Script block
The "Script" block allows you to execute Javascript code. If you want to set a variable value with Javascript, use the Set variable block instead. You can't set a variable with the script block.
It doesn't allow you to create a custom visual block
note
Variables in script are not parsed, they are evaluated. So it should be treated as if it were real javascript variables.
You need to write console.log({{My variable}})
instead of console.log("{{My variable}}")
Examples
Reload page
window.location.reload()
Redirect if a variable has a specific value
if({{Category}} === 'qualified') {
window.location.href = 'https://my-site.com'
}