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Common Contexts
The following table lists a number of supported common contexts for retrieving, manipulating, and setting data within a flow.
msg
This selects part of the incoming message as the source of the data. This is the typical choice.

flow
This selects part of the flow context's saved data as the source. This information is shared with only the nodes on a given tab.

global
This selects part of the global context's saved data as the source. This information is shared by all nodes regardless of tab.

J:expression
JSON data expression language to perform query and transform operations on the payload.
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