How to fix Error: Error creating Lambda function: InvalidParameterValueException in Terraform

What this error means

When Terraform attempts to create a Lambda function via the AWS API, AWS validates all provided parameters. The InvalidParameterValueException error indicates that at least one parameter value fails validation for the CreateFunction operation. Unlike syntax errors in Terraform itself, this error comes from AWS rejecting the configuration during the actual function creation. The root cause requires examining the specific error message alongside your Terraform configuration to identify which parameter AWS deemed invalid.

Typical symptoms

• terraform apply fails with "InvalidParameterValueException"
• Error message includes specific parameter name (e.g., MemorySize, Runtime)
• Creation works in AWS console but fails with Terraform
• Error occurs immediately when applying Terraform changes
• Works locally but fails in CI/CD pipeline
• Specific error about S3 bucket region or network interface permissions
• Error mentioning quotas or limits exceeded

Common causes

1. S3 bucket containing Lambda code is in a different region than the Lambda function
2. IAM execution role missing required permissions for VPC configuration
3. Memory size outside valid range (128 MB to 10,240 MB, in 1 MB increments)
4. Runtime version is unsupported or deprecated (e.g., Python 2.7, Node.js 10.x)
5. Handler format is incorrect for the specified runtime
6. Timeout exceeds maximum allowed value (900 seconds) or is below 1 second
7. Environment variables exceed 4 KB size limit
8. Combined function code and Lambda layers exceed 262 MB size limit
9. Invalid IAM role ARN or role does not exist
10. VPC configuration with invalid subnet IDs or security group IDs
11. Architecture specified is neither x86_64 nor arm64
12. Attempting to add permissions to $LATEST unpublished version
13. Provisioned concurrency combined with weighted alias for canary deployment
14. Function creation happening before IAM role has propagated through AWS

How to fix "Error: Error creating Lambda function: InvalidParameterValueException"

resource "aws_lambda_function" "example" {
  filename = "lambda.zip"
  s3_bucket = "my-bucket"  # This bucket must be in same region as function
  s3_key    = "deployments/lambda.zip"

  region = "us-east-1"  # Lambda region
}

aws s3api get-bucket-location --bucket my-bucket --region us-east-1

resource "aws_lambda_function" "example" {
  runtime = "python3.12"  # Make sure this is supported
}

resource "aws_lambda_function" "example" {
  memory_size = 256   # Must be 128-10240 MB, in 1 MB increments
  timeout     = 30    # Must be 1-900 seconds
}

handler = "lambda_function.handler"  # file.function_name

handler = "index.handler"  # file.function_name

handler = "main"  # Binary name in ZIP root

handler = "com.example.App::handleRequest"  # class::method

resource "aws_iam_role" "lambda_role" {
  assume_role_policy = jsonencode({
    Version = "2012-10-17"
    Statement = [{
      Action = "sts:AssumeRole"
      Effect = "Allow"
      Principal = {
        Service = "lambda.amazonaws.com"
      }
    }]
  })
}

resource "aws_iam_role_policy_attachment" "lambda_vpc_policy" {
  role       = aws_iam_role.lambda_role.name
  policy_arn = "arn:aws:iam::aws:policy/service-role/AWSLambdaVPCAccessExecutionRole"
}

resource "aws_lambda_function" "example" {
  role             = aws_iam_role.lambda_role.arn
  vpc_config {
    subnet_ids         = [aws_subnet.example.id]
    security_group_ids = [aws_security_group.example.id]
  }
}

# Calculate size of your environment variables
echo -n "KEY1=value1KEY2=value2KEY3=value3" | wc -c

resource "aws_lambda_function" "example" {
  # Use parameters from AWS Systems Manager instead of env vars
  environment {
    variables = {
      SECRETS_ARN = aws_secretsmanager_secret.example.arn
    }
  }
}

# Check uncompressed size
unzip -l lambda.zip | tail -1

# Check compressed size
ls -lh lambda.zip

resource "aws_lambda_function" "example" {
  # Option 1: Remove unused dependencies
  filename = "lambda-slim.zip"

  # Option 2: Use Lambda layers for common libraries
  layers = [aws_lambda_layer_version.dependencies.arn]
}

resource "aws_lambda_function" "example" {
  publish = true  # Creates a versioned function instead of $LATEST only
}

resource "aws_lambda_permission" "example" {
  statement_id  = "AllowAPIGateway"
  action        = "lambda:InvokeFunction"
  function_name = aws_lambda_function.example.function_name
  principal     = "apigateway.amazonaws.com"
}

resource "time_sleep" "wait_for_iam_propagation" {
  create_duration = "10s"

  depends_on = [
    aws_iam_role_policy_attachment.lambda_policy
  ]
}

resource "aws_lambda_function" "example" {
  role = aws_iam_role.lambda_role.arn

  depends_on = [
    time_sleep.wait_for_iam_propagation
  ]
}

Advanced notes

Frequently asked questions

What does "Error: Error creating Lambda function: InvalidParameterValueException" mean?

When Terraform attempts to create a Lambda function via the AWS API, AWS validates all provided parameters. The InvalidParameterValueException error indicates that at least one parameter value fails validation for the CreateFunction operation. Unlike syntax errors in Terraform itself, this error comes from AWS rejecting the configuration during the actual function creation.

How do I fix "Error: Error creating Lambda function: InvalidParameterValueException"?

The "InvalidParameterValueException" error occurs when creating AWS Lambda functions with Terraform due to invalid configuration parameters. Common causes include S3 bucket region mismatches, VPC permission issues, IAM role problems, or exceeding service quotas.

What causes "Error: Error creating Lambda function: InvalidParameterValueException"?

S3 bucket containing Lambda code is in a different region than the Lambda function IAM execution role missing required permissions for VPC configuration Memory size outside valid range (128 MB to 10,240 MB, in 1 MB increments)

Is the "Error: Error creating Lambda function: InvalidParameterValueException" error serious?

It is a medium-severity error — more of a blocker than a risk. The steps above resolve it.

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Official resources & further reading

• 📚Terraform Official Documentation
• 📖
  AWS Lambda: Troubleshoot deployment issues(Official Docs)
• 📖
  AWS Lambda CreateFunction API Documentation(Official Docs)
• 🐙
  Terraform AWS Provider: InvalidParameterValueException timing issues(GitHub)
• ControlMonkey: How to Troubleshoot Terraform on AWS