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K6 – Performance Testing Masterclass with JavaScript

Name: K6 – Performance Testing Masterclass with JavaScript
Rating: 4.8 (186 reviews)

Learn API and Browser Load Testing using K6 -JavaScript, Web Vitals, Core Metrics & Grafana cloud Integration

Bestseller

Highest Rated

Created byRahul Shetty Academy - 1.2 Million QA Learners

Last updated 3/2026

English

What you'll learn

Design and implement Load, Stress, Spike and Soak tests using K6 with real-world performance scenarios.
Design realistic load models using stages, thresholds, checks, tags and custom metrics.
Build end-to-end API load testing flows in K6 including registration, login and transactional scenarios.
Implement browser-level load testing using K6 Browser library with Playwright integration.
Measure and analyze API and Browser performance metrics including Web Vitals and page-wise tracking.
Integrate K6 with Grafana Cloud to visualize, monitor and analyze performance metrics in real time.
Execute end-to-end performance testing projects from planning to result interpretation.

Course content

10 sections • 47 lectures • 6h 13m total length

Introduction to Course - FAQ's6:59
What is Smoke Testing in context of Performance Testing Projects2:52
Load Testing - Non Functional validation - The Happy Path Testing4:44
Stress Testing - Non Functional Validation with example Scenarios7:49
Spike Testing - Understand Definition & When this testing type is required5:09
Soak Testing - Understand Definition and example scenarios to decide when to use8:09
Soak testing uses a moderate, continuous load for extended periods to reveal memory leaks and resource exhaustion, using K6 or JMeter to benchmark over 24 to 48 hours.
Quiz 1

Code Download0:03
Understand Expected Response & Threshold metrics and how that props are defined12:40
Explore how to measure expected responses and thresholds in k6 by filtering for 200 OK requests, computing HTTP request duration, and applying percentile and failure-rate thresholds.
How to design real time simulations with ramp up & down using stages property9:47
How to implement Checks to bring Validation into K6 Load tests14:27
Understand the importance of Tags & how that helps to filter down result metrics9:32
What are Custom Metrics? How they help us to fine tune Load Testing results13:53
Learn how to create and use custom metrics with the trend class in K6 to measure server processing time, waiting time, and 95th percentile thresholds for load testing.
Quiz 3

Understand the idea behind building Performance scripts in the application8:15
Build end-to-end functional flows and apply load testing on core API calls like login and get all products with K6 to identify bottlenecks and optimize performance.
Code download0:08
Demo of Load Testing example - QuickPizza Grafana and their API's contract5:49
Part 1 -Step by step build a registration API call flow scripting in K6 function12:14
Part 2 -Step by step build a registration API call flow scripting in K6 function9:05
Build an end-to-end registration API flow in k6, asserting status 201, logging outcomes, and preparing for login, token usage, and CRUD operations in a later step.
Intro to K6 Groups & Build a Login API call flow scripting in K6 function8:25
Extracting values from API Json response and having assertion within K6 function11:56
Quiz 4

Building k6 options object with Stages -Thresholds & Checks for Test built6:34
Build Create order API in the Postman to understand the scripting flow14:34
Understand Retrieve order API construction & build into K6 Script flow7:38
How to build Group based Metrics into K6 to build Module level Load Parameters5:54
Custom Metric - Rate & How it help to build Customized k6 Load Metrics8:40
Custom Metric - Counter & How it help to build Customized k6 Load Metrics6:09
Quiz 5

Introduction to the Grafana Dashboard to visualize the K6 results6:29
Understand how to connect Local k6 Tests to Grafana cloud with an example9:32
Learn to connect local K6 tests to Grafana Cloud, authenticate with a token, configure project id and distribution, and run tests in the cloud to monitor results in Grafana dashboards.
Optimizing the K6 E2E Scripts into Framework standards with reusable components5:19
Optimize k6 end-to-end scripts into framework standards by converting the test into reusable components and runtime-configurable options via test configs.json for smoke, load, spike, and other performance tests.
Build Load Testing types Config Json file to dynamically load into K6 options10:15
Explain how to read a per-test JSON configuration for k6, parse it into a JavaScript object, and select a test type via environment variable to drive load, smoke, and scenarios.
Quiz 8

Dynamically load Stages & Thresholds for a K6 config from external resources9:59
Understand the Life cycle of K6 Script File stage by stage with demo example7:20
Understand the life cycle of a k6 script, from init code and setup to the default function and teardown, with health checks, base URL validation, and data passed from setup.
Jenkins Installation for CI/CD Setup10:20
Integrate K6 Project to CI/CD Jenkins and kick the K6 Scripts on Grafana cloud12:15
Quiz 9

Requirements

None. JavaScript basics are already covered as part of the course.

Description

Performance testing today is not just about generating load — it is about measuring, analyzing, and validating system behavior across APIs and browsers with proper observability.

This K6 Performance Testing MasterClass teaches you how to design complete performance testing solutions using K6 and JavaScript — covering both backend API flows and frontend browser-level validation.

You will start by mastering core K6 concepts including stages, thresholds, checks, tags, and custom metrics. You will learn how to design realistic load models and validate non-functional requirements effectively.

The course then walks you through building real-world API test flows such as registration, login, and transactional chains. You will extract dynamic data from JSON responses, implement assertions, and structure modular K6 scripts using JavaScript best practices.

Beyond APIs, you will integrate the K6 Browser library with Playwright to perform browser-level load testing. You will capture Web Vitals metrics such as LCP and CLS, track page-wise performance, and validate real user experience under load.

A dedicated section covers Grafana Cloud integration, where you will stream K6 metrics to Grafana dashboards for real-time monitoring, visualization, and performance analysis. This bridges the gap between load generation and observability — a key skill in modern DevOps environments.

Finally, you will integrate K6 tests into CI/CD pipelines to automate performance validation.

By the end of this course, you will be capable of designing scalable, observable, production-ready performance testing frameworks using K6.

This is a complete API + Browser + Observability Performance Engineering MasterClass.

Who this course is for:

Software Testers
QA Engineers
SDET
Developers

K6 – Performance Testing Masterclass with JavaScript

What you'll learn

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Course content

Performance Testing Foundations with K6 – The Top 5 Testing Types Explained6 lectures • 36min

K6 Setup & Result Metrics – Getting Your Performance Testing Environment Ready4 lectures • 36min

K6 Core Concepts – Learn Thresholds, Stages, Tags, Custom Metrics, Assertions6 lectures • 1hr

API Tests in K6 Function module to build End to End user functional flow7 lectures • 56min

Build Realistic Load Scenarios on Functional API tests with K6 Core concepts6 lectures • 49min

Browser UI Tests with Playwright K6 Integration to build the Functional UI flow4 lectures • 43min

Build Realistic Load Scenarios on Functional UI tests with K6 Core concepts3 lectures • 20min

Executing k6 Load Tests on Grafana Cloud Platform with Great visualizing reports4 lectures • 32min

Learn Life cycle flow of K6 & Integrate Load Tests into CI/CD Jenkins Pipelines4 lectures • 40min

Resources - Next Steps3 lectures • 2min

Requirements

Description

Who this course is for: