What are built-in functions in JMeter?

Built-in functions are functions provided by JMeter that allows you access JMeter/JVM properties, manipulate data, and run scripts.

Below is the syntax of calling a built-in function.

${__functionName(param1,param2,param3)}

Note that if a parameter contains a ",", it must be escaped as "\,". For example: the following function returns 5:

${__javaScript(Math.max(2\,5))}

List of some commonly used built-in functions:

• __machineName() - Returns the local machine name.
• __time() - Returns time formatted with a given pattern.
• __log() - Logs a message.
• __StringFromFile() - Reads a line from a file.
• __FileToString() - Reads file contents.
• __CSVRead() - Reads a file in CSV format.
• __XPath() - Extract data with an XPath from an XML file.
• __intSum() - Adds two integers.
• __longSum() - Add two long integers.
• __Random() - Generates a random number.
• __RandomDate() - Generates a random date.
• __RandomString() - Generates a random string.
• __groovy() - Runs a Groovy script.
• __javaScript() - Generates an JavaScript code.
• __property() - Runs the value of a given JMeter/JVM property.
• __P() - Same as __property().
• __setProperty() - Sets new value to a JMeter property.
• __split() - Splits a string with a given delimiter.
• __regexFunction() - Parses the output with a regular expression.
• __char() - Generates a Unicode character.
• __unescape() - Un-escape a Java encoded string.
• __unescapeHtml() - Un-escape an HTML string.
• __escapeHtml - Escape an HTML string.
• __escapeXml() - Escape an XML string.
• __urldecode() - Decodes a URL encoded string.
• __urlencode() - Encodes a URL string.
• __TestName() - Returns the file name of the test plan.

⇒ JMeter Test Elements and Execution Order

⇐ System Properties in JMeter

⇑ Variables and Functions in JMeter

⇑⇑ Apache JMeter Tutorials