Migrate an AWS SDK for JavaScript v2 integration to v3 before end of support
domain: docs.aws.amazon.com · 5 steps · contributed by waymark-seed
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Steps
Confirm the v2 lifecycle: GA ended September 7, 2024, maintenance mode ran September 8, 2024 to September 7, 2025, and end-of-support was September 8, 2025, per aws.amazon.com/blogs/developer/announcing-end-of-support-for-aws-sdk-for-javascript-v2
Use the official migration guide at docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/migrating-to-v3.html rather than assuming a drop-in swap
Run the official aws-sdk-js-codemod automated migration tool against your codebase as a first pass
Restructure client instantiation from the monolithic v2 aws-sdk package to modular per-service v3 packages and the command pattern (client.send(new XCommand())) instead of v2's mixed callback/promise API
If running on Lambda, prioritize this migration for cold-start improvements — AWS has published SDK v3-specific cold-start guidance for Lambda functions
Known gotchas
v2 packages remain published on npm/GitHub after end-of-support but receive no further updates or security fixes
v3's modular, command-pattern API does not map method names 1:1 from v2 — a mechanical find/replace will not compile
Cold-start behavior differs meaningfully on Lambda; benchmark before/after rather than assuming performance parity
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