DataWeave 2.1 is compatible with Mule 4.1. Standard Support for Mule 4.1 ended on November 2, 2020, and this version of Mule will reach its End of Life on November 2, 2022, when Extended Support ends.

Deployments of new applications to CloudHub that use this version of Mule are no longer allowed. Only in-place updates to applications are permitted.

MuleSoft recommends that you upgrade to the latest version of Mule 4 that is in Standard Support so that your applications run with the latest fixes and security enhancements.

read(String | Binary, String, Object)

Reads the input string or binary and returns parsed content.

This function can be useful if the reader cannot determine the content type by default.


Name Description


The string or binary to read.


A supported format (or content type). Default: application/dw.


Optional: Sets reader configuration properties. For other formats and reader configuration properties, see DataWeave Output Formats and Writer Properties.


This example reads a string as a CSV format without a header and outputs it to JSON. Notice that is adds column names as keys to the output object. Also, if you do not append [0] to the function call, the results will return as an array (with square brackets surrounding the entire output object).


%dw 2.0
var myVar = "Some, Body"
output application/json


  "column_0": "Some",
  "column_1": " Body"


This example reads the input XML and shows the syntax for a reader property.


%dw 2.0
output application/xml
   "XML" : read("<prices><basic>9.99</basic></prices>",
                { indexedReader: "false" })."prices"


<?xml version='1.0' encoding='UTF-8'?>

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