diff --git a/packages/server/src/config.ts b/packages/server/src/config.ts
index e797ac9..da44c81 100644
--- a/packages/server/src/config.ts
+++ b/packages/server/src/config.ts
@@ -1,6 +1,18 @@
+import { Schema as S } from "@effect/schema"
 import { Config } from "effect"
 
 
+export const mode = Config.string("NODE_ENV").pipe(
+    Config.withDefault("development"),
+    Config.validate({
+        message: "Expected 'development' or 'production'",
+        validation: S.is(S.Union(
+            S.Literal("development"),
+            S.Literal("production"),
+        )),
+    })
+)
+
 export const httpPort              = Config.number("HTTP_PORT").pipe(Config.withDefault(8080))
 export const rpcHTTPRoot           = Config.string("RPC_HTTP_ROOT").pipe(Config.withDefault("/rpc"))
 export const rpcHTTPPlaygroundRoot = Config.string("RPC_HTTP_PLAYGROUND_ROOT").pipe(Config.withDefault("/rpc/playground"))