Are Lambda environment variables encrypted by default?

Yes. AWS encrypts Lambda environment variables at rest using an AWS-managed KMS key at no additional cost. Using a customer-managed KMS key gives you additional control, including the ability to rotate keys and audit key usage, but incurs KMS API call costs.

Should I use Lambda environment variables or AWS Secrets Manager for secrets?

For simple configuration values and non-rotating secrets, encrypted environment variables work well. For secrets that need automatic rotation, cross-service sharing, or fine-grained audit trails, AWS Secrets Manager is the better choice despite its higher cost.

AWS Lambda Environment Variable Encryptor

ServerlessAWS

Encode and decode Lambda environment variable payloads with key-value validation.

Lambda Configuration

Encode and decode Lambda environment variable payloads with key-value validation.

Required Fields

functionNamekmsKeyArnvariablesvariables.STAGE

Generated Output

Output will appear here...

About This Tool

The Lambda Environment Variable Encryptor helps you prepare encrypted environment variable configurations for AWS Lambda functions. Lambda environment variables are encrypted at rest by default with an AWS-managed key, but you can use a customer-managed KMS key for additional control. This tool guides you through configuring KMS-encrypted environment variables, generates the proper Lambda configuration JSON, and shows the decryption code snippets for your runtime so you can securely handle secrets in your functions.

When to Use This Tool

•Configure Lambda environment variables with a customer-managed KMS key for compliance requirements that mandate bring-your-own-key encryption.
•Generate decryption code snippets for Node.js, Python, and other runtimes to decrypt KMS-encrypted environment variables at function startup.
•Plan environment variable encryption strategies for Lambda functions that handle sensitive data like API keys or database credentials.
•Understand the differences between default Lambda encryption, KMS encryption helpers, and dedicated secrets management services.

Frequently Asked Questions

Are Lambda environment variables encrypted by default?: Yes. AWS encrypts Lambda environment variables at rest using an AWS-managed KMS key at no additional cost. Using a customer-managed KMS key gives you additional control, including the ability to rotate keys and audit key usage, but incurs KMS API call costs.
Should I use Lambda environment variables or AWS Secrets Manager for secrets?: For simple configuration values and non-rotating secrets, encrypted environment variables work well. For secrets that need automatic rotation, cross-service sharing, or fine-grained audit trails, AWS Secrets Manager is the better choice despite its higher cost.

Related Learning Guides

Lambda Performance Tuning26 min read
AWS IAM Best Practices25 min read

Disclaimer: This tool runs entirely in your browser. No data is sent to our servers. Always verify outputs before using them in production. AWS, Azure, and GCP are trademarks of their respective owners.

AWS Lambda Environment Variable Encryptor

ServerlessAWS

Encode and decode Lambda environment variable payloads with key-value validation.

Lambda Configuration

Encode and decode Lambda environment variable payloads with key-value validation.

Required Fields

functionNamekmsKeyArnvariablesvariables.STAGE

Generated Output

Output will appear here...

About This Tool

When to Use This Tool

•Configure Lambda environment variables with a customer-managed KMS key for compliance requirements that mandate bring-your-own-key encryption.
•Generate decryption code snippets for Node.js, Python, and other runtimes to decrypt KMS-encrypted environment variables at function startup.
•Plan environment variable encryption strategies for Lambda functions that handle sensitive data like API keys or database credentials.
•Understand the differences between default Lambda encryption, KMS encryption helpers, and dedicated secrets management services.

Frequently Asked Questions

Are Lambda environment variables encrypted by default?: Yes. AWS encrypts Lambda environment variables at rest using an AWS-managed KMS key at no additional cost. Using a customer-managed KMS key gives you additional control, including the ability to rotate keys and audit key usage, but incurs KMS API call costs.
Should I use Lambda environment variables or AWS Secrets Manager for secrets?: For simple configuration values and non-rotating secrets, encrypted environment variables work well. For secrets that need automatic rotation, cross-service sharing, or fine-grained audit trails, AWS Secrets Manager is the better choice despite its higher cost.

Related Learning Guides

Lambda Performance Tuning26 min read
AWS IAM Best Practices25 min read