Centralized errors and added their translations. Didn't test

src/services/user.js

@@ -1,4 +1,6 @@
 import db from '../db.js'
+import customError from '../response/customError.js';
+import responseCodes from '../response/responseCodes.js';
 import statuses from '../utils/status.js';
 import bcrypt from 'bcrypt';
 
@@ -12,12 +14,14 @@ class UserService {
 
     async getByUsername(username) {
         let user = (await db.query("SELECT * FROM Users WHERE username = $1", [username])).rows;
-        if (user == undefined) return statuses.not_found;
+        if (user == undefined) throw new customError(`getByUsername user not found`, responseCodes.responses.usernames.not_found);
         return (user[0]);
     }
 
     async getAll() {
-        return (await db.query("SELECT * FROM Users")).rows;
+        let res = await db.query("SELECT * FROM Users");
+        if (res.rowCount == 0) throw new customError(`getAll user not found`, responseCodes.responses.usernames.not_found);
+        return res.rows[0]
     }
 
     async isInGroup(userId, groupId) {
@@ -25,7 +29,7 @@ class UserService {
     }
 
     async joinGroup(userId, groupId) {
-        if (await (this.isInGroup(userId, groupId))) return statuses.duplicate;
+        if (await (this.isInGroup(userId, groupId))) throw new customError(`joinGroup user already in group`, responseCodes.responses.user.already_in_group);
         await db.query("UPDATE Users SET groups = array_append(groups, $1::integer) WHERE ID = $2", [groupId, userId]);
         return statuses.ok;
     }