diff --git a/src/app.ts b/src/app.ts
index e7b19d2..2d500f5 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -20,6 +20,14 @@ const APP_PORT = +(process.env.APP_PORT || 3000);
 
   RegisterRoutes(app);
 
+  app.get("*", (_, res) =>
+    res.status(404).send({
+      status: 404,
+      message: "Route not found.",
+      devMessage: "unknown_url",
+    }),
+  );
+
   app.use(error);
 
   app.listen(APP_PORT, APP_HOST, () => console.log(`Listening on: http://localhost:${APP_PORT}`));
diff --git a/src/controllers/branch/branch-controller.ts b/src/controllers/branch/branch-controller.ts
index 20828b1..21c1bac 100644
--- a/src/controllers/branch/branch-controller.ts
+++ b/src/controllers/branch/branch-controller.ts
@@ -95,7 +95,7 @@ export class BranchController extends Controller {
 
   @Get("{branchId}")
   async getBranchById(@Path() branchId: string) {
-    return await prisma.branch.findFirst({
+    const record = await prisma.branch.findFirst({
       include: {
         province: true,
         district: true,
@@ -103,6 +103,12 @@ export class BranchController extends Controller {
       },
       where: { id: branchId },
     });
+
+    if (!record) {
+      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "data_not_found");
+    }
+
+    return record;
   }
 
   @Post()
@@ -115,13 +121,29 @@ export class BranchController extends Controller {
         prisma.branch.findFirst({ where: { id: body.headOfficeId || undefined } }),
       ]);
       if (body.provinceId && !province)
-        throw new HttpError(HttpStatus.BAD_REQUEST, "Province cannot be found.");
+        throw new HttpError(
+          HttpStatus.BAD_REQUEST,
+          "Province cannot be found.",
+          "missing_or_invalid_parameter",
+        );
       if (body.districtId && !district)
-        throw new HttpError(HttpStatus.BAD_REQUEST, "District cannot be found.");
+        throw new HttpError(
+          HttpStatus.BAD_REQUEST,
+          "District cannot be found.",
+          "missing_or_invalid_parameter",
+        );
       if (body.subDistrictId && !subDistrict)
-        throw new HttpError(HttpStatus.BAD_REQUEST, "Sub-district cannot be found.");
+        throw new HttpError(
+          HttpStatus.BAD_REQUEST,
+          "Sub-district cannot be found.",
+          "missing_or_invalid_parameter",
+        );
       if (body.headOfficeId && !branch)
-        throw new HttpError(HttpStatus.BAD_REQUEST, "Head branch cannot be found.");
+        throw new HttpError(
+          HttpStatus.BAD_REQUEST,
+          "Head branch cannot be found.",
+          "missing_or_invalid_parameter",
+        );
     }
 
     const { provinceId, districtId, subDistrictId, headOfficeId, ...rest } = body;
@@ -159,13 +181,29 @@ export class BranchController extends Controller {
         prisma.branch.findFirst({ where: { id: body.headOfficeId || undefined } }),
       ]);
       if (body.provinceId && !province)
-        throw new HttpError(HttpStatus.BAD_REQUEST, "Province cannot be found.");
+        throw new HttpError(
+          HttpStatus.BAD_REQUEST,
+          "Province cannot be found.",
+          "missing_or_invalid_parameter",
+        );
       if (body.districtId && !district)
-        throw new HttpError(HttpStatus.BAD_REQUEST, "District cannot be found.");
+        throw new HttpError(
+          HttpStatus.BAD_REQUEST,
+          "District cannot be found.",
+          "missing_or_invalid_parameter",
+        );
       if (body.subDistrictId && !subDistrict)
-        throw new HttpError(HttpStatus.BAD_REQUEST, "Sub-district cannot be found.");
+        throw new HttpError(
+          HttpStatus.BAD_REQUEST,
+          "Sub-district cannot be found.",
+          "missing_or_invalid_parameter",
+        );
       if (body.headOfficeId && !branch)
-        throw new HttpError(HttpStatus.BAD_REQUEST, "Head branch cannot be found.");
+        throw new HttpError(
+          HttpStatus.BAD_REQUEST,
+          "Head branch cannot be found.",
+          "missing_or_invalid_parameter",
+        );
     }
 
     const { provinceId, districtId, subDistrictId, headOfficeId, ...rest } = body;
@@ -196,7 +234,7 @@ export class BranchController extends Controller {
       where: { id: branchId },
     });
     if (!record) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "data_not_found");
     }
     return record;
   }
@@ -213,11 +251,11 @@ export class BranchController extends Controller {
     });
 
     if (!record) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "data_not_found");
     }
 
     if (record.status === Status.USED) {
-      throw new HttpError(HttpStatus.FORBIDDEN, "Branch is in used.");
+      throw new HttpError(HttpStatus.FORBIDDEN, "Branch is in used.", "data_exists");
     }
 
     return await prisma.branch.delete({ where: { id: branchId } });
diff --git a/src/controllers/branch/contact-controller.ts b/src/controllers/branch/contact-controller.ts
index a673f2d..70d10a5 100644
--- a/src/controllers/branch/contact-controller.ts
+++ b/src/controllers/branch/contact-controller.ts
@@ -65,7 +65,13 @@ export class BranchContactController extends Controller {
   async getBranchContactById(@Path() branchId: string, @Path() contactId: string) {
     const record = await prisma.branchContact.findFirst({ where: { id: contactId, branchId } });
 
-    if (!record) throw new HttpError(HttpStatus.NOT_FOUND, "User cannot be found.");
+    if (!record) {
+      throw new HttpError(
+        HttpStatus.NOT_FOUND,
+        "Branch contact cannot be found.",
+        "data_not_found",
+      );
+    }
 
     return Object.assign(record, {
       qrCodeImageUrl: await minio.presignedGetObject(MINIO_BUCKET, imageLocation(record.id)),
@@ -79,7 +85,11 @@ export class BranchContactController extends Controller {
     @Body() body: BranchContactCreate,
   ) {
     if (!(await prisma.branch.findFirst({ where: { id: branchId } }))) {
-      throw new HttpError(HttpStatus.BAD_REQUEST, "Branch not found.");
+      throw new HttpError(
+        HttpStatus.BAD_REQUEST,
+        "Branch not found.",
+        "missing_or_invalid_parameter",
+      );
     }
     const record = await prisma.branchContact.create({
       include: { branch: true },
@@ -112,7 +122,7 @@ export class BranchContactController extends Controller {
       where: { id: contactId, branchId },
     });
     if (!record) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "data_not_found");
     }
     return Object.assign(record, {
       qrCodeImageUrl: await minio.presignedGetObject(
@@ -131,6 +141,8 @@ export class BranchContactController extends Controller {
   @Delete("{contactId}")
   async deleteBranchContact(@Path() branchId: string, @Path() contactId: string) {
     const result = await prisma.branchContact.deleteMany({ where: { id: contactId, branchId } });
-    if (result.count <= 0) throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.");
+    if (result.count <= 0) {
+      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "data_not_found");
+    }
   }
 }
diff --git a/src/interfaces/http-error.ts b/src/interfaces/http-error.ts
index 5d396e2..8abe48b 100644
--- a/src/interfaces/http-error.ts
+++ b/src/interfaces/http-error.ts
@@ -6,13 +6,15 @@ class HttpError extends Error {
    */
   status: HttpStatus;
   message: string;
+  devMessage?: string;
 
-  constructor(status: HttpStatus, message: string) {
+  constructor(status: HttpStatus, message: string, devMessage?: string) {
     super(message);
 
     this.name = "HttpError";
     this.status = status;
     this.message = message;
+    this.devMessage = devMessage;
   }
 }
 
diff --git a/src/middlewares/error.ts b/src/middlewares/error.ts
index b010f0a..d80ceb3 100644
--- a/src/middlewares/error.ts
+++ b/src/middlewares/error.ts
@@ -8,6 +8,7 @@ function error(error: Error, _req: Request, res: Response, _next: NextFunction)
     return res.status(error.status).json({
       status: error.status,
       message: error.message,
+      devMessage: error.devMessage,
     });
   }
 
@@ -16,6 +17,7 @@ function error(error: Error, _req: Request, res: Response, _next: NextFunction)
       status: HttpStatus.UNPROCESSABLE_ENTITY,
       message: "Validation error(s).",
       detail: error.fields,
+      devMessage: "missing_or_invalid_parameter",
     });
   }
 
@@ -24,6 +26,7 @@ function error(error: Error, _req: Request, res: Response, _next: NextFunction)
   return res.status(HttpStatus.INTERNAL_SERVER_ERROR).json({
     status: HttpStatus.INTERNAL_SERVER_ERROR,
     message: error.message,
+    devMessage: "system_error",
   });
 }