Falcor API: Authentication

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Falcor API: Authentication

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This tutorial will show you how to add authorization to a Falcor API. We recommend you to Log in to follow this quickstart with examples configured for your account.

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2 minutes

Get a sample configured with your account settings or check it out on Github.

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System requirements: Falcor 0.1.17 | Express 4.15.2

New to Auth0? Learn how Auth0 works and read about implementing API authentication and authorization using the OAuth 2.0 framework.

Confidential applications

Configure Auth0 APIs

Grant types

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. Leave the Signing Algorithm as RS256.

Create API

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.

ID Tokens

Define Permissions

Permissions let you define how resources can be accessed on behalf of 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 define allowed permissions in the Permissions tab of the Auth0 Dashboard's APIs section.

Configure Permissions

This example uses the read:messages scope.

This example demonstrates:

  • How to check for a JSON Web Token (JWT) in the Authorization header of an incoming HTTP request.

  • How to check if the token is valid, using the JSON Web Key Set (JWKS) for your Auth0 account. To learn more about validating Access Tokens, read the Validate an Access Token tutorial.

Public applications

Validate Access Tokens

Grant types

Add dependencies

Add express-jwt, express-jwt-authz, falcor-express, falcor-router, and falcor-http-datasource to your project.

ID Tokens


Configure the express-jwt middleware to use the remote JWKS for your Auth0 account.

Keep reading

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 read:messages scope granted

To protect an individual route that requires a valid JWT, configure the route with the checkJwt express-jwt middleware.

If you are following along with the sample project you downloaded from the top of this page, base URL for Falcor's model should be set to http://localhost:3000.

Individual routes can be configured to look for a particular scope by setting up another middleware with the express-jwt-authz package. To do so, provide an array of required scopes and apply the middleware to any routes you wish to add authorization to.

Optional Steps

Configuring CORS

If you want to configure CORS, add this code to your Falcor app (assuming your Falcor app is hosted on http://localhost:3010):

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