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# serverless → kittl-integration → authentication → jwt-verification → backend-sdk

1 link tagged with all of: serverless + kittl-integration + authentication + jwt-verification + backend-sdk

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SDK backend | Kittl SDK Documentation

@kittl/sdk-backend handles authentication on your server by verifying short-lived JWTs from Kittl users, keeping sensitive auth logic out of the browser sandbox. It gives you a `KittlSDK` class to validate tokens and optional external key storage for serverless/edge environments.
  • Frontend calls `kittl.auth.getUserToken()` to get a JWT, sends it to your backend, where `KittlSDK.verifyUserToken()` validates it before processing the request
  • Token verification returns `payload.sub`, a pseudonymous per-app user ID that stays consistent for each user across sessions
  • External signing key caching is required for serverless, edge, and autoscaling runtimes where in-memory caches don't persist between requests
Last saved Sep 02, 2026 · 1 min read
authentication jwt-verification backend-sdk serverless kittl-integration