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Set Payload Transformer

The Set Payload (set-payload) component lets you update the payload of the message. The payload can be a literal string or a DataWeave expression. The set-payload component, however, is not recommended for complex expressions or transformations but rather, simple ones, such as selections. You should use Transform Message Component for complex scenarios.

Field Usage Description

Value (value)


Accepts a literal string or DataWeave expression that defines how to set the payload, for example, "some string" or #[now()].

Mime Type (mimeType)


The mime type of the value assigned to the payload, for example, text/plain or application/json.

Encoding (encoding)


The encoding of the value assigned to the payload, for example, UTF-8.

The mimeType and encoding attributes will not affect a DataWeave expression used as value. They only affect the output Mule Message. If a transformation is required, the DataWeave expression must contain an explicit output directive.

This XML example sets a payload with static values:

Static Content Example:
<set-payload value="{ 'name' : 'Ana', 'office' : 'BA' }" mimeType="application/json" encoding="UTF-8"/>

The next example sets the message payload to "Hello, World" appending today’s date using a DataWeave expression: #['Hello World!' ++ ' Today is ' ++ now()]

Expression Content Example:
<set-payload value="#['Hello World!' ++ ' Today is ' ++ now()]"/>