Reference > Functions reference > Logical functions > IsValid


Returns 0 (false) if the data is invalid; otherwise, returns 1 (true).




field - any field name

Data type returned 


Originated in 

FileMaker Pro 6.0 or earlier


Returns 0 (False) if:

A field contains an invalid value because of a field type mismatch (text in a date field, for example)

FileMaker Pro Advanced cannot locate (temporarily or permanently) the related table in which the referenced field is defined

A field has been deleted from a related table, and therefore the references to that field in the source table are invalid

Otherwise, it returns 1 (the data is valid).


IsValid does not check field validation options defined in the Manage Database dialog box. Define field validation options to make sure that data is correctly entered into fields during data entry and import. See Defining field validation.

Example 1 

IsValid(Datefield) returns 0 if there is non-date data in Datefield, for example if text was imported into it.

Example 2 

IsValid(Amount) returns 0 if there is only text in the number field Amount.

Example 3 

IsValid(table::field) returns 0 if the related table was renamed and the relationship isn’t updated with the new filename.

Related topics 

Functions reference (category list)

Functions reference (alphabetical list)

About formulas

About functions

Defining calculation fields

Using operators in formulas