Amazon CloudFront KeyValueStore - Amazon CloudFront

Amazon CloudFront KeyValueStore

CloudFront KeyValueStore is a secure, global, low-latency key value datastore that allows read access from within CloudFront Functions, enabling advanced customizable logic at the CloudFront edge locations.

With CloudFront KeyValueStore, you make updates to function code and updates to the data associated with a function independently of each other. This separation simplifies function code and makes it easy to update data without the need to deploy code changes.


To use CloudFront KeyValueStore, your CloudFront function must use JavaScript runtime 2.0.

The following is the general procedure for using key-value pairs:

  • Create key value stores, and populate it with a set of key-value pairs. You can add your key value stores to an Amazon S3 bucket or enter them manually.

  • Associate the key value stores with your CloudFront function.

  • Within your function code, use the name of the key to either retrieve the value associated with the key or to evaluate if a key exists. For more information about using key-value pairs in function code, and about helper methods, see Helper methods for key value stores.

Use cases

You can use key-value pairs for the following examples:

  • URL rewrites or redirects – The key-value pair can hold the rewritten URLs or the redirect URLs.

  • A/B testing and feature flags – You can create a function to run experiments by assigning a percentage of traffic to a specific version of your website.

  • Access authorization – You can implement access control to allow or deny requests based on criteria defined by you and the data stored in a key value store.

Supported formats for values

You can store the value in a key-value pair in any of the following formats:

  • String

  • Byte-encoded string

  • JSON


The CloudFront function and all its key value stores data are handled securely, as follows:

  • CloudFront encrypts each key value stores at rest and during transit (when reading or writing to the key value stores) when you call the CloudFront KeyValueStore API operations.

  • When the function is run, CloudFront decrypts each key-value pair in memory at the CloudFront edge locations.

To get started with CloudFront KeyValueStore, see the following topics.