__RandomString

Also documented in context in the full Functions and Variables reference.

TL;DR: __RandomString generates a random string of a given length, optionally from a specific character set — handy for unique-ish usernames, search terms, or filler payload data.

The RandomString function returns a random String of length using characters in chars to use.

Name	Required	Description
Length	Yes	A number length of generated String
Characters to use	No	Chars used to generate String
Variable Name	No	A reference name for reusing the value computed by this function.

Examples:

\${__RandomString(5)}

will return a random string of 5 characters which can be readable or not

\${__RandomString(10,abcdefg)}

will return a random string of 10 characters picked from abcdefg set, like cdbgdbeebd or adbfeggfad, …

\${__RandomString(6,a12zeczclk, MYVAR)}

will return a random string of 6 characters picked from a12zeczclk set and store the result in MYVAR, MYVAR will contain string like 2z22ak or z11kce, …

Example

${__RandomString(5)}                     → random 5-char string
${__RandomString(10,abcdefg)}            → 10 chars from "abcdefg" only
${__RandomString(6,a12zeczclk,myVar)}    → stored in variable "myVar" too

Not cryptographically random — don’t use this to generate anything security-sensitive (tokens, secrets). For unique IDs instead of random noise, see __UUID.

Related

• Functions and Variables Guide
• Regex Extractor Builder
• CSV Data Set & Parameterization
• Full Functions Reference
• Component Reference