Docs / Concepts / Variables

Using Variables in LPS

Variables enhance the flexibility of test scenarios by allowing dynamic data to be injected into requests. They can be predefined or generated during the test and are useful for:

  • Storing values captured from responses.
  • Referencing external data sources like CSV files or JSON configurations.
  • Creating parameterized test cases.
  • Building dynamic requests using runtime values.

To use a defined variable, prefix it with $ or use ${} for complex placeholders.

For example:

${csvData[0,$counter(start=0, reset=10)]}

Example

name: variablesTest
variables:
- name: responseTime
  value: $randomnumber(min=100, max=500)
rounds:
- name: VariableExampleRound
  numberOfClients: 2
  arrivalDelay: 5000
  iterations:
  - name: UseVariable
    mode: R
    requestCount: 200
    httpRequest:
      url: https://example.com/resource/$responseTime
      httpMethod: GET

Variable Types

String Family

String, QString, Json, QJson, Xml, QXml, Csv, QCsv

Note: Q* types return quoted values for safe string comparisons.

Numeric Types

Int, Float, Double, Decimal

Boolean

Boolean - true/false values

You can also attach an optional regex to validate or filter the value after it is assigned.

Resolution Order

Variables are resolved in the following order: Session → Global.

Session variables take precedence over global variables with the same name.