diff --git a/bun.lockb b/bun.lockb
index 991cd09..0776f04 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index c72ef9c..39921c4 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "@types/bun": "latest"
   },
   "dependencies": {
+    "env-var": "^7.5.0",
     "gotify": "^1.1.0",
     "ts3-nodejs-library": "^3.4.1",
     "winston": "^3.8.2"
diff --git a/src/app.ts b/src/app.ts
index f985a2c..3b8063e 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -2,8 +2,10 @@ import { Gotify } from "gotify";
 import { QueryProtocol, TeamSpeak, TextMessageTargetMode } from "ts3-nodejs-library"
 import { createLogger, transports, format } from "winston";
 
+import { GOTIFY_TITLE, GOTIFY_TOKEN, GOTIFY_URL, LOG_LEVEL, MODE, TS3_HOST, TS3_NICKNAME, TS3_PASSWORD, TS3_QUERY_PORT, TS3_SERVER_PORT, TS3_USERNAME } from "./env";
+
 const logger = createLogger({
-    level: process.env.LOG_LEVEL,
+    level: LOG_LEVEL,
     transports: [new transports.Console()],
     format: format.combine(
         format.colorize(),
@@ -12,22 +14,22 @@ const logger = createLogger({
 })
 
 const gotify = new Gotify({
-    server: process.env.GOTIFY_URL,
+    server: GOTIFY_URL,
 })
 
 const gotifyConfig = {
-    app: process.env.GOTIFY_TOKEN,
-    title: process.env.GOTIFY_TITLE || "ts3gotify"
+    app: GOTIFY_TOKEN,
+    title: GOTIFY_TITLE
 }
 
 function getModes() {
     const modeIsProvided = process.env.MODE != undefined
 
     return {
-        connect: modeIsProvided ? process.env.MODE?.includes("connect") || false : true,
-        disconnect: process.env.MODE?.includes("disconnect") || false,
-        moved: process.env.MODE?.includes("moved") || false,
-        message: process.env.MODE?.includes("message") || false
+        connect: MODE?.includes("connect") || false,
+        disconnect: MODE?.includes("disconnect") || false,
+        moved: MODE?.includes("moved") || false,
+        message: MODE?.includes("message") || false
     }
 }
 
@@ -56,13 +58,13 @@ function handleMessage(message: string) {
 }
 
 TeamSpeak.connect({
-    host: process.env.TS3_HOST || "info",
-    queryport: process.env.TS3_QUERY_PORT || 10011,
-    serverport: process.env.TS3_SERVER_PORT || 9987,
+    host: TS3_HOST,
+    queryport: TS3_QUERY_PORT,
+    serverport: TS3_SERVER_PORT,
     protocol: QueryProtocol.RAW,
-    username: process.env.TS3_USERNAME,
-    password: process.env.TS3_PASSWORD,
-    nickname: process.env.TS3_NICKNAME || "ts3gotify",
+    username: TS3_USERNAME,
+    password: TS3_PASSWORD,
+    nickname: TS3_NICKNAME,
 }).then((teamspeak) => {
     const mode = getModes()
 
diff --git a/src/env.ts b/src/env.ts
new file mode 100644
index 0000000..b2d94f8
--- /dev/null
+++ b/src/env.ts
@@ -0,0 +1,51 @@
+import { from } from "env-var";
+
+const envVar = from(process.env, {
+  asLogLevel: (value) => {
+    const logLevels = ["error", "info", "debug"];
+    if (logLevels.includes(value)) {
+      return value;
+    } else {
+      throw new Error("Invalid log level");
+    }
+  },
+  asTs3GotifyMode: (value) => {
+    const modes = ["connect", "disconnect", "moved", "message"];
+    if (modes.includes(value)) {
+      return value;
+    } else {
+      throw new Error("Invalid mode");
+    }
+  },
+});
+
+export const LOG_LEVEL = envVar.get("LOG_LEVEL").default("info").asLogLevel();
+
+export const TS3_HOST = envVar.get("TS3_HOST").required().asString();
+export const TS3_QUERY_PORT = envVar
+  .get("TS3_QUERY_PORT")
+  .default(10011)
+  .asPortNumber();
+export const TS3_SERVER_PORT = envVar
+  .get("TS3_SERVER_PORT")
+  .default(9987)
+  .asPortNumber();
+export const TS3_USERNAME = envVar.get("TS3_USERNAME").required().asString();
+export const TS3_PASSWORD = envVar.get("TS3_PASSWORD").required().asString();
+export const TS3_NICKNAME = envVar
+  .get("TS3_NICKNAME")
+  .default("ts3gotify")
+  .asString();
+
+export const GOTIFY_URL = envVar.get("GOTIFY_URL").required().asUrlString();
+export const GOTIFY_TOKEN = envVar.get("GOTIFY_TOKEN").required().asString();
+export const GOTIFY_TITLE = envVar
+  .get("GOTIFY_TITLE")
+  .default("ts3gotify")
+  .asString();
+
+export const MODE = envVar
+  .get("MODE")
+  .default("['connect']")
+  .asJsonArray()
+  .map((value) => value.asTs3GotifyMode());
diff --git a/src/environment.d.ts b/src/environment.d.ts
deleted file mode 100644
index ecf206c..0000000
--- a/src/environment.d.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-export { };
-
-declare global {
-    namespace NodeJS {
-        interface ProcessEnv {
-            LOG_LEVEL?: "error" | "info" | "debug"
-            TS3_HOST: string;
-            TS3_QUERY_PORT?: number;
-            TS3_SERVER_PORT?: number;
-            TS3_USERNAME: string;
-            TS3_PASSWORD: string;
-            TS3_NICKNAME?: string;
-            GOTIFY_URL: string;
-            GOTIFY_TOKEN: string;
-            GOTIFY_TITLE?: string;
-            MODE?: Array<"connect" | "disconnect" | "moved" | "message">
-        }
-    }
-}