# Overview

The Expression Editor is used for creating and editing expressions, which you can use to make simple or complex transformations to the data; filter incoming records; do conditional tests; and many other actions.

For information about expressions inInaport see Expressions.

### Expression Bar

The expression bar at top is where you type the expression. In several places in the editor, if you double click then relevant expression parts are inserted into the bar.

When a field name is used in an expression, it is preceded with a '#', like this: #MyField. If the field name has spaces or other non-alphanumeric characters in it, it is also surrounded with '[]', like this: #[My Field]

### Preview Record

The grid at left shows an incoming record, with field names and (normally) field values. You can double click on a field to insert it into the expression. If you click in the 'Field name' header, the grid is sorted alphabetically.

### Test Button (at the bottom)

When you have built an expression, click the "Test" button to apply the expression to the record shown in the Preview. This will show you the result, or let you know if there is an error.

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