# Event API runtime reference
<a name="runtime-reference"></a>



The following sections contain the `APPSYNC_JS` runtime reference:
+ [Runtime reference overview](runtime-reference-overview.md) — Learn more about how runtime data sources work in AWS AppSync Events.
+ [Context reference](context-reference.md) — Learn more about the context object and how it's used in AWS AppSync Events handlers.
+  [Runtime features](runtime-features-overview.md) — Learn more about supported runtime features.
+  [Runtime reference for DynamoDB](dynamodb-function-reference.md) — Learn more about how AWS AppSync Events handlers interact with DynamoDB.
+  [Runtime reference for OpenSearch Service](opensearch-function-reference.md) — Learn more about how AWS AppSync Events handlers interact with Amazon OpenSearch Service. 
+  [Runtime reference for Lambda](lambda-function-reference.md) — Learn more about how AWS AppSync Events API handlers interact with AWS Lambda.
+  [Runtime reference for EventBridge](eventbridge-function-reference.md) — Learn more about how AWS AppSync Events API handlers interact with Amazon EventBridge.
+  [Runtime reference for HTTP](http-function-reference.md) — Learn more about how AWS AppSync Events API handlers interact with HTTP endpoints.
+  [Runtime reference for Amazon RDS](rds-function-reference.md) — Learn more about how AWS AppSync Events API handlers interact with Amazon Relational Database Service.
+  [Runtime reference for Amazon Bedrock](bedrock-function-reference.md) — Learn more about how how AWS AppSync Events API handlers interact with Amazon Bedrock.