Parameterized json payload

Grafana k6 OSS Support
1

How to parameterized the JSON payload for post requests with multiple variables. e.g. my JSON Is like as follow

{
  "oHeader": {
    "sReqType": "application/json",
    "sAppSource": "WEB 2.12.02",
    "sSourceID": "",
    "sAppID": "",
    "sProduct": "PL",
    "dtSubmit": "2020-09-28T16:09:47.574Z",
    "sCroId": "croID",
    "sDsaId": "dsaID",
    "sInstID": 4032,
    "sBranchCode": "5",
    "sLoginId": "loginId",
    "sLoginRole": "role",
    "instituteName": "Test",
    "sDealerId": "dealerID"
  },
  "sRefId": "refID", 
}

I need to parameterized login, loginRole , refID . I am switching from Gatling to k6 there in Gatling using session variable it was possible to update data.

2

You can just save this as a JS object, change whatever you want for every request, and then use JSON.stringify() to serialize it as the body. Here’s an example:

import http from 'k6/http';
import { sleep } from 'k6';

let data = {
    "oHeader": {
        "sReqType": "application/json",
        "sAppSource": "WEB 2.12.02",
        "sSourceID": "",
        "sAppID": "",
        "sProduct": "PL",
        "dtSubmit": "2020-09-28T16:09:47.574Z",
        "sCroId": "croID",
        "sDsaId": "dsaID",
        "sInstID": 4032,
        "sBranchCode": "5",
        "sLoginId": "loginId",
        "sLoginRole": "role",
        "instituteName": "Test",
        "sDealerId": "dealerID"
    },
    "sRefId": "refID",
};

export default function () {
    data.oHeader.sLoginId = "foo";
    data.oHeader.sLoginRole = "bar";
    data.sRefId = "123";

    let response = http.post("https://httpbin.test.k6.io/anything", JSON.stringify(data));

    console.log(response.body);
}
3

Thanks, Ned. Will check it out