Warning! This page documents an old version of Kapacitor, which is no longer actively developed. Kapacitor v1.4 is the most recent stable version of Kapacitor.



Boolean literals are the keywords TRUE and FALSE. They are case sensitive.


Numbers are typed and are either a float64 or an int64. If the number contains a decimal it is considered to be a float64 otherwise it is an int64. All numbers are considered to be base 10 numbers.

Valid number literals:

  • 1 – int64
  • 1.2 – float64
  • 5 – int64
  • 5.0 – float64
  • 0.42 – float64

Invalid number literals:

  • .1 – decimals must have a leading zero


There are two ways to write string literals:

1. Single quoted strings with backslash escaped single quotes.

This string `'single \' quoted'` becomes the literal `single ' quoted`.

2. Triple single quoted strings with no escaping.

This string `'''triple \' quoted'''` becomes the literal `triple \' quoted`.


TICKscript supports durations literals. They are of the form of an InfluxQL duration literals. See

Duration literals specify a length of time. An integer literal followed immediately (with no spaces) by a duration unit listed below is interpreted as a duration literal.

Duration unit definitions

Units Meaning
u or ยต microseconds (1 millionth of a second)
ms milliseconds (1 thousandth of a second)
s second
m minute
h hour
d day
w week


A statement begins with an identifier and any number of chaining function calls. The result of a statement can be assigned to a variable using the var keyword and assignment operator =.


    var errors = stream.from().measurement('errors')
    var requests = stream.from().measurement('requests')
    // Join the errors and requests stream
            .as('errors', 'requests')
        .eval(lambda: "errors.value" / "requests.value")



Whitespace is ignored and can be used to format the code as you like.

Typically property methods are indented in from their calling node. This way methods along the left edge are chaining methods.

For example:

   .eval(lambda: "views" + "errors")
       .as('total_views') // Increase indent for property method.
.httpOut('example') // Decrease indent for chaining method.


Basic // style single line comments are supported.