post( url, [body], [params] )

import http from 'k6/http';

const url = 'https://quickpizza.grafana.com/api/json';
const logoBin = open('./logo.png', 'b');

export default function () {
  let data = { name: 'Bert' };

  // Using a JSON string as body
  let res = http.post(url, JSON.stringify(data), {
    headers: { 'Content-Type': 'application/json' },
  });
  console.log(res.json().json.name); // Bert

  // Using an object as body, the headers will automatically include
  // 'Content-Type: application/x-www-form-urlencoded'.
  res = http.post(url, data);
  console.log(res.json().form.name); // Bert

  // Using a binary array as body. Make sure to open() the file as binary
  // (with the 'b' argument).
  http.post(url, logoBin, { headers: { 'Content-Type': 'image/png' } });

  // Using an ArrayBuffer as body. Make sure to pass the underlying ArrayBuffer
  // instance to http.post(), and not the TypedArray view.
  data = new Uint8Array([104, 101, 108, 108, 111]);
  http.post(url, data.buffer, { headers: { 'Content-Type': 'image/png' } });
}