diff --git a/backend/src/config/index.ts b/backend/src/config/index.ts
index 303e98d..2df9a83 100644
--- a/backend/src/config/index.ts
+++ b/backend/src/config/index.ts
@@ -1,16 +1,34 @@
 const SERVER_PORT:number = parseInt(process.env.SERVER_PORT, 10) || 8080;
 
+const VALID_EXPORT_TYPES: {[key:string]: string} = {
+    EPUB: "epub",
+    PDF: "pdf"
+};
+
+const VALID_EXPORT_TYPES_ARRAY = Object.keys(VALID_EXPORT_TYPES).map((key:string) => VALID_EXPORT_TYPES[key]);
+
+const VALID_IMPORT_TYPES: {[key:string]: string} = {
+    WORD: "word",
+    PDF: "pdf",
+    WATTPAD: "wattpad",
+    EVERNOTE: "evernote"
+};
+
+const VALID_IMPORT_TYPES_ARRAY = Object.keys(VALID_IMPORT_TYPES).map((key:string) => VALID_IMPORT_TYPES[key]);
+
 const PROCESSING_TIME_EXPORT_EPUB:number = parseInt(process.env.PROCESSING_TIME_EXPORT_EPUB, 10) || 10;
 const PROCESSING_TIME_EXPORT_PDF:number = parseInt(process.env.PROCESSING_TIME_EXPORT_PDF, 10) || 25;
 const PROCESSING_TIME_IMPORT_ANY:number = parseInt(process.env.PROCESSING_TIME_IMPORT_ANY, 10) || 60;
 
 const PROCESSING_TIME_EXPORT: {[key:string]: number} = {
-    epub: PROCESSING_TIME_EXPORT_EPUB,
-    pdf: PROCESSING_TIME_EXPORT_PDF
+    [VALID_EXPORT_TYPES.EPUB]: PROCESSING_TIME_EXPORT_EPUB,
+    [VALID_EXPORT_TYPES.PDF]: PROCESSING_TIME_EXPORT_PDF
 };
 
 export {
     SERVER_PORT,
     PROCESSING_TIME_EXPORT,
-    PROCESSING_TIME_IMPORT_ANY
+    PROCESSING_TIME_IMPORT_ANY,
+    VALID_EXPORT_TYPES_ARRAY,
+    VALID_IMPORT_TYPES_ARRAY
 }