DataWeave Language

DataWeave is the MuleSoft expression language for accessing and transforming data that travels through a Mule app. DataWeave is tightly integrated with the Mule runtime engine, which runs the scripts and expressions in your Mule app.

DataWeave scripts act on data in the Mule event. Most commonly, you use it to access and transform data in the message payload. For example, after a component in your app retrieves data from one system, you can use DataWeave to modify and output selected fields in that data to a new data format, then use another component in your app to pass on that data to another system.

You write DataWeave expressions and scripts within message processors (components, connectors, or modules) when creating apps in Anypoint Studio or Design Center, or as handwritten XML configuration files.

The Mule 4.2 release supports DataWeave 2.2.0, which introduces a number of functions, types, and annotations that are not supported by Mule 4.1. Within the DataWeave Reference, these items are tagged with the following text: Introduced in DataWeave 2.2.0. Supported by Mule 4.2 and later.

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