Make backend and frontend work together

backend/src/routes/api/auth/auth.controller.ts

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+import {
+  Controller,
+  Post,
+  UseGuards,
+  Request,
+  Body,
+  Get,
+  ConflictException,
+  NotFoundException,
+  InternalServerErrorException,
+} from '@nestjs/common';
+import { LocalAuthGuard } from './local-auth.guard';
+import {
+  RegisterRequestDto,
+  LoginResponseDto,
+  DeleteRequestDto,
+} from './auth.dto';
+import { AuthService } from './auth.service';
+import { JwtAuthGuard } from './jwt.guard';
+import { AdminGuard } from './admin.guard';
+import { HasFailed } from 'src/types/failable';
+
+@Controller('api/auth')
+export class AuthController {
+  constructor(private authService: AuthService) {}
+
+  @UseGuards(LocalAuthGuard)
+  @Post('login')
+  async login(@Request() req) {
+    const response: LoginResponseDto = {
+      access_token: await this.authService.createToken(req.user),
+    };
+
+    return response;
+  }
+
+  @UseGuards(JwtAuthGuard, AdminGuard)
+  @Post('create')
+  async register(@Request() req, @Body() register: RegisterRequestDto) {
+    const user = await this.authService.createUser(
+      register.username,
+      register.password,
+    );
+
+    if (HasFailed(user)) throw new ConflictException('User already exists');
+
+    if (register.isAdmin) {
+      await this.authService.makeAdmin(user);
+    }
+
+    return this.authService.userEntityToUser(user);
+  }
+
+  @UseGuards(JwtAuthGuard, AdminGuard)
+  @Post('delete')
+  async delete(@Request() req, @Body() deleteData: DeleteRequestDto) {
+    const user = await this.authService.deleteUser(deleteData.username);
+    if (HasFailed(user)) throw new NotFoundException('User does not exist');
+
+    return this.authService.userEntityToUser(user);
+  }
+
+  @UseGuards(JwtAuthGuard, AdminGuard)
+  @Get('list')
+  async listUsers(@Request() req) {
+    const users = this.authService.listUsers();
+
+    if (HasFailed(users))
+      throw new InternalServerErrorException('Could not list users');
+
+    return users;
+  }
+
+  @UseGuards(JwtAuthGuard)
+  @Get('me')
+  async me(@Request() req) {
+    return req.user;
+  }
+}
+
+//eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyIjp7InVzZXJuYW1lIjoiYWRtaW4iLCJpc0FkbWluIjp0cnVlfSwiaWF0IjoxNjQ1NDUxMzg1LCJleHAiOjE2NDU1Mzc3ODV9.Uf6JmygblXgBS4ztTcfZl6m579YjH2R0uD0QyNCfQNs