See examples here in README
Precisely as below for UUID
(you can use ${RANDOM.NUMBER} too)-
{
"scenarioName": "random_UUID",
"steps": [
{
"name": "create_new_employee",
"url": "http://localhost:9998/google-emp-services/home/employees",
"operation": "POST",
"request": {
"body": {
"id": "${RANDOM.UUID}", //<-- Everytime it creates unique uuid. See below example.
"name": "Elen M"
}
},
"assertions": {
"status": 201
}
}
]
}