Use the expression builder to create expressions and test the results of those expressions. You can also use expressions to manipulate data, concatenate strings, and build arrays. To start the expression builder, click the gears icon on the attribute mapping page. For more information, see Mapping attributes.
- Enter an expression that identifies the attribute you want to map.
- To verify an expression and see sample data, click Test expression.
- To toggle between expression values and JSON, click Edit JSON or Edit values.
- For sample expressions and reference information, click View documentation.