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title: WireMock - flexible, open source API mocking
description: WireMock is a tool for building mock APIs. API mocking enables you build stable, predictable development environments when the APIs you depend on are unreliable or don't exist.
header_signup_link: "https://www.wiremock.io/product?utm_source=wiremock.org&utm_medium=referral&utm_campaign=masthead"
---

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    <h1 class="home-hero__title">Mock the APIs You Depend On</h1>

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          <img
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          Open Source
        </h2>
        <p>
          The core WireMock engine.<br />
          Embed in your test code, run as a standalone process, or deploy via
          Docker.
        </p>

        <div>
          <a href="#opensource" class="btn t-6">Learn more</a>
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          Cloud
        </h2>

        <div>
          <p>
            Web UI with team collaboration, OpenAPI + Swagger support, and chaos
            testing.
          </p>
          <p>Start on the generous free-forever tier:</p>
        </div>
        <div>
          <a
            href="https://www.wiremock.io/product?utm_source=wiremock.org&utm_medium=referral&utm_campaign=exp_hero"
            class="btn t-6 btn--inverse"
            >Get Started</a
          >
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        <h1>
          <a id="opensource"></a> Join The WireMock Community
        </h1>

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       <p>
         WireMock is community-driven, with user-contributed documentation and an active Slack community where all ideas and questions are welcome.
       </p>
       
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      <div class="home-header-hero-text whats-hot">
        <h2>
          <img src="/images/logos/doc-sections/loudspeaker.svg" alt="Image of a loud speaker" width="32px"/>&nbsp;
          What's <b style="color:red;">NEW</b>? <a href="https://docs.wiremock.io/data-sources/managing-data-sources/?utm_source=oss&utm_medium=oss&utm_campaign=oss-homepage-datasources&utm_id=oss-homepage-datasources&utm_term=oss-homepage-datasources&utm_content=oss-homepage-datasources" target="_BLANK">External data sources</a></h2>
        <p>
          Easily use data from a CSV file into your mock API calls.
        </p>
        <p>
          <a href="https://docs.wiremock.io/data-sources/managing-data-sources/?utm_source=oss&utm_medium=oss&utm_campaign=oss-homepage-datasources&utm_id=oss-homepage-datasources&utm_term=oss-homepage-datasources&utm_content=oss-homepage-datasources" target="_BLANK">
            <img alt="Image of WireMock Cloud data sources" src="{{ '/images/wiremock-cloud/datasources.png' | absolute_url }}">
          </a>
        </p>
        <p>
          Using external data with WireMock Cloud mock servers lets you quickly use updated test data without complex configuration, helping to guarantee your test sessions with our API mocks are realistic and simulate your application's production behavior.  <a href="https://docs.wiremock.io/data-sources/managing-data-sources/?utm_source=oss&utm_medium=oss&utm_campaign=oss-homepage-datasources&utm_id=oss-homepage-datasources&utm_term=oss-homepage-datasources&utm_content=oss-homepage-datasources" target="_BLANK">Learn more.</a>
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    <a id="a-wiremock-cloud" href="#wiremock-cloud-learn-more">z</a>
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        <h3 class="heading t-4">Rapidly create and Share API Mocks</h3>
        
        <ul class="mocklab-callout-bullets">
          <li>Intuitive UI for complex API mock creation</li>
          <li>For larger teams or API volume</li>
          <li>Easy start with OpenAPI, Swagger, Postman imports</li>
          <li>Pre-built templates for common industry APIs</li>
          <li>Enhance API resilience with negative and chaos testing</li>
          <li>Alerts for API mock and real API discrepancies</li>
          <li>RBAC, security, and event logs</li>
        </ul>

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            href="https://www.wiremock.io/product?utm_source=wiremock.org&utm_medium=referral&utm_campaign=homepage-callout_learn-more"
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            >Learn more</a
          >
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            href="https://app.wiremock.cloud/signup?utm_source=wiremock.org&utm_medium=referral&homepage-callout_try-it-now"
            class="btn btn--inverse t-6"
            >Sign Up for Free</a
          >
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  </div>

  <div class="key-features-wrapper">
    <div class="container">
      <h2 class="keyFeaturesTXT">Key Features</h2>
      <p class="keyFeaturesInfo">
        WireMock frees you from dependency on unstable APIs and allows you to
        develop with confidence. It's easy to launch a mock API server and
        simulate a host of real-world scenarios and APIs - including REST, SOAP,
        OAuth2 and more.
      </p>
      <div class="container key-features-grid">
        <div class="key-features-card">
          <div class="key-features__icon">
            <img
              src="{{ '/images/requestIcon.svg' | absolute_url }}"
              alt="Wiremock Features"
            />
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          <p>Advanced request matching</p>
        </div>
        <div class="key-features-card">
          <div class="key-features__icon">
            <img
              src="{{ '/images/responseIcon.svg' | absolute_url }}"
              alt="wiremock dynamic response"
            />
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          <p>Dynamic response templating</p>
        </div>
        <div class="key-features-card">
          <div class="key-features__icon">
            <img
              src="{{ '/images/unitTestIcon.svg' | absolute_url }}"
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          <p>
            Run in your unit tests, on your laptop or in your test environment.
          </p>
        </div>
        <div class="key-features-card">
          <div class="key-features__icon">
            <img
              src="{{ '/images/faultIcon.svg' | absolute_url }}"
              alt="wiremock fault and latency"
            />
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          <p>Fault and latency injection</p>
        </div>
        <div class="key-features-card">
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            <img
              src="{{ '/images/recordIcon.svg' | absolute_url }}"
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          <p>Record / Playback</p>
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              src="{{ '/images/httpIcon.svg' | absolute_url }}"
              alt="wiremock java, python, http"
            />
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          <p>Java, Python, HTTP and</p>
          <p>JSON file APIs</p>
        </div>
      </div>
      <a class="key-features__cta btn t-6" href="docs/">Full Documentation</a>
    </div>
  </div>
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    <h2 class="t-2">Downloads</h2>
    <p class="keyFeaturesInfo">
      WireMock is available as a standalone service, Java library and
      integrations for modern languages and technology stacks.
    </p>

    {% include downloads.html show_standalone="true" %}
  </div>

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      <h2 class="faq__title">Frequently Asked Questions</h2>

      <dl class="faq-list">
        <dt>What is WireMock? <i class="faq-list__icon"></i></dt>
        <dd>
          WireMock is a free API mocking tool that can be run as a standalone
          server, or in a hosted version via the
          <a href="https://wiremock.io/">WireMock Cloud</a> managed service.
        </dd>

        <dt>What is API mocking? <i class="faq-list__icon"></i></dt>
        <dd>
          API mocking involves creating a simple simulation of an API, accepting
          the same types of request and returning identically structured
          responses as the real thing, enabling fast and reliable development
          and testing.
        </dd>

        <dt>When do you need to mock APIs? <i class="faq-list__icon"></i></dt>
        <dd>
          API mocking is typically used during development and testing as it
          allows you to build your app without worrying about 3rd party APIs or
          sandboxes breaking. It can also be used to rapidly prototype APIs that
          don’t exist yet.
        </dd>

        <dt>How do you create an API mock? <i class="faq-list__icon"></i></dt>
        <dd>
          WireMock supports several approaches for creating mock APIs - in code,
          via its REST API, as JSON files and by recording HTTP traffic proxied
          to another destination.
        </dd>

        <dt>What makes WireMock unique? <i class="faq-list__icon"></i></dt>
        <dd>
          WireMock has a rich
          <a href="docs/request-matching/">matching system</a>, allowing any
          part of an incoming request to be matched against complex and precise
          criteria. Responses of any complexity can be dynamically generated via
          the Handlebars based templating system. Finally, WireMock is easy to
          integrate into any workflow due to its numerous
          <a href="docs/extending-wiremock/">extension points</a> and
          comprehensive APIs.
        </dd>

        <dt>Is WireMock open source? <i class="faq-list__icon"></i></dt>
        <dd>
          Yes, WireMock is a completely open source API mocking tool (<a
            href="https://github.com/wiremock/wiremock"
            >GitHub repo</a
          >). If you’re looking for a hosted version of WireMock, check out
          <a href="https://wiremock.io/">WireMock Cloud</a>.
        </dd>

        <dt>Is WireMock a free service? <i class="faq-list__icon"></i></dt>
        <dd>WireMock is completely free under the Apache 2.0 license.</dd>
      </dl>
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