ts";
+
+export function string(name: string) {
+  return (
+    string_optional(name) ?? panic(`Environment variable ${name} not found`)
+  );
+}
+export function string_optional(name: string): string | undefined {
+  return process.env[name];
+}
+export function boolean(name: string, fallback?: boolean): boolean {
+  const val = string_optional(name);
+  if (val === "1" || val === "true") {
+    return true;
+  }
+  if (val === "0" || val === "false") {
+    return false;
+  }
+  if (fallback !== undefined) return fallback;
+  panic(`Environment variable ${name} not found`);
+}
diff --git a/packages/server/lib/utils/panic.ts b/packages/server/lib/utils/panic.ts
new file mode 100644
index 0000000..e9cf828
--- /dev/null
+++ b/packages/server/lib/utils/panic.ts
@@ -0,0 +1,3 @@
+export function panic(message: string): never {
+  throw new Error(message);
+}
diff --git a/packages/server/serve.ts b/packages/server/serve.ts
index 943f8b6..17b789a 100644
--- a/packages/server/serve.ts
+++ b/packages/server/serve.ts
@@ -1,17 +1,15 @@
 import { app } from "./app.ts";
+import { env } from "./lib/env.ts";
 
 const port =
-  process.env.SERVER_PORT ??
-  process.env.PORT ??
-  parsePublicServerURL() ??
-  "4000";
+  env.SERVER_PORT ?? env.PORT ?? parsePort(env.PUBLIC_SERVER_URL) ?? "4000";
 
 app.listen(port, () =>
   console.log(`Server started at http://localhost:${port}`),
 );
 
-function parsePublicServerURL() {
-  if (!process.env.PUBLIC_SERVER_URL) return undefined;
-  const url = new URL(process.env.PUBLIC_SERVER_URL);
+function parsePort(urlstr: string | undefined) {
+  if (!urlstr) return undefined;
+  const url = new URL(urlstr);
   return url.port;
 }