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AWS Lambda (sdk) InvalidZipFileException

The uploaded ZIP file for the Lambda function code is invalid or corrupted.

Understanding AWS Lambda

AWS Lambda is a serverless compute service that allows you to run code without provisioning or managing servers. It executes your code only when needed and scales automatically, from a few requests per day to thousands per second. Lambda is designed to handle various tasks, such as data processing, real-time file processing, and backend services.

Identifying the Symptom: InvalidZipFileException

When deploying a Lambda function, you might encounter the InvalidZipFileException. This error indicates that the ZIP file uploaded for the Lambda function code is either invalid or corrupted. This can prevent your function from being deployed or executed properly.

Common Error Message

The error message typically reads: "The uploaded ZIP file is invalid or corrupted." This message appears during the deployment process when the Lambda service attempts to extract and validate the contents of the ZIP file.

Exploring the Issue: Why Does This Happen?

The InvalidZipFileException occurs when the ZIP file does not meet the required format or is corrupted during the upload process. This can happen due to several reasons, such as improper file compression, file corruption during transfer, or using unsupported file types within the ZIP.

Potential Causes

  • Incorrect file compression method used.
  • Corruption during file transfer.
  • Inclusion of unsupported file types or structures.

Steps to Fix the InvalidZipFileException

To resolve the InvalidZipFileException, follow these steps:

Step 1: Verify the ZIP File Format

Ensure that the ZIP file is created using a standard compression tool and format. Use tools like 7-Zip or the built-in compression utility on your operating system to create the ZIP file.

Step 2: Check for Corruption

Verify the integrity of the ZIP file by extracting it locally. If the extraction fails, recreate the ZIP file and try uploading it again. Ensure that the file size does not exceed the Lambda deployment package size limits.

Step 3: Validate File Contents

Ensure that the ZIP file contains only the necessary files and directories for your Lambda function. Avoid including unnecessary files or directories that might cause issues during extraction.

Step 4: Re-upload the ZIP File

After verifying and correcting the ZIP file, re-upload it to AWS Lambda. You can use the AWS Management Console, AWS CLI, or AWS SDKs to upload the file. For example, using the AWS CLI:

aws lambda update-function-code --function-name YourFunctionName --zip-file fileb://path/to/your/file.zip

Conclusion

By following these steps, you should be able to resolve the InvalidZipFileException and successfully deploy your AWS Lambda function. For more detailed guidance, refer to the AWS Lambda Developer Guide.

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