diff --git a/.gitignore b/.gitignore
index c423139..637b488 100644
--- a/.gitignore
+++ b/.gitignore
@@ -88,4 +88,4 @@
 /BackEnd/configs/OS.js
 /BackEnd/src/configs/OS.ts
 /BackEnd/dist
-
+/BackEnd/.env*
diff --git a/BackEnd/package-lock.json b/BackEnd/package-lock.json
index fe90788..d928b04 100644
--- a/BackEnd/package-lock.json
+++ b/BackEnd/package-lock.json
@@ -14,7 +14,9 @@
         "body-parser": "^1.19.0",
         "child_process": "^1.0.2",
         "cors": "2.8.5",
+        "dotenv": "^10.0.0",
         "ejs": "3.1.5",
+        "envalid": "^7.1.1",
         "errorhandler": "1.5.1",
         "express": "^4.17.1",
         "express-generator": "^4.16.1",
@@ -2969,6 +2971,14 @@
         "node": ">=4"
       }
     },
+    "node_modules/dotenv": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-10.0.0.tgz",
+      "integrity": "sha512-rlBi9d8jpv9Sf1klPjNfFAuWDjKLwTIJJ/VxtoTwIR6hnZxcEOQCZg2oIL3MWBYw5GpUDKOEnND7LXTbIpQ03Q==",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/duplexer2": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/duplexer2/-/duplexer2-0.1.4.tgz",
@@ -3137,6 +3147,14 @@
       "integrity": "sha512-f2LZMYl1Fzu7YSBKg+RoROelpOaNrcGmE9AZubeDfrCEia483oW4MI4VyFd5VNHIgQ/7qm1I0wUHK1eJnn2y2w==",
       "dev": true
     },
+    "node_modules/envalid": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/envalid/-/envalid-7.1.1.tgz",
+      "integrity": "sha512-2MIPjXAWcAVsO2jTVbgMFRc66lQCy2bQDP+zPT3NucrbWMD3pij5iGZMwQiv3zdveyVfl0qAGpI1JRQGfkmu1w==",
+      "engines": {
+        "node": ">=8.12"
+      }
+    },
     "node_modules/error-ex": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
@@ -14646,6 +14664,11 @@
         "is-obj": "^1.0.0"
       }
     },
+    "dotenv": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-10.0.0.tgz",
+      "integrity": "sha512-rlBi9d8jpv9Sf1klPjNfFAuWDjKLwTIJJ/VxtoTwIR6hnZxcEOQCZg2oIL3MWBYw5GpUDKOEnND7LXTbIpQ03Q=="
+    },
     "duplexer2": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/duplexer2/-/duplexer2-0.1.4.tgz",
@@ -14805,6 +14828,11 @@
       "integrity": "sha512-f2LZMYl1Fzu7YSBKg+RoROelpOaNrcGmE9AZubeDfrCEia483oW4MI4VyFd5VNHIgQ/7qm1I0wUHK1eJnn2y2w==",
       "dev": true
     },
+    "envalid": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/envalid/-/envalid-7.1.1.tgz",
+      "integrity": "sha512-2MIPjXAWcAVsO2jTVbgMFRc66lQCy2bQDP+zPT3NucrbWMD3pij5iGZMwQiv3zdveyVfl0qAGpI1JRQGfkmu1w=="
+    },
     "error-ex": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
diff --git a/BackEnd/package.json b/BackEnd/package.json
index 20a508e..88ce5e2 100644
--- a/BackEnd/package.json
+++ b/BackEnd/package.json
@@ -20,7 +20,9 @@
     "body-parser": "^1.19.0",
     "child_process": "^1.0.2",
     "cors": "2.8.5",
+    "dotenv": "^10.0.0",
     "ejs": "3.1.5",
+    "envalid": "^7.1.1",
     "errorhandler": "1.5.1",
     "express": "^4.17.1",
     "express-generator": "^4.16.1",
diff --git a/BackEnd/src/env/db.ts b/BackEnd/src/env/db.ts
new file mode 100644
index 0000000..efba7fa
--- /dev/null
+++ b/BackEnd/src/env/db.ts
@@ -0,0 +1,2 @@
+export default {
+}
diff --git a/BackEnd/src/env/index.ts b/BackEnd/src/env/index.ts
new file mode 100644
index 0000000..55bee50
--- /dev/null
+++ b/BackEnd/src/env/index.ts
@@ -0,0 +1,15 @@
+import { cleanEnv, str } from 'envalid';
+
+import serverEnv from './server';
+import dbEnv from './db';
+
+const env = cleanEnv(process.env, {
+  NODE_ENV: str({
+    choices: ["development", "test", "production"],
+  }),
+
+  ...serverEnv,
+  ...dbEnv,
+})
+
+export default env;
diff --git a/BackEnd/src/env/server.ts b/BackEnd/src/env/server.ts
new file mode 100644
index 0000000..efba7fa
--- /dev/null
+++ b/BackEnd/src/env/server.ts
@@ -0,0 +1,2 @@
+export default {
+}
diff --git a/BackEnd/src/env/utils.ts b/BackEnd/src/env/utils.ts
new file mode 100644
index 0000000..5bc0efa
--- /dev/null
+++ b/BackEnd/src/env/utils.ts
@@ -0,0 +1,11 @@
+export function ownDefault<T>({ dev, test, all } :
+                              {dev : T, test : T, all : T}) {
+  switch(process.env.NODE_ENV) {
+  case "test":
+    return test;
+  case "development":
+    return dev;
+  default:
+    return all;
+  }
+}