A module with a better and standard API exists. Dec 3, 2020 · Creating a new k6 extension is very simple if you're familiar with Go, JavaScript and the k6 APIs, but should be approachable by anyone with some programming background. By default it will look for the first form tag in the HTML, but this can be overridden using the formSelector option. connecting: float: Containing time (ms) spent setting up TCP connection to host. We have a generous forever-free tier and plans for every use case. file( data, [filename], [contentType] ) Create a file object that is used for building multi-part With k6 extensions, you can create custom k6 binaries to support your specific reliability-testing needs. In this case, k6 throws a JavaScript exception and exits the execution of the current iteration but continues starting new iterations. These modules are accessed over HTTP(S), from a source like the k6 JSLib or from any publicly accessible web server. In this video, you will learn how you can get start with #k6. Next, k6 uses the options set in a configuration file via the --config flag. Follow along to learn how to run a browser test, interact with elements on the page, wait for page navigation, write assertions and run both browser-level and protocol-level tests in a single script. k6/http The k6/http module contains functionality for performing HTTP transactions. In Visual Studio Code and IntelliJ IDEA Ultimate, you can configure IntelliSense to recognize the k6 JavaScript API by installing the k6 Types with a This could happen at future k6 releases until the module becomes fully stable and graduates as a k6 core module. Our GitHub Releases page has a standalone binary for all platforms. Follow along to learn how to: Run a test. When you run tests in k6 Cloud, the __VU value is per server/load generator. 1. One of the main goals of the project is to provide users Discussion about TLS certificates is usually about how clients authenticate servers. io is a collection of external JavaScript libraries that can be directly imported in k6 scripts. For this to work, we first need to go through a few required steps: Sep 29, 2020 · k6 is a free and open-source load testing tool aiming to make performance testing a productive and enjoyable experience. We mentioned this at the beginning of the guide: automation in performance testing is about establishing a repeatable and consistent testing process. * methods that generate HTTP requests. The name argument is required. You can load the To authenticate requests to AWS APIs using AWS Signature Version 4, k6 offers the k6-jslib-aws JavaScript library, which provides a dedicated SignatureV4 class. mp4 Special acknowledgment to the authors of Playwright and Puppeteer for their trailblazing work in this area. sleep( t ) Suspend VU execution for the specified duration. Subscribe now A modern load testing tool, using Go and JavaScript - https://k6. Engineering teams, including Developers, QA Engineers, SDETs, and SREs, commonly use k6 for: Documentation Grafana k6 JavaScript API k6/http Params. The real power of the browser module shines when it’s combined with the existing features of k6. . Download the k6 binary. js library called uuid and Browserify (to make it work in k6). Params. import { check } from "k6"; import { randomIntBetween, randomItem } from "https://jslib. Using k6 extensions. This could happen at future k6 releases until the module becomes fully stable and graduates as a k6 core module. Complement automation with a repeatable QA process. Network throughput Documentation Grafana k6 JavaScript API k6/net/grpc Client. cookieJar() Get active HTTP Cookie jar. js, the output at the end of the test shows: Running k6. Product developments and news from the k6 community. Experimental modules maintain a high level of stability and follow regular maintenance and security measures. An overview of the k6 resources beyond the k6 docs: videos, repositories, test servers, courses, and more Then, you can use check from the k6 API to assert the text content of a specific element. blocked: float: Containing time (ms) spent blocked before initiating request. Extend the JavaScript APIs available to your test scripts. The engine is modern; you can feel the maturity of the design and its APIs. k6. The k6/crypto module provides common hashing functionality available in the GoLang crypto package. Parameter Type Jun 12, 2023 · Well, under the hood, K6 uses Go and embeds a Javascript runtime meaning the scripting is all done in Javascript/Typescript but the execution is in Go enabling it to be highly performant whilst Examples Get started with k6 Single request HTTP Authentication OAuth Authentication Correlation and Dynamic Data Data Parameterization Parse HTML HTML Forms Cookies Example Data Uploads API CRUD Operations Generating UUIDs HTTP2 WebSockets SOAP Transport Layer Security (TLS) Generating realistic data Crawl a web page Bundling and transpilation Functional testing Track transmitted data per URL Download the k6 binary. Gauge. For each k6 scenario, the VU workload is scheduled by an executor. That is, command-line flags have the highest order of precedence. However, both TLS and k6 also support the reverse process, in which servers authenticate clients. Finally, you close the page and the browser. By restricting it to the init context, we can easily determine what local files are needed to run the test and thus what we need to bundle up when distributing the test to multiple nodes in a clustered/distributed test. If you use one or more k6 extensions, you need a k6 Documentation Grafana k6 JavaScript API k6. The following outputs include pre-built Grafana dashboards for their storage: Mar 23, 2021 · TIGの伊藤真彦です。業務で行っている開発がいよいよリリースを視野に入れたフェーズに入り、E2Eテストや各種性能試験を行いました。 負荷試験とはリリース前に行いたい試験の一つに負荷試験があります。 なるべく実際の運用に近い環境、データベースの状態を整え、実際に利用されるで Documentation Grafana k6 JavaScript API k6 sleep( t ) Open source. Parameter Type Description; data: string / Array / ArrayBuffer: File data as string, array of numbers, or an ArrayBuffer object. Small things like this help make a developer’s barrier to entry into performance testing as smooth as possible. This release of k6 introduces the new k6/experimental/streams module, which partially supports the JavaScript Streams API, focusing initially on the ReadableStream construct. This might not be ideal because: system errors are propagated as exceptions that are not reported on the test results; you might want to embrace these errors - as normal - and continue the execution Parameter Type Description; content: string: The string to search through (e. Where to set AWS Signature v4 authentication with the k6-jslib-aws. This example uses a Node. Therefore, we do not have access to methods like describe or it blocks that we normally have access to, nor do we have access to assertion libraries like chai . Params is an object used by the http. VUs are completely separate JS VMs, and k6 needs some way to identify the SharedArray that it needs to return. random`. Open source RSS. 43. k6-rollup-example: Example using Rollup and Babel to bundle a common library and testing suite. Getting started with the Grafana LGTM Stack. Response This function can only be called from the init context (aka init code), code in the global context that is, outside of the main export default function { . io/k6-utils/1. Subscribe to our newsletter! Product developments and news from the k6 community. FileData: Used for wrapping data representing a file when doing multipart requests (file uploads). k6 helps engineering teams prevent errors and SLO breaches, enabling them to build resilient and high-performing applications that scale. From docs, community discussions, and chats with engineers, I had a good sense of k6 capabilities. Using k6, you can test the reliability and performance of your application and infrastructure. com/QAInsights/Learn-k6-Series ️ In this case, the test met the criteria for both thresholds. This call caches the deserialized JSON data, additional calls will return the cached data. While the JavaScript VM that k6 uses is very different and runs on Go, the general principles apply. K6 is used by Amazon, Microsoft, Grafana, Gitlab, Citrix, etc. Note that memory leaks are still possible in k6 scripts, and, if not fixed, they might exhaust RAM much more quickly. It is one of the four custom metrics. OAuth authentication. Function Description; randomIntBetween(min, max) Random integer in a given range: randomItem(array) Random item from a given array: randomString(length, [charset]) WebSocket. JAVASCRIPT API. Function Description; check(val, sets, [tags]) See full list on github. com Jul 9, 2019 · Imports: This is obviously where you can import k6 Script API, and other JavaScript modules (libraries) that you desire to make use of. If set to gzip it will use gzip to compress the body and set the appropriate Content-Length and Content-Encoding headers. : filename: string: The filename to specify for this field (or "part") of the multipart request. Read more. Executors configure how long the test runs, whether traffic stays constant or changes, and whether the workload is modeled by VUs or by arrival rate (that is, open or closed models). ℹ️ Identifiers. Nov 28, 2022 · The problem is that although we write K6 tests in JavaScript, K6 itself is written in GoLang, an so we run into issues with Linting when importing K6. --http-debug logs the HTTP requests and responses, skipping the body. Aug 17, 2022 · For detailed k6 practice, check out the k6 workshop. k6 Javascript tests allows you to develop complex tests and debug performance problems across your organization. Add virtual users. ioGitHub Repo: https://github. Mouse double click on the chosen element. locator. 0, xk6-browser is now bundled in k6 as an experimental module, and usable without a separate binary or compilation step! xk6-browser-async-await. JSLib: A collection of k6 JavaScript libraries maintained by Grafana Labs and available as remote modules. May 17, 2023 · またクラウド上から負荷テストを実行できるk6クラウドというSaaS型のサービスもあります。 オープンソース版とクラウド版の比較はこちら. Avoid using group with async functions or asynchronous code. The k6/execution module provides the test execution information with the following properties The encoding module provides base64 encoding/decoding as defined by RFC4648. This might not be ideal because: system errors are propagated as exceptions that are not reported on the test results; you might want to embrace these errors - as normal - and continue the execution Having a JavaScript-based tool allows the authoring of complex tests to happen quickly, and when combined with the rich analytics of Grafana k6, our developers and QA team get a powerful toolset to test applications and make informed decisions. Extensions directory: A collection of k6 extensions maintained by Grafana Labs and the community. (new in k6 v0. We’ll demo how to get started using the LGTM Stack: Loki for logs, Grafana for visualization, Tempo for traces, and Mimir for metrics. If any of the thresholds had failed, the little green checkmark next to the threshold name (http_req_failed, http_req_duration) would be a red cross and k6 would exit with a non-zero exit code. BDD style to construct k6 assertions. For reference, see the script example below: May 15, 2023 · Frame challenge ahead. Using k6, you can stream your local test results to any backend. Open source. Sep 17, 2022 · 當系統預期有很多人同時上線時，可能會需要進行壓力測試。比起老牌工具 Apache Jmeter 的高學習難度，k6 是一套很好的壓力測試工具，對於開發人員來說非常友善。本文將簡單介紹如何使用 k6 進行壓力測試。 Parses the response body data as JSON and returns a JS object or array. Finally, k6 takes the value from the CLI flag (if set). The imported modules are downloaded and executed at runtime, making it extremely important to make sure you trust the code before including it in a test script. The documentation states that it takes the "duration, in seconds", but fails to explicitly mention that fractional seconds are supported as well. Read the details in the cloud docs. Contribute to chanhosang/k6-examples development by creating an account on GitHub. The flexibility and interoperability of Grafana and k6 let you visualize test and observability data in one dashboard, regardless of where the data is stored. You can read in your script the execution state during the test execution and change your script logic based on the current state. k6 considers this test a pass and exits with an exit code 0. Running in k6 Cloud. To set/override the form fields you set properties of an object in the fields option. But, unlike other tests, load tests run their scripts hundreds, thousands, or millions of times. Gauge is an object for representing a custom metric holding only the latest value added. The following examples take a set of arguments, shown in the function documentation, and returns the response body as JSON so that you can extract the token from. To stop a k6 test, learn how to use the abortOnFail threshold option or integrate with the k6 CLI or Grafana Cloud k6. ping() Send a ping. The tool is scriptable, and k6 tests are written in Javascript, giving the ability to write your tests in one of the most well-known programming languages around. VS Code & IntelliJ. 0/index. The new k6/experimental/webcrypto API partially implements the WebCryptoAPI, supporting more features than k6/crypto. File upload considerations. Where to Jul 19, 2018 · That's one of the reasons k6 decided to go with JavaScript as the language it uses for creating performance tests. 1+) and turn them into requests to load test your website or API. While we intend to keep experimental modules as stable as possible, we may need to introduce breaking changes. 29. k6 API; xk6-disruptor; jslib; Cloud Docs. With the ReadableStream , users can define and consume data streams within k6 scripts. io - k6/README. SSL/TLS client certificates Discussion about TLS certificates is usually about how clients authenticate servers. First, k6 uses the option's default value. 0) HTTP status text returned by the server. A good starting point is always seeing how existing extensions work, but in this section we're going to guide you through the steps for creating a new extension from scratch. compression: string: Sets whether the request body should be compressed. eslintrc. Example A k6 script that initiates a WebSocket connection, sends a ping, and closes it using the onopen handler. These modules can be loaded using various methods: bundled . Parameter Type Description; t: number: Browser module: page. timings. All unique identifiers are sequentially generated starting from a base of zero (iterations) or one (VU IDs). Modern load testing for developers and testers in the DevOps era. g. Add support for new network protocols, improve performance compared to equivalent JS Jul 3, 2023 · With k6, you can write test scripts in JavaScript to define user scenarios, set virtual user behavior, and analyze the performance metrics and results. Examples k6/execution provides the capability to get information about the current test execution state inside the test script. , 60000 is equivalent to "60s". Understand the Basics of K6. js"; export const options = { "duration": "10s k6 data API. Check Javascript API; Failing a load test using checks; k6chaijs: use BDD assertions in k6 Browser module: Locator Class. In JavaScript Remote HTTP(S) modules. This method takes an object argument where the following properties can be set: Param Type Description Set seed to get a reproducible pseudo-random number using `Math. js file In this case, the test met the criteria for both thresholds. waitForLoadState(state[, options]) method Access to k6 documentation when writing and hovering code. Trend is an object for representing a custom metric that allows for calculating different statistics on the added values (min, max, average or percentiles). You have multiple ways to structure batch requests: In an array of arrays; As an object or array of objects; As an array of URL strings Advanced Examples using the k6 Scenario API - Using multiple scenarios, different environment variables and tags per scenario. 4. Response. Grafana Cloud k6; k6 Cloud; but they will be reused and extended to support other protocols in future k6 Parameter Type Description; requests: array : | object: An array or object containing requests, in string or object form Scenario executors. Get Started with k6 at https://k6. With these example snippets, you’ll run the test with your machine’s resources. Library Description; aws: Jan 30, 2024 · If you have scripted tests before, implementing k6 scripts should seem familiar. In this webinar, learn how Grafana Cloud k6 offers you the best developer experience for performance testing. exe binary in your PATH to run k6 from any location. function: function Response. If you start promise chains or even use await within group, some code within the group will be waited for and tagged with the proper group tag, but others won't be. As you know, JavaScript is probably the most common language among developers. But I couldn't implement any test logic, as I couldn't write JavaScript. This class can produce authenticated requests to send to AWS APIs using the http k6 module. The JavaScript runtime transparently converts Go types like int64 to their JS equivalent. The k6 Examples & Tutorials is a directory with common k6 examples and the most popular tutorials using k6. Then, learn GUI and Code-based testing with JavaScript and Upgrade to K6 & K6 Cloud for better developer experience. Method Description; To stop a k6 test, learn how to use the abortOnFail threshold option or integrate with the k6 CLI or Grafana Cloud k6. Promotion Video Walkthrough. As k6 doesn't have built-in support for version 1 UUID, you'll have to use a third-party library. In k6, the environment variables are exposed through a global __ENV variable, a JS object. Then, k6 uses the script value (if set). md at master · grafana/k6 In this case, k6 throws a JavaScript exception and exits the execution of the current iteration but continues starting new iterations. When you run this test with k6 run script. A boolean specifying whether k6 should linger around after test run completion: Local IPs: A list of local IPs, IP ranges, and CIDRs from which VUs will make requests: Log output: Configuration about where logs from k6 should be send: LogFormat: Specify the format of the log output: Max redirects: The maximum number of HTTP redirects that k6 First, k6 uses the option’s default value. To use client certificates, specify global configuration options that tell k6 how to map a public certificate and private key to the domains they are valid for. Grafana Cloud k6; k6 Cloud; Jun 25, 2024 · Like unit testing, for performance. Client. If you use one or more k6 extensions, you need a k6 As of k6 version 0. Custom k6 builds. This is particularly useful in specific contexts, such as integrating k6 into your CI pipelines or receiving alerts when scheduling your performance tests. You can have multiple SharedArrays and even load only some of them for given VUs, though this is unlikely to have any performance benefit. To authenticate requests to AWS APIs using AWS Signature Version 4, k6 offers the k6-jslib-aws JavaScript library, which provides a dedicated SignatureV4 class. After downloading and extracting the archive for your platform, place the k6 or k6. Sep 25, 2021 · Portanto o k6 utiliza a linguagem JavaScript para a criação dos cenários de teste. k6 has its TypeScript Type Definition that you can configure with your editor to unlock code editing features. Jun 17, 2019 · k6 is a Free/Open-Source tool, written in Go, which can ingest tests written in JavaScript (ES5. Download · Documentation · Community Forum. Parameter Type Description; name: string: Test case name. Rate is an object for representing a custom metric keeping track of the percentage of added values that are non-zero. k6 provides group() and check() methods that work the same way we Apr 6, 2023 · 與老牌工具 JMeter 相比，K6 比較年輕(2017 vs 2007)，架構與設計現代化許多，採用 Go + JavaScript，聽起來就比 Java 年輕有活力。K6 沒有如 JMeter 的華麗友善 GUI，測試細節全靠指令參數與程式碼決定，但這正中程式開發人員下懷，CLI、敲指令才是王道呀! Nov 11, 2020 · Examples of K6 test scripts for study purpose. File uploads can affect both resource usage and cloud costs. The test case name should be unique. sleep in k6 is a synchronous call and blocks execution, there is (currently) no need to use asynchronous methods to do the same. del( url, [body], [params] ) Issue an HTTP DELETE request. __VU and __ITER are both global variables with execution-context information that k6 makes available to the test script. To use client certificates, specify global configuration options that tell k6 how to map a public certificate and private key to the domains they are valid for At the same time, its commercial cloud scaling enables you to push your application to its limit. But, if you have a k6 Cloud account, you can also use the k6 cloud command to outsource the test to k6 Oct 15, 2023 · K6 is a developer-centric, open-source performance testing tool designed to be simple, efficient, and scriptable. k6 is a modern load-testing tool, built on our years of experience in the performance and testing industries. dispatchEvent(type, eventInit, [options]) Class Description; CookieJar: Used for storing cookies, set by the server and/or added by the client. Duration is a string specifying the total duration a test should be run. The presence of load creates a few specific concerns. The k6 module contains k6-specific functionality. For reference, see the script example below: websockets Caution This is an experimental module. Ramp the number of requests up and down as the test runs. After, k6 uses the environment variable (if set). submitForm( [params] ) Fill in and submit form found in HTML of response. With k6 extensions, you can create custom k6 binaries to support your specific reliability-testing needs. Currently, k6 supports two ways to extend its native functionality: JavaScript extensions extend the JavaScript APIs available to your test scripts. For more information, refer to the extension graduation process . The Cloud user interface is intuitive and powerful. The quick solution to Lint K6 Thankfully there is a quick and easy solution, and that is to add a set of custom rules to our . In distributed/cloud test runs, the test-wide iteration numbers and VU identifiers are still going to be unique across instances, though there might be gaps in the sequences when, for example, some instances execute faster iterations than others or allocate more VUs Documentation Grafana k6 JavaScript API k6/metrics Gauge. fail() is a simple convenience wrapper on top of JavaScript’s throw(), because the latter cannot be used as [expr] || throw, which is a convenient way to write k6 test code. You can use ping messages to verify that the remote endpoint is responsive. Mar 17, 2020 · How do we accomplish this without having to maintain long data tables? In this article, we'll explore how we may utilize fakerjs and k6 to perform load tests using realistic generated data. The variable is 0 when executing the setup and teardown functions. If you do, k6 might apply tags in a way that is unreliable or unintuitive. Here’s an example script to demonstrate how to sign a request to fetch an object from an S3 In this webinar, learn how Grafana Cloud k6 offers you the best developer experience for performance testing. Jan 4, 2022 · Because we k6 uses goja and not JavaScript, we are able to use only some aspects of JavaScript to execute our tests. k6 tests are written in JavaScript, and the design of the k6 API has similarities with other testing frameworks. k6は、installationに各OSごとのインストール方法が記載されており、簡単にインストールできます。 Grafana k6 is an open source load testing tool that uses test scripts written in JavaScript to help you easily find and fix issues before they reach production. Jun 29, 2021 · k6 is a JavaScript script scriptable high-performance load testing tool. It allows you to write test scripts in JavaScript, making it accessible to An overview of the k6 resources beyond the k6 docs: videos, repositories, test servers, courses, and more Current VU number in use. Course Curriculum Summary. Things don't always work as expected. body) left: string: The string immediately before the value to be extracted: right Request definition. Passing environment variables to the k6 Script; Configuring k6 Options with environment variables; Passing environment variables to the k6 script. If you start promise chains or even use await within group, some code within the group will be waited for and tagged with the proper group tag, but others won’t be. JAVASCRIPT API; Cloud Docs. k6 provides features like distributed load testing, scripting flexibility, metrics visualization, and integration with CI/CD pipelines. Backed by 20 years of experience. For those cases, enabling the --http-debug option will log HTTP requests and responses to help you debugging the script. k6. Run both browser-level and protocol-level tests in a single script. Experimental modules maintain a high level of stability The type can also be a number, in which case k6 interprets it as milliseconds, e. Understand API Performance Testing This could happen at future k6 releases until the module becomes fully stable and graduates as a k6 core module. k6のインストール. Function Description batch( requests ) Issue multiple HTTP requests in parallel (like e. Warning. k6 assigns the value incrementally for each new VU instance, starting from one. timings: object: Performance timing information for the HTTP request. Otherwise, the test case will be grouped. Dec 1, 2020 · k6 works with the concept of virtual users (VUs), which run scripts. Scripting examples on how to use OAuth authentication in your load test. Client is a gRPC client that can interact with a gRPC server. External JavaScript libraries for k6. The design of these architecture capacities offers several compensations: Not running in a browser This means that k6 does In this webinar, learn how Grafana Cloud k6 offers you the best developer experience for performance testing. Increase the test duration. Casos de uso da ferramenta k6? O k6 é utilizado por desenvolvedores, engenheiros de controle de qualidade e Jan 30, 2024 · Grafana Cloud is the easiest way to get started with Grafana k6 and performance testing. What is k6? k6 is an open-source performance testing tool written and maintained by the team at k6. __ITER: A numeric counter with the current iteration number for a specific VU. The jslib. browsers tend to do). User-centered observability: load testing, real user monitoring, and synthetics Learn how to use load testing, synthetic monitoring, and real user monitoring (RUM) to understand end users' experience of your apps. Currently, k6 supports two ways to extend its native functionality: JavaScript extensions. For more information, refer to the extension graduation process.
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