WireMock is a simulator for HTTP-based APIs. Some might consider it a service virtualization tool or a mock server. It enables you to stay productive when an API you depend on doesn't exist or isn't complete. It supports testing of edge cases and failure modes that the real API won't reliably produce. And because it's fast it can reduce your build time from hours down to minutes.
 
It supports HTTP response stubbing, matchable on URL, header and body content patterns, Request verification, Fault injection, Per-request conditional proxying, Configurable via a fluent Java API, JSON files and JSON over HTTP and lot more.

WireMock is a simulator for HTTP-based APIs. Some might consider it a service virtualization tool or a mock server. It enables you to stay productive when an API you depend on doesn't exist or isn't complete. It supports testing of edge cases and failure modes that the real API won't reliably produce. And because it's fast it can reduce your build time from hours down to minutes. 



Wiremock - A tool for mocking HTTP services

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Powerful JSON & XML assertions are built-in, and you can run tests in parallel for speed.
 
Test execution and report generation feels like any standard Java project. But there’s also a stand-alone executable for teams not comfortable with Java. You don’t have to compile code. Just write tests in a simple, readable syntax - carefully designed for HTTP, JSON, GraphQL and XML. And you can mix API and UI test-automation within the same test script.

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Powerful JSON & XML assertions are built-in, and you can run tests in parallel for speed.



karate - Test Automation Made Simple

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Assertions and HTML reports are built-in, and you can run tests in parallel for speed.
 
Its features include: 
<ul>
<li>Scripts are plain-text, require no compilation step or IDE, and teams can collaborate using Git / standard SCM</li>
<li>Elegant&nbsp;<a href="https://en.wikipedia.org/wiki/Domain-specific_language">DSL</a>&nbsp;syntax &lsquo;natively&rsquo; supports JSON and XML - including&nbsp;<a href="https://karatelabs.github.io/karate/#set">JsonPath</a>&nbsp;and&nbsp;<a href="https://karatelabs.github.io/karate/#xpath-functions">XPath</a>&nbsp;expressions</li>
<li>Tests are super-readable - as scenario data can be expressed in-line, in human-friendly&nbsp;<a href="https://karatelabs.github.io/karate/#json">JSON</a>,&nbsp;<a href="https://karatelabs.github.io/karate/#xml">XML</a>, Cucumber&nbsp;<a href="https://karatelabs.github.io/karate/#the-cucumber-way">Scenario</a>&nbsp;Outline&nbsp;<a href="https://karatelabs.github.io/karate/#table">tables</a>, or a&nbsp;<a href="https://karatelabs.github.io/karate/#set-multiple">payload builder</a>&nbsp;approach&nbsp;<a href="https://gist.github.com/ptrthomas/d6beb17e92a43220d254af942e3ed3d9">unique to Karate</a></li>
<li><a href="https://github.com/intuit/karate/wiki/IDE-Support#vs-code-karate-plugin">Fully featured debugger</a>&nbsp;that can step&nbsp;backwards&nbsp;and even&nbsp;<a href="https://twitter.com/KarateDSL/status/1167533484560142336">re-play a step while editing it</a>&nbsp;- a&nbsp;huge&nbsp;time-saver</li>
<li>Ideal for testing the highly dynamic responses from&nbsp;<a href="http://graphql.org/">GraphQL</a>&nbsp;API-s because of Karate&rsquo;s built-in&nbsp;<a href="https://karatelabs.github.io/karate/#text">text-manipulation</a>&nbsp;and&nbsp;<a href="https://github.com/json-path/JsonPath#path-examples">JsonPath</a>&nbsp;capabilities</li>
<li>Re-use of payload-data and user-defined functions across tests is&nbsp;<a href="https://karatelabs.github.io/karate/#reading-files">so easy</a>&nbsp;- that it becomes a natural habit for the test-developer</li>
<li>Support for&nbsp;<a href="https://karatelabs.github.io/karate/#data-driven-tests">data-driven tests</a>&nbsp;and being able to&nbsp;<a href="https://karatelabs.github.io/karate/#tags">tag or group</a>&nbsp;tests is built-in, no need to rely on an external framework</li>
<li>Multi-threaded&nbsp;<a href="https://karatelabs.github.io/karate/#parallel-execution">parallel execution</a>, which is a huge time-saver, especially for integration and end-to-end tests</li>
<li>Option to use as a light-weight&nbsp;<a href="https://github.com/intuit/karate/tree/master/karate-netty#standalone-jar">stand-alone executable</a>&nbsp;- convenient for teams not comfortable with Java</li>
<li>Cross platform&nbsp;<a href="https://karatelabs.github.io/karate/karate-robot">Desktop Automation</a>&nbsp;that can be&nbsp;<a href="https://twitter.com/ptrthomas/status/1215534821234995200">mixed into Web Automation flows</a>&nbsp;if needed</li>
<li>Gatling integration can hook into&nbsp;<a href="https://github.com/intuit/karate/tree/master/karate-gatling#custom">any&nbsp;custom Java code</a>&nbsp;- which means that you can perf-test even non-HTTP protocols such as&nbsp;<a href="https://github.com/thinkerou/karate-grpc">gRPC</a></li>
<li><a href="https://karatelabs.github.io/karate/karate-mock-servlet">Mock HTTP Servlet</a>&nbsp;that enables you to test&nbsp;any&nbsp;controller servlet such as Spring Boot / MVC or Jersey / JAX-RS - without having to boot an app-server, and you can use your HTTP integration tests un-changed</li>
<li>&nbsp;</li>
</ul>

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Assertions and HTML reports are built-in, and you can run tests in parallel for speed.

Smocker (server mock) is a simple and efficient HTTP mock server. Smocker exposes two ports: Port 8080 is the mock server port. It will expose the routes you register through the configuration port and Port 8081 is the configuration port. It's the port you will use to register new mocks. This port also exposes a user interface.

Smocker - Simple and efficient HTTP mock server

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