diff --git a/backend/UserConfig.ts b/backend/UserConfig.ts
index bad2876..d8d1e8a 100644
--- a/backend/UserConfig.ts
+++ b/backend/UserConfig.ts
@@ -1,7 +1,47 @@
+import fs from 'fs-extra';
+import { UserConfiguration, UserConfigTypeChecker } from 'ass';
+
+/**
+ * Returns a boolean if the provided value is a number
+ */
+const numChecker = (val: string) => {
+	try { parseInt(val); return true; }
+	catch (err) { return false; }
+}
+
+/**
+ * User-config property type checker functions
+ */
+const Checkers: UserConfigTypeChecker = {
+	uploadsDir: (val) => {
+		try { fs.accessSync(val); return true; }
+		catch (err) { return false; }
+	},
+	idType: (val) => {
+		const options = ['random', 'original', 'gfycat', 'timestamp', 'zws'];
+		return options.includes(val);
+	},
+	idSize: numChecker,
+	gfySize: numChecker,
+	maximumFileSize: numChecker,
+}
 
 export class UserConfig {
 	private config: UserConfiguration;
 	public getConfig = () => this.config;
 
 	constructor(config?: UserConfiguration) {
+		if (config != null) this.config = this.parseConfig(config);
+	}
+
+	private parseConfig(config: UserConfiguration) {
+		if (!Checkers.uploadsDir(config.uploadsDir)) throw new Error(`Unable to access uploads directory: ${config.uploadsDir}`);
+		if (!Checkers.idType(config.idType)) throw new Error(`Invalid ID type: ${config.idType}`);
+		if (!Checkers.idSize(config.idSize)) throw new Error(`Invalid ID size: ${config.idSize}`);
+		if (!Checkers.gfySize(config.gfySize)) throw new Error(`Invalid Gfy size: ${config.gfySize}`);
+		if (!Checkers.maximumFileSize(config.maximumFileSize)) throw new Error(`Invalid maximum file size: ${config.maximumFileSize}`);
+
+		// All is fine, carry on!
+		return config;
+	}
 }
diff --git a/backend/tsconfig.json b/backend/tsconfig.json
index e2e7770..d62defe 100644
--- a/backend/tsconfig.json
+++ b/backend/tsconfig.json
@@ -5,7 +5,8 @@
 		"lib": [
 			"ES2022",
 		],
-		"moduleResolution": "Node"
+		"moduleResolution": "Node",
+		"strictPropertyInitialization": false
 	},
 	"include": [
 		"./**/*.ts",
diff --git a/common/types.d.ts b/common/types.d.ts
index 22a1147..820e3c9 100644
--- a/common/types.d.ts
+++ b/common/types.d.ts
@@ -19,6 +19,14 @@ declare module 'ass' {
 		gfySize: number;
 		maximumFileSize: number;
 	}
+
+	interface UserConfigTypeChecker {
+		uploadsDir: (val: any) => boolean;
+		idType: (val: any) => boolean;
+		idSize: (val: any) => boolean;
+		gfySize: (val: any) => boolean;
+		maximumFileSize: (val: any) => boolean;
+	}
 }
 
 //#region Dummy modules