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Params is an object used by the WebSocket methods that generate WebSocket requests. Params contains request-specific options like headers that should be inserted into the request.

Params.headersobjectObject with key-value pairs representing custom headers the user would like to add to the request.
Params.tagsobjectKey-value pairs where the keys are names of tags and the values are tag values. Response time metrics generated as a result of the request will have these tags added to them, allowing the user to filter out those results specifically, when looking at results data.

Example of custom metadata headers and tags

A k6 script that will make a WebSocket request with a custom header and tag results data with a specific tag

import ws from 'k6/ws';
export default function () {
const url = 'ws://';
const params = {
headers: { 'X-MyHeader': 'k6test' },
tags: { k6test: 'yes' },
const res = ws.connect(url, params, function (socket) {
socket.on('open', function () {
console.log('WebSocket connection established!');