Solving the Agonizing “No Federated JWT” Error in Amplify Gen 2: A Step-by-Step Lambda Function Guide

Are you tired of encountering the infuriating “No federated JWT” error in your Amplify Gen 2 project? Do you feel like pulling your hair out every time you see this error message? Worry no more, dear developer! In this comprehensive guide, we’ll walk you through the process of resolving this pesky error and get your lambda function up and running in no time.

What Causes the “No Federated JWT” Error?

Before we dive into the solution, it’s essential to understand the root cause of this error. The “No federated JWT” error occurs when your lambda function is unable to authenticate with the Amplify Gen 2 API. This can happen due to various reasons, including:

• Incorrectly configured AWS IAM roles and permissions
• Mismatched or missing AWS_REGION and AWS_ACCESS_KEY_ID environment variables
• Incorrect or expired AWS credentials
• Invalid or missing JWT token in the authorization header

Step 1: Verify Your AWS IAM Roles and Permissions

The first step in resolving the “No federated JWT” error is to ensure that your AWS IAM roles and permissions are correctly configured. Follow these steps to verify your IAM setup:

1. Log in to the AWS Management Console and navigate to the IAM dashboard.
2. Click on “Roles” and select the role associated with your lambda function.
3. Click on the “Permissions” tab and ensure that the role has the necessary permissions to execute your lambda function.
4. Check if the role has the “execute-api” permission on the API Gateway.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "AllowAPICalls",
      "Effect": "Allow",
      "Action": "execute-api:Invoke",
      "Resource": "arn:aws:execute-api:REGION:ACCOUNT_ID:API_ID/*"
    }
  ]
}

Step 2: Configure Your Lambda Function Environment Variables

The next step is to ensure that your lambda function environment variables are correctly configured. Follow these steps to set up your environment variables:

1. In the AWS Lambda console, click on your lambda function and navigate to the “Configuration” tab.
2. Click on “Environment variables” and add the following variables:

Variable Name	Value
AWS_REGION	Your AWS region (e.g., us-east-1)
AWS_ACCESS_KEY_ID	Your AWS access key ID
AWS_SECRET_ACCESS_KEY	Your AWS secret access key

Step 3: Verify Your AWS Credentials

Ensuring that your AWS credentials are correct and up-to-date is crucial for resolving the “No federated JWT” error. Follow these steps to verify your AWS credentials:

1. Check if your AWS access key ID and secret access key are correct and not expired.
2. Verify that your AWS credentials are properly configured in your AWS CLI or SDK.

aws sts get-caller-identity

Step 4: Verify Your JWT Token

The final step is to ensure that your JWT token is valid and correctly configured. Follow these steps to verify your JWT token:

1. In your lambda function, verify that the authorization header contains a valid JWT token.
2. Check if the JWT token is correctly signed and verified by your lambda function.

const jwtToken = event.headers.Authorization;
const decodedToken = jwt.verify(jwtToken, process.env.ISSUER_KEY);

Conclusion

In conclusion, resolving the “No federated JWT” error in Amplify Gen 2 requires careful attention to detail and a thorough understanding of the underlying causes. By following the steps outlined in this guide, you should be able to resolve this error and get your lambda function up and running in no time. Remember to:

• Verify your AWS IAM roles and permissions
• Configure your lambda function environment variables
• Verify your AWS credentials
• Verify your JWT token

By following these steps and taking the necessary precautions, you’ll be well on your way to resolving the “No federated JWT” error and building a robust and secure Amplify Gen 2 project. Happy coding!

Frequently Asked Question

Stuck with the “No federated JWT” error in your Amplify Gen 2 lambda function? We’ve got you covered! Check out these FAQs to troubleshoot the issue and get your app up and running smoothly.