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Community Blog Securing APIs with JWT Tokens in Alibaba Cloud API Gateway

Securing APIs with JWT Tokens in Alibaba Cloud API Gateway

This blog explores how you can integrate JWT token authentication with Alibaba Cloud’s API Gateway to secure your APIs and manage access control effectively.

By Radityo Pradana, Solution Architect Alibaba Cloud Indonesia

In today's digital landscape, API security is more critical than ever. Ensuring that only authorized users can access your API services while preventing unauthorized access is a key priority for any organization. One of the most widely adopted methods for API authentication is the use of JSON Web Tokens (JWT). In this blog, we'll explore how you can integrate JWT token authentication with Alibaba Cloud's API Gateway to secure your APIs and manage access control effectively.

What is JWT?

JSON Web Token (JWT) is an open standard for securely transmitting information between parties as a JSON object. It is widely used in modern applications for user authentication and authorization. A JWT typically consists of three parts:

  1. Header: Contains metadata, such as the signing algorithm.
  2. Payload: Contains the claims, or the information being transmitted (e.g., user ID, roles, permissions).
  3. Signature: Ensures the integrity of the token and verifies its authenticity.

JWTs are signed using a secret key or a public/private key pair, ensuring that the token's contents haven't been tampered with.

Why Use JWT with API Gateway?

Using JWT tokens with API Gateway offers several advantages:

Stateless Authentication: JWT is stateless, meaning that once the token is issued, there is no need to maintain session information on the server. This reduces server-side overhead.

Scalability: Since JWT tokens are self-contained and don’t require server-side storage, they are ideal for scalable microservices architectures.

Security: With JWT, you can easily manage authorization by embedding roles, permissions, and other claims directly into the token, ensuring that each API request is properly authenticated.

How to Use JWT with Alibaba Cloud API Gateway

Leveraging JWT with Alibaba Cloud API Gateway comes with several steps:

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1. Generate a JWK pair

There are several methods in creating a JWK pair to be used to issue a token. In this example, we will be using online JWK generator. We will be capturing both private key and public key from this operation.

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2. Use the private key in the JWK pair to issue a token

Once JWK pair is generated, we will be using the public key and private key to issue a token. There are several ways to generate a token, in this example we will be using another online Token generator. We will be capturing the encoded token to be integrated with our API

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3. Configure the public key in the JWK pair for a JWT authentication plug-in

• Log on to the API Gateway console.

• In the left-side navigation pane, choose Manage APIs > Plug-ins.

• On the Plug-ins page, click Create Plug-in in the upper-right corner.

• On the Create Plug-in page, set Plug-in Type to JWT Authorization. The following example shows the configurations of a JWT authentication plug-in.

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4. Bind a JWT authentication plug-in to APIs

On the Plug-in List page, find the JWT authentication plug-in you created and click Bind API in the Actions column. In the Bind API dialog box, specify an API group and environment to select APIs, add the APIs to the Selected APIs pane, and click OK.

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5. Test the API

With the API bound with JWT plugin, the API will require encoded token to be included in the request header in order to pass the authorization. The sample of calling the API with the token included is as follow:

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More information and documentation for API Gateway with JWT can be found here:

https://www.alibabacloud.com/help/en/api-gateway/traditional-api-gateway/user-guide/jwt-based-authentication

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Alibaba Cloud Indonesia

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