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# System prepended metadata

title: AWS Lambda Execution Role
tags: [SAM, Lambda, AWS]

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# AWS Lambda Execution Role

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## The built-in AWSLambdaBasicExecutionRole

> …you can use the built-in `AWSLambdaBasicExecutionRole`, as these functions **don't call other AWS services**.

## Defining Lambda function permissions with an execution role

> If your Lambda function **calls other AWS services**, you'll need to assign an IAM execution role to the Lambda function.

## References

- [Use API Gateway Lambda authorizers » Additional examples of Lambda authorizer functions](https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-use-lambda-authorizer.html#api-gateway-lambda-authorizer-lambda-function-create)
- [Defining Lambda function permissions with an execution role](https://docs.aws.amazon.com/lambda/latest/dg/lambda-intro-execution-role.html)