diff --git a/client/src/config.ts b/client/src/config.ts
new file mode 100644
index 0000000..397995f
--- /dev/null
+++ b/client/src/config.ts
@@ -0,0 +1,2 @@
+// back-end server url
+export const API_URL = process.env.NEXT_PUBLIC_API_URL || "http://localhost:3001";