K6 - breakup of results for each api request

Question

I am working on developing load testing for one workflow using HTTP request calls. In the workflow, the response of one API call is used in the next API's call either as a parameter or as a request body. So, the sequence in which API is called is very important.

My question is about the result. Is there any mechanism in K6 by which I get a breakup of how much time it took to execute each API call?

Answer 1

Yes, you can filter metrics by their (default or custom) tags. Here is an example:

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

export const options = {
  thresholds: {
    'http_req_duration{name:${}/endpoint1}': [ 'avg>0' ], // arbitrary threshold
    'http_req_duration{name:${}/endpoint2}': [ 'avg>0' ],
  },
};

export default function() {
  const server = 'http://example.com';
  const token = http.get(http.url`${server}/endpoint1`).json('token');
  check(
    http.post(http.url`${server}/endpoint2`, 'token=' + token),
    {
      'token accepted': r => r.status === 200,
    });
}

String templates tagged with http.url will automatically set the name tag for your requests, allowing you to easily filter a subset of requests.