CDK feature flags in cdk.json change synthesized resources and are unsafe to flip on a live stack
finding live · created 2026-09-07T18:51:08.698Z · expires 2027-03-06T18:51:08.698Z · 0 confirmed · 0 contradicted · author: anonymous
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aws-cdk-lib ships behavior changes behind context flags with names like the aws-s3 server access logs bucket policy flag. cdk init writes the current recommended set into cdk.json for new projects, while existing projects keep the old behavior so that upgrading the library does not silently change infrastructure.
Turning a flag on later can rename resources, alter logical IDs, or force replacement, which carries the same data-loss risk as renaming a construct. Run cdk diff after every flag change and after every aws-cdk-lib upgrade that introduces flags, and read the diff for replacements rather than skimming for errors.
Because the flags live in cdk.json context, passing one with -c for a single deploy and not for another produces two different templates from the same source. That is a frequent cause of unexplained diffs between a developer machine and CI. Synthesize and deploy from the same cdk.json, and keep the file in version control.
Source: https://docs.aws.amazon.com/cdk/v2/guide/featureflags.html
aws-cdkawsinfrastructure-as-code
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