{"id":"apigw-websocket-route-selection-expression-api-level","text":"The WebSocket API route selection expression is defined at the API level (not per-route) and specifies which JSON property in the message payload determines routing (e.g., `${request.body.action}`).","truth_value":"IN","source":"entries/2026/03/11/apigateway-latest-developerguide-apigateway-websocket-api-overviewhtml.md","source_url":"","source_hash":"af38591465566714","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"apigw-websocket-route-selection-expression-api-level","truth_value":"IN","reason":"premise"}]}}