# Authorization in Nestjs API using Auth0 - Step by Step #Series Part-1

Authorization in Nestjs API using Auth0 - Step by Step #Series Part-1
%[https://www.youtube.com/watch?v=1P44lR6JBzA]


## NestJS Authentication and Authorization with Auth0: A Step-by-Step Guide (Part 1)

**Introduction**

Implementing robust authentication and authorization is crucial for protecting your NestJS API and ensuring secure access to sensitive data. Auth0, a leading identity management platform, provides a streamlined solution for integrating authentication and authorization into your applications.

In this blog post, we'll guide you through the process of setting up authentication and authorization in your NestJS API using Auth0.

**Step 1: Create an Auth0 Account and Application**

1. **Sign up for an Auth0 account:** Visit the Auth0 website and create a free account.
2. **Create a new application:** Go to the Applications section and create a new application for your NestJS API.
3. **Configure the application:** Set the application's name, callback URL (e.g., `http://localhost:3000/callback`), and any other necessary settings.

**Step 2: Install Required Packages**

Install the necessary packages in your NestJS project:

```bash
npm install @nestjs/passport @nestjs/jwt auth0-spa
```

**Step 3: Create an Authentication Service**

Create a service to handle authentication and authorization logic:

```typescript
import { Injectable } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';
import { Auth0Client } from '@auth0/auth0-spa';

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor(private readonly auth0Client: Auth0Client) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      secretOrKey: process.env.AUTH0_SECRET,
      audience: process.env.AUTH0_AUDIENCE,
      issuer: `https://${process.env.AUTH0_DOMAIN}/`
    });
  }

  validate(payload: any) {
    return this.auth0Client.getUser(payload.sub);
  }
}
```

**Step 4: Configure the Passport Module**

In your `app.module.ts`, configure the Passport module:

```typescript
import { Module } from '@nestjs/common';
import { JwtModule } from '@nestjs/jwt';
import { PassportModule } from '@nestjs/passport';
import { Auth0Strategy } from './auth/auth0.strategy';

@Module({
  imports: [
    PassportModule.register({ defaultStrategy: 'jwt' }),
    JwtModule.register({
      secret: process.env.AUTH0_SECRET,
      signOptions: { expiresIn: '1h' },
    }),
  ],
  providers: [Auth0Strategy],
})
export class AuthModule {}
```

**Step 5: Protect Routes**

Use the `AuthGuard` to protect routes that require authentication:

```typescript
import { Controller, Get, UseGuards } from '@nestjs/common';
import { AuthGuard } from '@nestjs/passport';

@Controller('profile')
@UseGuards(AuthGuard())
export class ProfileController {
  @Get()
  getProfile() {
    // Access user data here
  }
}
```

Part-1 
%[https://www.youtube.com/watch?v=1P44lR6JBzA ]


Part-2
%[https://www.youtube.com/watch?v=1P44lR6JBzA ]

Part 3
%[https://www.youtube.com/watch?v=Hz1qFgKw6gc]


**In the next part of this series, we'll delve deeper into authorization, role-based access control, and best practices for securing your NestJS API with Auth0.**

**Keywords:** NestJS, Auth0, authentication, authorization, security, API, web development