diff --git a/src/js/constants.js b/src/js/constants.js
new file mode 100644
index 0000000..7c4b2e2
--- /dev/null
+++ b/src/js/constants.js
@@ -0,0 +1,15 @@
+const DEV_URL = `http://localhost:8080`;
+const PROD_URL = `https://oliver.akins.me/top-lists`;
+
+export const HOME_PAGE = process.env.NODE_ENV === `production`
+	? PROD_URL
+	: DEV_URL
+
+export const AUTH_REDIRECT = `${HOME_PAGE}`
+
+export const SPOTIFY_API_BASE = `https://api.spotify.com/v1`;
+
+export const STORAGE_KEYS = {
+	token: `top-lists-auth-token`,
+	state: `top-lists-auth-state`
+};
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