diff --git a/package-lock.json b/package-lock.json
index f99ef262..cb97ef8a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -946,6 +946,11 @@
                 "tslib": "^1.9.0"
             }
         },
+        "class-transformer": {
+            "version": "0.4.0",
+            "resolved": "https://registry.npmjs.org/class-transformer/-/class-transformer-0.4.0.tgz",
+            "integrity": "sha512-ETWD/H2TbWbKEi7m9N4Km5+cw1hNcqJSxlSYhsLsNjQzWWiZIYA1zafxpK9PwVfaZ6AqR5rrjPVUBGESm5tQUA=="
+        },
         "clean-stack": {
             "version": "2.2.0",
             "resolved": "https://registry.npmjs.org/clean-stack/-/clean-stack-2.2.0.tgz",
@@ -2472,6 +2477,11 @@
                 "resolve": "^1.9.0"
             }
         },
+        "reflect-metadata": {
+            "version": "0.1.13",
+            "resolved": "https://registry.npmjs.org/reflect-metadata/-/reflect-metadata-0.1.13.tgz",
+            "integrity": "sha512-Ts1Y/anZELhSsjMcU605fU9RE4Oi3p5ORujwbIKXfWa+0Zxs510Qrmrce5/Jowq3cHSZSJqBjypxmHarc+vEWg=="
+        },
         "regexpp": {
             "version": "3.1.0",
             "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.1.0.tgz",
diff --git a/package.json b/package.json
index 3aabec53..9311dc00 100644
--- a/package.json
+++ b/package.json
@@ -52,10 +52,12 @@
     },
     "dependencies": {
         "adm-zip": "^0.5.4",
+        "class-transformer": "^0.4.0",
         "cli-progress": "^3.9.0",
         "colors": "^1.4.0",
         "p-map": "^4.0.0",
         "progress-stream": "^2.0.0",
+        "reflect-metadata": "^0.1.13",
         "semver": "^7.3.5",
         "source-map-support": "^0.5.19",
         "uuid": "^8.3.2",
diff --git a/src/main/LauncherServer.ts b/src/main/LauncherServer.ts
index 4370436a..50c55299 100644
--- a/src/main/LauncherServer.ts
+++ b/src/main/LauncherServer.ts
@@ -16,9 +16,8 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import 'source-map-support/register';
-
-const version = require("../../package").version
+import "source-map-support/register"
+import "reflect-metadata"
 
 import { EventEmitter } from "events"
 
@@ -35,6 +34,8 @@ import { ModulesManager } from "./modules/ModulesManager"
 import { ProfilesManager } from "./profiles/ProfilesManager"
 import { UpdatesManager } from "./updates/UpdatesManager"
 
+const version = require("../../package").version
+
 export class LauncherServer extends EventEmitter {
     private _ConfigManager: ConfigManager
     private _LangManager: LangManager
diff --git a/src/main/api/WebSocketManager.ts b/src/main/api/WebSocketManager.ts
index 60464479..6cbe9489 100644
--- a/src/main/api/WebSocketManager.ts
+++ b/src/main/api/WebSocketManager.ts
@@ -52,7 +52,7 @@ export class WebSocketManager {
             // }
 
             try {
-                parsedMessage = JsonHelper.toJSON(message)
+                parsedMessage = JsonHelper.fromJSON(message)
             } catch (error) {
                 return this.wsSend(ws, {
                     uuid: NIL_UUID,
@@ -88,6 +88,6 @@ export class WebSocketManager {
     }
 
     private wsSend(ws: ws, data: wsResponse | wsErrorResponse): void {
-        ws.send(JsonHelper.toString(data))
+        ws.send(JsonHelper.toJSON(data))
     }
 }
diff --git a/src/main/api/types/ErrorResponse.ts b/src/main/api/types/ErrorResponse.ts
index 511fcdb5..37d5ae69 100644
--- a/src/main/api/types/ErrorResponse.ts
+++ b/src/main/api/types/ErrorResponse.ts
@@ -1,3 +1,21 @@
+/**
+ * AuroraLauncher LauncherServer - Server for AuroraLauncher
+ * Copyright (C) 2020 - 2021 AuroraTeam
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 export interface ErrorResponse {
     code: number
     message: string
diff --git a/src/main/api/types/Request.ts b/src/main/api/types/Request.ts
index 6006dcec..c5fb187c 100644
--- a/src/main/api/types/Request.ts
+++ b/src/main/api/types/Request.ts
@@ -1,3 +1,21 @@
+/**
+ * AuroraLauncher LauncherServer - Server for AuroraLauncher
+ * Copyright (C) 2020 - 2021 AuroraTeam
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 export type RequestData = object
 
 export interface Request {
diff --git a/src/main/api/types/Response.ts b/src/main/api/types/Response.ts
index db1a2cc9..baa65a5e 100644
--- a/src/main/api/types/Response.ts
+++ b/src/main/api/types/Response.ts
@@ -1,3 +1,21 @@
+/**
+ * AuroraLauncher LauncherServer - Server for AuroraLauncher
+ * Copyright (C) 2020 - 2021 AuroraTeam
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 export type ResponseData = object
 
 export interface Response {
diff --git a/src/main/config/ConfigManager.ts b/src/main/config/ConfigManager.ts
index 4983c2ac..98ebb9bf 100644
--- a/src/main/config/ConfigManager.ts
+++ b/src/main/config/ConfigManager.ts
@@ -16,11 +16,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import { JsonHelper } from "../helpers/JsonHelper"
+import * as fs from "fs"
+
 import { LogHelper } from "../helpers/LogHelper"
 import { StorageHelper } from "../helpers/StorageHelper"
-import { LauncherServerConfig } from "./LauncherServerConfig"
-import fs = require("fs")
+import { LauncherServerConfig } from "./types/LauncherServerConfig"
 
 export class ConfigManager {
     private config: LauncherServerConfig
@@ -41,18 +41,19 @@ export class ConfigManager {
     }
 
     private load(): void {
-        const config = fs.readFileSync(StorageHelper.configFile)
+        const config = fs.readFileSync(StorageHelper.configFile).toString()
         try {
-            this.config = JsonHelper.toJSON(config.toString())
+            this.config = LauncherServerConfig.fromJSON(config)
         } catch (e) {
             if (e instanceof SyntaxError) {
                 LogHelper.error(e)
                 LogHelper.fatal("Json syntax broken. Try fix or delete LauncherServerConfig.json")
             }
+            LogHelper.fatal(e)
         }
     }
 
     private save(): void {
-        fs.writeFileSync(StorageHelper.configFile, JsonHelper.toString(this.config, true))
+        fs.writeFileSync(StorageHelper.configFile, this.config.toJSON())
     }
 }
diff --git a/src/main/config/types/AuthConfig.ts b/src/main/config/types/AuthConfig.ts
new file mode 100644
index 00000000..bfe8730e
--- /dev/null
+++ b/src/main/config/types/AuthConfig.ts
@@ -0,0 +1,35 @@
+/**
+ * AuroraLauncher LauncherServer - Server for AuroraLauncher
+ * Copyright (C) 2020 - 2021 AuroraTeam
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import { AbstractAuthProvider, AbstractAuthProviderConfig } from "../../auth/authProviders/AbstractAuthProvider"
+import {
+    AbstractTextureProvider,
+    AbstractTextureProviderConfig,
+} from "../../auth/textureProviders/AbstractTextureProvider"
+
+export class AuthConfig {
+    authProvider: AbstractAuthProviderConfig
+    textureProvider: AbstractTextureProviderConfig
+
+    static getDefaults(): AuthConfig {
+        const defaults = new AuthConfig()
+        defaults.authProvider = AbstractAuthProvider.getDefaultConfig()
+        defaults.textureProvider = AbstractTextureProvider.getDefaultConfig()
+        return defaults
+    }
+}
diff --git a/src/main/config/types/LauncherServerConfig.ts b/src/main/config/types/LauncherServerConfig.ts
new file mode 100644
index 00000000..c5fb539d
--- /dev/null
+++ b/src/main/config/types/LauncherServerConfig.ts
@@ -0,0 +1,59 @@
+/**
+ * AuroraLauncher LauncherServer - Server for AuroraLauncher
+ * Copyright (C) 2020 - 2021 AuroraTeam
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import { classToPlain, deserialize } from "class-transformer"
+
+import { JsonHelper } from "../../helpers/JsonHelper"
+import { AuthConfig } from "./AuthConfig"
+import { WebSocketConfig } from "./WebSocketConfig"
+
+// TODO Инфа на будущее, пригодится при версионировании конфигов
+// https://github.com/typestack/class-transformer/tree/v0.4.0#using-versioning-to-control-exposed-and-excluded-properties
+export class LauncherServerConfig {
+    configVersion: number
+    lang: "ru" | "en"
+    env: Envirovement
+    mirrors: string[]
+    auth: AuthConfig
+    ws: WebSocketConfig
+
+    static getDefaults(): LauncherServerConfig {
+        const config = new LauncherServerConfig()
+        config.configVersion = 0
+        config.lang = "ru"
+        config.env = Envirovement.DEV
+        config.mirrors = ["https://mirror.aurora-launcher.ru/"]
+        config.auth = AuthConfig.getDefaults()
+        config.ws = WebSocketConfig.getDefaults()
+        return config
+    }
+
+    public toJSON(): string {
+        return JsonHelper.toJSON(classToPlain(this), true)
+    }
+
+    public static fromJSON(json: string): LauncherServerConfig {
+        return deserialize(LauncherServerConfig, json)
+    }
+}
+
+export enum Envirovement {
+    PRODUCTION = "prod",
+    DEBUG = "debug",
+    DEV = "dev",
+}
diff --git a/src/main/config/LauncherServerConfig.ts b/src/main/config/types/WebSocketConfig.ts
similarity index 52%
rename from src/main/config/LauncherServerConfig.ts
rename to src/main/config/types/WebSocketConfig.ts
index 8df84650..43d34432 100644
--- a/src/main/config/LauncherServerConfig.ts
+++ b/src/main/config/types/WebSocketConfig.ts
@@ -16,12 +16,6 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import { AbstractAuthProvider, AbstractAuthProviderConfig } from "../auth/authProviders/AbstractAuthProvider"
-import {
-    AbstractTextureProvider,
-    AbstractTextureProviderConfig,
-} from "../auth/textureProviders/AbstractTextureProvider"
-
 export class WebSocketConfig {
     address: string
     ip: string
@@ -49,45 +43,3 @@ export class WebSocketConfig {
         return defaults
     }
 }
-
-export class AuthConfig {
-    authProvider: AbstractAuthProviderConfig
-    textureProvider: AbstractTextureProviderConfig
-
-    static getDefaults(): AuthConfig {
-        const defaults = new AuthConfig()
-        defaults.authProvider = AbstractAuthProvider.getDefaultConfig()
-        defaults.textureProvider = AbstractTextureProvider.getDefaultConfig()
-        return defaults
-    }
-}
-
-export enum Envirovement {
-    PRODUCTION = "prod",
-    DEBUG = "debug",
-    DEV = "dev",
-}
-
-export class LauncherServerConfig {
-    configVersion: string
-    lang: string
-
-    env: Envirovement
-
-    updatesUrl: Array<string>
-
-    auth: AuthConfig
-
-    ws: WebSocketConfig
-
-    static getDefaults(): LauncherServerConfig {
-        const config = new LauncherServerConfig()
-        config.configVersion = "0"
-        config.lang = "ru"
-        config.env = Envirovement.DEV
-        config.updatesUrl = ["https://mirror.aurora-launcher.ru/"]
-        config.auth = AuthConfig.getDefaults()
-        config.ws = WebSocketConfig.getDefaults()
-        return config
-    }
-}
diff --git a/src/main/download/FabricManager.ts b/src/main/download/FabricManager.ts
index d7e81ae4..119d9520 100644
--- a/src/main/download/FabricManager.ts
+++ b/src/main/download/FabricManager.ts
@@ -74,7 +74,7 @@ export class FabricManager extends MojangManager {
 
         let loaders: any[]
         try {
-            loaders = JsonHelper.toJSON(loadersData)
+            loaders = JsonHelper.fromJSON(loadersData)
         } catch (error) {
             LogHelper.debug(error)
             LogHelper.error("Error parsing JSON data")
@@ -99,7 +99,7 @@ export class FabricManager extends MojangManager {
         }
 
         try {
-            return JsonHelper.toJSON(versionData)
+            return JsonHelper.fromJSON(versionData)
         } catch (error) {
             LogHelper.debug(error)
             return
diff --git a/src/main/download/MirrorManager.ts b/src/main/download/MirrorManager.ts
index 652734ba..803eb191 100644
--- a/src/main/download/MirrorManager.ts
+++ b/src/main/download/MirrorManager.ts
@@ -37,7 +37,7 @@ export class MirrorManager {
      * @param dirName - Название конечной папки
      */
     async downloadClient(clientName: string, dirName: string): Promise<void> {
-        const mirrors: string[] = App.ConfigManager.getConfig().updatesUrl
+        const mirrors: string[] = App.ConfigManager.getConfig().mirrors
         const clientDir = path.resolve(StorageHelper.updatesDir, dirName)
         if (fs.existsSync(clientDir)) return LogHelper.error(App.LangManager.getTranslate("MirrorManager.dirExist"))
 
@@ -82,7 +82,7 @@ export class MirrorManager {
 
         //Profiles
         App.ProfilesManager.createProfile({
-            ...JsonHelper.toJSON(profile),
+            ...JsonHelper.fromJSON(profile),
             clientDir: dirName,
         } as ClientProfileConfig)
         LogHelper.info(App.LangManager.getTranslate("MirrorManager.client.success"))
@@ -94,7 +94,7 @@ export class MirrorManager {
      * @param dirName - Название конечной папки
      */
     async downloadAssets(assetsName: string, dirName: string): Promise<void> {
-        const mirrors: string[] = App.ConfigManager.getConfig().updatesUrl
+        const mirrors: string[] = App.ConfigManager.getConfig().mirrors
         const assetsDir = path.resolve(StorageHelper.updatesDir, dirName)
         if (fs.existsSync(assetsDir)) return LogHelper.error(App.LangManager.getTranslate("MirrorManager.dirExist"))
 
diff --git a/src/main/download/MojangManager.ts b/src/main/download/MojangManager.ts
index 9e9b6c06..18c1cd1d 100644
--- a/src/main/download/MojangManager.ts
+++ b/src/main/download/MojangManager.ts
@@ -105,7 +105,7 @@ export class MojangManager {
         fs.mkdirSync(path.resolve(assetsDir, "indexes"))
         fs.writeFileSync(path.resolve(assetsDir, `indexes/${version.assets}.json`), assetsFile)
 
-        const assetsData = JsonHelper.toJSON(assetsFile).objects
+        const assetsData = JsonHelper.fromJSON(assetsFile).objects
         const assetsHashes: Set<string> = new Set()
         for (const key in assetsData) {
             const hash = assetsData[key].hash
@@ -186,7 +186,7 @@ export class MojangManager {
 
         let versions
         try {
-            versions = JsonHelper.toJSON(versionsData).versions
+            versions = JsonHelper.fromJSON(versionsData).versions
         } catch (error) {
             LogHelper.debug(error)
             LogHelper.error("Error parsing versions data")
@@ -209,7 +209,7 @@ export class MojangManager {
         }
 
         try {
-            return JsonHelper.toJSON(clientData)
+            return JsonHelper.fromJSON(clientData)
         } catch (error) {
             LogHelper.debug(error)
             LogHelper.error("Error parsing client data")
diff --git a/src/main/helpers/JsonHelper.ts b/src/main/helpers/JsonHelper.ts
index a2ecfb09..4ac59abe 100644
--- a/src/main/helpers/JsonHelper.ts
+++ b/src/main/helpers/JsonHelper.ts
@@ -17,11 +17,22 @@
  */
 
 export class JsonHelper {
-    static toJSON(string: string): any {
+    /**
+     * Преобразовать JSON строку в объект
+     * @param string JSON строка
+     * @returns `Object | Array`
+     */
+    static fromJSON(string: string): any {
         return JSON.parse(string)
     }
 
-    static toString(data: object, pretty = false): string {
-        return pretty ? JSON.stringify(data, null, 4) : JSON.stringify(data)
+    /**
+     * Преобразовать объект в JSON строку
+     * @param obj Пробразуемый объект
+     * @param pretty Форматировать вывод отступами или вывести в одну строку (по умолчанию `false`)
+     * @returns JSON сторка
+     */
+    static toJSON(obj: Record<string, any>, pretty = false): string {
+        return pretty ? JSON.stringify(obj, null, 4) : JSON.stringify(obj)
     }
 }
diff --git a/src/main/profiles/ProfileConfig.ts b/src/main/profiles/ProfileConfig.ts
index 776e39fc..b482249d 100644
--- a/src/main/profiles/ProfileConfig.ts
+++ b/src/main/profiles/ProfileConfig.ts
@@ -86,7 +86,7 @@ export class ClientProfile implements ClientProfileConfig {
     }
 
     public toString(): string {
-        return JsonHelper.toString(this, true)
+        return JsonHelper.toJSON(this, true)
     }
 }
 
diff --git a/src/main/profiles/ProfilesManager.ts b/src/main/profiles/ProfilesManager.ts
index 0ba4ab71..1a82d554 100644
--- a/src/main/profiles/ProfilesManager.ts
+++ b/src/main/profiles/ProfilesManager.ts
@@ -45,7 +45,7 @@ export class ProfilesManager {
             if (!file.endsWith(".json")) return
 
             try {
-                const data = JsonHelper.toJSON(
+                const data = JsonHelper.fromJSON(
                     fs.readFileSync(path.resolve(StorageHelper.profilesDir, file)).toString()
                 )
                 this.profiles.push(new ClientProfile(data))
diff --git a/tsconfig.json b/tsconfig.json
index 754c85f7..51660ce7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,8 +4,9 @@
         "sourceMap": true,
         "noImplicitAny": true,
         "module": "commonjs",
-        "target": "es5",
-        "jsx": "react",
-        "allowJs": true
+        "target": "ES2017",
+        "allowJs": true,
+        "emitDecoratorMetadata": true,
+        "experimentalDecorators": true
     }
-}
\ No newline at end of file
+}