Node (Express) API: Authorization
This tutorial demonstrates how to add authentication and authorization to an Express.js API. We recommend you to Log in to follow this quickstart with examples configured for your account.
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Configure Auth0 APIs
Create an API
In the APIs section of the Auth0 dashboard, click Create API. Provide a name and an identifier for your API, for example
https://quickstarts/api. You will use the identifier as an
audience later, when you are configuring the Access Token verification. For Signing Algorithm, select RS256.
By default, your API uses RS256 as the algorithm for signing tokens. Since RS256 uses a private/public keypair, it verifies the tokens against the public key for your Auth0 account. The public key is in the JSON Web Key Set (JWKS) format, and can be accessed here.
Scopes let you define which resources can be accessed by the user with a given Access Token. For example, you might choose to grant read access to the
messages resource if users have the manager access level, and a write access to that resource if they have the administrator access level.
You can add the required scopes in the Scopes tab of the Auth0 Dashboard's APIs section.
This example demonstrates:
Validate Access Tokens
To get your Auth0 public key and complete the verification process, you can use the jwks-rsa library with the package.
Install these libraries with npm.
Configure the middleware
Configure the express-jwt middleware so it uses the remote JWKS for your Auth0 account.
checkJwt middleware shown above checks if the user's Access Token included in the request is valid. If the token is not valid, the user gets a 401 Authorization error when they try to access the endpoints. The middleware doesn't check if the token has the sufficient scope to access the requested resources.
Protect API Endpoints
The routes shown below are available for the following requests:
GET /api/public: available for non-authenticated requests
GET /api/private: available for authenticated requests containing an Access Token with no additional scopes
GET /api/private-scoped: available for authenticated requests containing an Access Token with the
To protect an individual route that requires a valid JWT, configure the route with the
checkJwt express-jwt middleware.
You can configure individual routes to look for a particular scope. To achieve that, set up another middleware with the express-jwt-authz package. Provide an array of the required scopes and apply the middleware to any routes you want to add authorization to.
checkScopes middlewares to the route you want to protect.
In this configuration, only the Access Tokens with the
read:messages scope can access the endpoint.