---
title: "Store JavaScript Variable and Data for Use in a Transaction Test"
slug: "store-javascript-variable-and-data-for-use-in-a-transaction-test"
updated: 2023-01-06T15:48:57Z
published: 2023-01-06T15:48:57Z
canonical: "docs.catchpoint.com/store-javascript-variable-and-data-for-use-in-a-transaction-test"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.catchpoint.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Store JavaScript Variable and Data for Use in a Transaction Test

Catchpoint Transaction tests use [Selenium variables](https://docs.catchpoint.com/docs/Variables-in-Transaction-Tests) to store JavaScript data through the `storeScriptVariable()` command.

The `storeScriptVariable()` command saves the value returned from executed JavaScript into a Selenium variable. This can be used to create metrics out of the custom performance mark times for a given page. This is available for Transaction tests using the Chrome monitor.

**Syntax:** `storeScriptVariable(name, script)`

**Best Practices:** It is recommended that the script called is a single function with a return or a single variable only. If additional JavaScript needs to be injected and executed to initialize the function or variable, it is recommended to use the **[runScript()](https://docs.catchpoint.com/docs/Transaction-Test-Type)** command to perform the injection. The `storeScriptVariable()` should only execute JavaScript functions that have been defined on the page or have been injected with the **[runScript()](https://docs.catchpoint.com/docs/Transaction-Test-Type)** command.

**Example:**

```
//Open a page to execute JS on
open("http://www.google.com")

//Create a JS function that returns 'point'
runScript("function bar(){return 'point';}")

//Create a variable the concatenates strings and then stores 'catchpoint'
runScript("var foo='catch' + bar();")

//store JS data into Selenium variable (The second parameter cannot be a JS expression)
storeScriptVariable("foobar","foo;")

//call the stored Selenium variable to verify its contents
open(https://www.google.com/?gws_rd=ssl#q=${var(foobar)})
```

***Note that this value can then be made into an insight using either "[setTracepoint](https://docs.catchpoint.com/docs/transaction-commands-and-macros)" or [setIndicator](https://docs.catchpoint.com/docs/transaction-commands-and-macros)".**

`setTracepoint(token, ${var(foobar)}) setIndicator(token, ${var(foobar)})`