K6 - Authentication - Get Auth Token - authentication

Question

I have a mocha javascript file in which I have require function to login to the application in headless browser mode, login using the crendentials and return the jwt authentication.
I want to call this script through K6. But as I understand, calling node module java script from K6 is not possible?
Is there an alternative to this?

Answer 1

I have also just started implementing k6 and had same step to do ;)
Here is how I have done it.
you need to know how to authenticate to the API you want to use. I assume we have it, as you wrote you want to use node modules.
second, use appropriate method to communicate with API
next, catch token and append it to next requests headers
finally, test API with requests you want
I found code snippets on web page with k6 samples for APIs.
I have shorten a bit, sample code and end up with:
import {
describe
} from 'https://jslib.k6.io/functional/0.0.3/index.js';
import {
Httpx,
Request,
Get,
Post
} from 'https://jslib.k6.io/httpx/0.0.2/index.js';
import {
randomIntBetween,
randomItem
} from "https://jslib.k6.io/k6-utils/1.1.0/index.js";
export let options = {
thresholds: {
checks: [{
threshold: 'rate == 1.00',
abortOnFail: true
}],
},
vus: 2,
iterations: 2
};
//defining auth credentials
const CLIENT_ID = 'CLIENT_ID';
const CLIENT_SECRET = 'CLIENT_SECRET';
let session = new Httpx({
baseURL: 'https://url.to.api.com'
});
export default function testSuite() {
describe(`01. Authenticate the client for next operations`, (t) => {
let resp = session.post(`/path/to/auth/method`, {
//this sections relays on your api requirements, in short what is mandatory to be authenticated
grant_type: GRANT_TYPE,
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
});
//printing out response body/status/access_token - for debug
// console.log(resp.body);
// console.log(resp.status);
// console.log(resp.json('access_token'));
//defining checks
t.expect(resp.status).as("Auth status").toBeBetween(200, 204)
.and(resp).toHaveValidJson()
.and(resp.json('access_token')).as("Auth token").toBeTruthy();
let authToken = resp.json('access_token');
// set the authorization header on the session for the subsequent requests.
session.addHeader('Authorization', `Bearer ${authToken}`);
})
describe('02. use other API method, but with authentication token in header ', (t) => {
let response = session.post(`/path/to/some/other/post/method`, {
"Cache-Control": "no-cache",
"SomeRequieredAttribute":"AttributeValue"
});
t.expect(response.status).as("response status").toBeBetween(200, 204)
.and(response).toHaveValidJson();
})
}