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 FileMaker Pro Custom Functions

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PasswordCreator ( HowManyChars ; Parameter ; String )

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  Average rating: 4.4  (38 votes)
  Discuss this Custom Function

Martin D. Brunner, mdb

Calculate any lenght of random caracter string with the chars type you want

Sample Input:
PasswordCreator ( 8 ; 7; "")
Sample Output:

 Then copy & paste into FileMaker Advanced's Edit Custom Function window.


PasswordCreator ( HowManyChars ; Parameter ; String )

Recursive Custom Function programmed by Martin D. Brunner - 18. August 2008

Calculate any lenght of random caracter string with the chars type you want. This function is best used either in scripts or auto calcs.

Defines how many characters the string shall contain (a number you define)

Defines what kind of characters are used to calculate the string.
1 = lower case
2 = upper case
3 = numeric
4 = special chars
5 = lower & upper case
6 = Numeric & lower & uper case
7 = lower & upper case & numeric & special chars
8 = numeric & lower case
9 = upper case & numeric
10 = numeric & special chars

The String is the returned value. Set it in the beginning always to "" or you can also specify a prefix as i.e. "MA-" or the like.

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


This is a useful function but would be really nice if the password it generated had at least one character from each of the parameter categories.

Many systems REQUIRE a lowercase letter, an uppercase letter, a number, and a special character. This function is capable of creating a password to meet those requirements but there is no guarantee that it actually will because the character selection is purely random. It could for instance create a string of all lowercase letters even though parameter 7 was chosen.

Doug Larsen, Minneapolis
May 18, 2011 8:02am

I rewrote this to be:

// PasswordCreator ( PasswordLength ; CharsLowerCase ; CharsUpperCase ; CharsNumeric ; CharsSpecial ; String )


Counter = PasswordLength;
xSet = CharsLowerCase & CharsUpperCase & CharsNumeric & CharsSpecial;
xLen= Length(xSet)

Counter > 0; Let(String = String & Middle(xSet; Int(Random * xLen) + 1; 1); String) & CreateRandomPassword(Counter - 1; CharsLowerCase; CharsUpperCase; CharsNumeric; CharsSpecial; String);


I then specified the characters in a script with a loop that calls this function, which checks the actual generated password for the required characters. In my testing, a 4 digit password requiring at least 1 lower case, upper case, numeric and special character still ran very fast, even when it had to try 30+ times. This approach will guarantee that a generated password will meet the specifications that you want.

HazMatt, Blaine, MN, USA
June 13, 2013 4:33am

Make a comment about this Custom Function (please try to keep it brief & to the point). Anyone can post:

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characters left. If you paste in more than 1500 characters, it will be truncated. Discuss the function - advertisements and other useless posts will be deleted.
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