AWS AppSync JavaScript runtime features for resolvers and functions

Supported runtime features - Learn more about supported core features, primitive objects, built-in objects and functions, etc.

Built-in utilities - The util variable contains general utility methods to help you work with data. Unless otherwise specified, all utilities use the UTF-8 character set.

Built-in modules - Learn more about how built-in modules can help write JavaScript resolvers and functions.

Runtime utilities - The runtime library provides utilities to control or modify the runtime properties of your resolvers and functions.

Time helpers in util.time - The util.time variable contains datetime methods to help generate timestamps, convert between datetime formats, and parse datetime strings. The syntax for datetime formats is based on DateTimeFormatter, which you can reference for further documentation.

DynamoDB helpers in util.dynamodb - util.dynamodb contains helper methods that make it easier to write and read data to Amazon DynamoDB, such as automatic type mapping and formatting.

HTTP helpers in util.http - The util.http utility provides helper methods that you can use to manage HTTP request parameters and to add response headers.

Transformation helpers in util.transform - util.transform contains helper methods that make it easier to perform complex operations against data sources.

String helpers in util.str - util.str contains methods to help with common String operations.

Extensions - extensions contains a set of methods to make additional actions within your resolvers.

XML helpers in util.xml - util.xml contains methods to help with XML string conversion.