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Luca Jackson
Luca Jackson

Learn load testing with k6.io: A free and open source solution


Download k6.io: A Guide to Load Testing for Engineering Teams




If you are looking for a load testing tool that is easy to use, developer-friendly, and extensible, you might want to check out k6.io. In this article, we will explain what k6.io is, what are its key features and common use cases, and how to install and run your first k6.io test.




download k6.io



What is k6.io?




k6.io is an open-source load testing tool that makes performance testing easy and productive for engineering teams. It is developed by Grafana Labs and the community. Using k6.io, you can test the reliability and performance of your APIs, microservices, and websites, and catch performance problems and regressions earlier. k6.io will help you to build resilient and performant applications that scale.


Key features of k6.io




k6.io is packed with features, which you can learn all about in the . Some of the key features include:



  • CLI tool with developer-friendly APIs.



  • Scripting in JavaScript ES2015/ES6 - with support for local and remote modules.



  • Checks and Thresholds - for goal-oriented, automation-friendly load testing.



  • Load testing by developers - test early and continuously, break the QA silo in performance testing.



  • On your machines, our cloud, or both - scale from solo developers to large enterprises.



  • Use the same script for local, distributed, and cloud tests - migrate from local tests to the cloud using the same script for both environments.



  • Run tests from 21 load zones - simulate real global traffic patterns.



  • More testing with one tool - k6.io is designed for load testing, but extensible to support other types of testing, such as end-to-end web testing, chaos testing, synthetic testing, infrastructure testing, and regression testing.



  • Integrations and Extensions - k6.io integrates with your dev tools, such as Postman, Grafana, New Relic, Datadog, etc. Extensions add new capabilities to k6.io, such as Kubernetes, Prometheus, Kafka, OpenTelemetry, etc.



Common use cases of k6.io




k6.io users are typically Developers, QA Engineers, SDETs, and SREs. They use k6.io for testing the performance and reliability of APIs, microservices, and websites. Some of the common k6.io use cases are:



  • Load testing: Verify that applications can handle the expected traffic. Different goals require different tests: stress tests, spike tests, soak tests, smoke tests, etc.



  • End-to-end web testing: Mix browser and API testing - interact with real browsers and collect frontend metrics to get a holistic user view.



  • Chaos and resilience testing: Enhance your chaos experiments by simulating real-world traffic with k6.io. Inject faults into Kubernetes-based systems to recreate application errors.



  • Synthetic testing: Traditional synthetic/ping testing is not enough anymore. Reuse your k6.io tests to ensure availability in production.



  • Infrastructure testing: Test how cloud-native systems scale. Isolate bottlenecks. Plan and provision infrastructure capacity.



  • Regression testing: Test continuously to track changes in performance and reliability. Prevent software regressions from reaching production.



How to install k6.io?




k6.io is available for Windows, Linux, Mac OS, and Docker How to install k6.io?




k6.io is available for Windows, Linux, Mac OS, and Docker. You can choose the installation method that suits your needs and preferences. Here are the steps to install k6.io on each platform:


How to download k6.io for load testing


Download k6.io and Grafana for performance monitoring


k6.io download and installation guide for Windows


k6.io download and installation guide for Linux


k6.io download and installation guide for Mac


Download k6.io Docker image for easy deployment


Download k6 browser extension for end-to-end web testing


Download k6 cloud service for scalable load testing


Download k6 open source load testing tool


Download k6 JavaScript API documentation


Download k6 examples and tutorials


Download k6 integrations and extensions


Download k6 CLI tool and commands reference


Download k6 results output and analysis guide


Download k6 checks and thresholds guide


Download k6 script editor and debugger


Download k6 best practices and tips


Download k6 load testing manifesto


Download k6 comparison with other load testing tools


Download k6 user reviews and testimonials


Download k6 case studies and success stories


Download k6 roadmap and feature requests


Download k6 support and community resources


Download k6 pricing and plans


Download k6 free trial and demo


How to download k6.io for browser testing


How to download k6.io for chaos and resilience testing


How to download k6.io for performance and synthetic monitoring


How to download k6.io for infrastructure testing


How to download k6.io for regression testing


How to download k6.io for stress testing


How to download k6.io for spike testing


How to download k6.io for soak testing


How to download k6.io for smoke testing


How to download k6.io for API testing


How to download k6.io for microservices testing


How to download k6.io for website testing


How to download k6.io for Kubernetes testing


How to download k6.io for Prometheus testing


How to download k6.io for Grafana testing


How to download k6.io for Postman testing


How to download k6.io for New Relic testing


How to download k6.io for Visual Studio testing


How to download k6.io for IntelliJ IDEA testing


How to download k6.io for Datadog testing


How to download xk6-disruptor extension for fault injection with k6.io


How to migrate from JMeter to k6.io


How to migrate from LoadRunner to k6.io


How to migrate from Locust to k6.io


Windows




If you use the Chocolatey package manager, you can install the unofficial k6 package with:


choco install k6


If you use the Windows Package Manager, install the official packages from the k6 manifests (created by the community):


winget install k6


Alternatively, you can download and run the latest official installer from the .


Linux




k6.io has packages for Debian/Ubuntu and Fedora/CentOS. To install k6.io on Debian/Ubuntu, run the following commands in a terminal:


sudo gpg -k sudo gpg --no-default-keyring --keyring /usr/share/keyrings/k6-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys C5AD17C747E3415A3642D57D77C6C491D6AC1D69 echo "deb [signed-by=/usr/share/keyrings/k6-archive-keyring.gpg] [6]( stable main" sudo tee /etc/apt/sources.list.d/k6.list sudo apt-get update sudo apt-get install k6


To install k6.io on Fedora/CentOS, run the following commands in a terminal:


sudo dnf install [5]( sudo dnf install k6


Mac OS




If you use Homebrew, you can install k6.io with:


brew install k6


Docker




You can also run k6.io as a Docker container. To pull the latest image from Docker Hub, run:


docker pull grafana/k6


How to run your first k6.io test?




Now that you have installed k6.io, you are ready to run your first load test. Here are the steps to follow:


Write a test script in JavaScript




k6.io uses JavaScript as the scripting language for writing load tests. You can use ES2015/ES6 syntax and features, as well as import modules from local or remote sources. You can also use the to define various aspects of your test, such as virtual users, scenarios, requests, checks, thresholds, etc.


For example, here is a simple test script that makes an HTTP GET request to a website and checks if the response status is 200:


// Import the http module import http from 'k6/http'; // Import the check module import check from 'k6'; // Define the URL to test const URL = ' // Define the options for the test export let options = // Define one scenario with 10 virtual users scenarios: example_scenario: executor: 'constant-vus', vus: 10, duration: '30s', , , ; // Define the main function that will run for each virtual user export default function () // Make an HTTP GET request and store the response object let response = http.get(URL); // Check if the response status is 200 check(response, 'status is 200': (r) => r.status === 200, );


You can save this script as example.js in your local directory.


Execute the test locally or in the cloud




To execute the test locally, you can use the k6 CLI tool. In your terminal, navigate to the directory where you saved your script and run:


k6 run example.js


This will start the test and show you some metrics in real-time. You can also use various flags and options to customize your test execution. For example, you can specify a different number of virtual users or duration with:


k6 run -u 20 -d 60s example.js


This will run the test with 20 virtual users for 60 seconds.


If you want to execute your test in the cloud, you can use , a SaaS platform that offers advanced features and integrations for load testing. You can sign up for a free account and get 50 test runs per month. To run your test in the cloud, you need to install the k6 Cloud CLI tool and authenticate with your account. Then, you can run:


k6 cloud example.js


This will upload your script to the cloud and start the test. Yo


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