Companies House API Overview

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d="M49.7,59.5c0,0-0.1,0.1-0.2,0.1c-0.4,0.4-0.9,0.8-1.5,1.1c-1.4,0.9-2.8,1.4-3.8,1.4c-0.1,0-0.3,0-0.5,0 c-1.1-0.1-2.5-0.3-3.9-0.7C38.4,61,37,60.5,36,59.9c-0.6,0.4-1.2,0.5-1.8,0.2C33.5,59.8,33,59,33,58.5c0-0.1,0-0.2,0-0.3 c-0.5-0.4-1-0.9-1.4-1.4c-0.2-0.2-0.3-0.4-0.5-0.6c-1.1-1.4-2-2.9-2.6-4.7c-0.3-0.9-0.6-1.9-0.8-2.8c1.2,0.4,1.8,0,2.1-0.4 c0.1,0,0.1,0.4,0.1,0.5c1.4,0,2.1-0.9,2.3-1.6c0.1,0.8,0.3,1.7,0.6,2.5c0.5,1.4,1.2,2.6,2.1,3.7c0.3,0.4,0.6,0.7,1,1 c0.2-0.1,0.4-0.1,0.7-0.1c0.5,0,1,0.2,1.4,0.7c0.4,0.4,0.6,1,0.5,1.5v0c2.4,1.1,5,2,7.2,2.6C47,59.4,48.6,59.7,49.7,59.5z"></path> <path fill="currentColor" fill-rule="evenodd" d="M47.1,19.4c0.4,0.8,0.7,1.2,0.7,1.8c0,0.6-0.7,1-1,1.6c-0.3-0.7-0.7-1.2-0.7-1.8C46.2,20.5,46.9,19.8,47.1,19.4z"></path> <path fill="currentColor" fill-rule="evenodd" d="M45.8,66.9c0,0.7-0.4,1.3-0.7,1.7c-0.2-0.4-0.3-0.7-0.6-0.7c-0.5,0-0.2,2.3-1.6,2.3c0.1,0.1,0.1,0.2,0.1,0.4 c0,0.6-0.5,1-1,1c-0.6,0-1-0.5-1-1c0-0.1,0-0.2,0.1-0.4c-1.3-0.1-1.1-2.3-1.6-2.3c-0.2,0-0.4,0.3-0.6,0.7c-0.3-0.4-0.7-1-0.7-1.7 c0-0.7,0.6-1.5,1.5-1.5c0.2,0,0.3,0,0.5,0.1v-3.2c1.3,0.3,2.5,0.5,3.6,0.6c0,0,0.1,0,0.2,0v2.6c0.1,0,0.3-0.1,0.4-0.1 C45.2,65.4,45.8,66.2,45.8,66.9z"></path> <path fill="currentColor" fill-rule="evenodd" d="M44,8.4v2.4c-0.4-0.5-1.1-0.9-1.6-1c0.1,0.6,0.5,1.2,1,1.5h-2.5c0.5-0.4,0.9-0.9,1-1.5c-0.6,0.1-1.3,0.5-1.7,1V8.4 c0.4,0.5,1.1,0.9,1.7,1c-0.1-0.6-0.4-1.1-1-1.7h2.4c-0.5,0.6-0.9,1.1-0.9,1.7C42.9,9.2,43.6,8.8,44,8.4z"></path> <path fill="currentColor" fill-rule="evenodd" d="M37.8,21c0,0.5-0.4,1.1-0.7,1.8c-0.3-0.6-0.9-1-1-1.6c0-0.6,0.3-1,0.7-1.8C37,19.8,37.7,20.5,37.8,21z"></path> <path fill="currentColor" fill-rule="evenodd" d="M34.7,67.2c0,0.5-0.2,0.9-0.6,1.3c-0.4,0.3-1,0.7-1.6,1c-0.2,0.1-0.3,0.2-0.5,0.2c-0.7,0.3-1,0.5-1.1,1l-2.4,0.2 c-0.1-0.1-0.1-0.3-0.2-0.4c-0.4-0.8-0.7-1.5-0.7-2.3c0-1.1,0.6-1.6,1.3-2.2c0.2-0.2,0.5-0.4,0.7-0.7c-2.4,0.2-4.8,1.9-7.2,3.5 c-1.2,0.8-2.5,1.7-3.7,2.3c-1.4,0.7-2.6,1.1-3.7,1.1c-1.1,0-2.2-0.8-3.3-1.7c-0.8-0.6-1.6-1.2-2.5-1.7c-0.1-0.1-0.2-0.2-0.1-0.3 c0-0.1,0.1-0.2,0.2-0.2c0,0,0.1,0,0.1,0c3,0.9,6.8-1.6,10.5-4.1c2.6-1.8,5.1-3.4,7.4-3.9c0.4-0.1,0.7-0.1,1.1-0.1 c0.9,0,1.7,0.2,2.4,0.6c0.9,0.5,1.5,1.2,1.9,2.2c0.4,1,0.9,1.7,1.2,2.3C34.4,66.1,34.7,66.6,34.7,67.2z"></path> </svg> <span class="govuk-header__logotype-text"> Companies House</span> </span> </a> </div> <div class="govuk-header__content"> <a class="govuk-header__link govuk-header__link--service-name" href="/"> Developer Hub </a> </div> </div> </div> </header> <div class="govuk-width-container"> <div class="js-toggle-nav" id="global-nav"> <nav class="content"> <div> <ul class="mobile-hidden" id="navigation"> <li><a class="piwik-event govuk-link" data-event-id="Sign In" href="/signin" id="user-signin">Sign in / Register</a></li> <li><a class="govuk-link" href="https://forum.aws.chdev.org/">Developer forum</a></li> </ul> </div> </nav> </div> <div>  <main class="govuk-main-wrapper" id="main-content"> <div class="govuk-grid-row"> <div class="govuk-grid-column-one-third"> <nav class="app-subnav app-hide-mobile"> <h4 class="app-subnav__theme">General documentation</h4> <ul class="app-subnav__section"> <li class="app-subnav__section-item"> <a class="app-subnav__link govuk-link" href="/">Companies House API overview</a> </li> <li class="app-subnav__section-item"> <a class="app-subnav__link govuk-link" href="/get-started">Get started</a> </li> <li class="app-subnav__section-item"> <a class="app-subnav__link govuk-link" href="/overview">Companies House REST API</a> </li> <li class="app-subnav__section-item"> <a class="app-subnav__link govuk-link" href="/how-to-create-an-application">How to create an application</a> </li> <li class="app-subnav__section-item"> <a class="app-subnav__link govuk-link" href="/authentication">API authentication</a> </li> <li class="app-subnav__section-item"> <a class="app-subnav__link govuk-link" href="/developer-guidelines">Developer guidelines</a> </li> <li class="app-subnav__section-item"> <a class="app-subnav__link govuk-link" href="/api-testing">API testing</a> </li> </ul> <h4 class="app-subnav__theme">API specifications</h4> <ul class="app-subnav__section"> <li class="app-subnav__section-item"> <a class="app-subnav__link govuk-link" href="https://developer-specs.company-information.service.gov.uk">API specifications list</a> </li> </ul> </nav> </div> <div class="govuk-grid-column-two-thirds"> <div id="temp-home-main-content"> <h1 class="govuk-heading-xl">Companies House REST API</h1> <section> <p class="govuk-body">The Companies House API is a REST API that provides a simple, consistent approach to requesting and modifying data. REST stands for Representational State Transfer which is an architectural software style in which standard HTTP request methods are used to retrieve and modify representations of data. This is identical to the process of retrieving a web page or submitting a web form. </p> <p class="govuk-body">Previous versions of the Companies House API implemented an XML-RPC style of interface. Data was retrieved or submitted by POSTing XML documents to the service. Each version defined the method to be called and the data to be processed. </p> <p class="govuk-body">The difference between both API approaches is explained below. </p> </section> <section id="rest"> <h2 class="govuk-heading-l">Representational State Transfer (REST) web services</h2> <p class="govuk-body">In a RESTful style of API, data resources are allocated unique URLs and manipulated through standard HTTP verbs such as: </p> <ol class="govuk-list govuk-list--bullet"> <li><code>GET</code> to request a resource</li> <li><code>POST</code> to create a resource</li> <li><code>PUT</code> to change a resource</li> <li><code>DELETE</code> to remove a resource</li> </ol> <p class="govuk-body">In contrast to the above XML-RPC examples, the same RESTful API request for a <code>customer</code> record would be: </p> <pre class="request"><span class="request">GET <span class="string">https://api.example.domain/customer/12345</span> HTTP/1.1</span></pre> <p class="govuk-body">The resource request is made using the <code>GET</code> method with no request body. </p> <p class="govuk-body">In a RESTful API, a resource is modified by POSTing a revised resource representation, in this case JSON, to the same resource URL: </p> <pre><code><span class="request">POST <span class="string">https://api.example.domain/customer/12345</span> HTTP/1.1</span></code></pre> <pre><code class="http">Content-Type: <span class="string">text/json</span></code></pre> <pre><code class="http">{ "CustomerName": <span class="string">"Joe Bloggs"</span>, "Address"     : <span class="string">""</span>, "etc"         : <span class="string">"etc"</span> }</code></pre> <p class="govuk-body"> Similarly, a resource may be deleted by sending a <code>DELETE</code> request to the resource URL: </p> <pre><code><span class="request">DELETE <span class="string">https://api.example.domain/customer/12345</span> HTTP/1.1</span></code></pre> <p class="govuk-body">REST uses the existing features of the HTTP protocol and does not permit the designer to define application specific operations. Also, because each resource has a globally unique URI and is able to make use of the <code>GET</code> method for resource requests, these APIs benefit from existing network components such as caches, proxies and intelligent routing. </p> </section> <section id="json"> <h2 class="govuk-heading-l">The JSON data format</h2> <p class="govuk-body">JSON, or JavaScript Object Notation, is an open, standard format for storing and exchanging data. It is easier to use than XML and more compact. It can be used as a data format by any programming language, which makes it ideal for HTTP-based API services. </p> </section> <section id="api-specs"> <h2 class="govuk-heading-l">API specifications</h2> <p class="govuk-body">The API specifications list in the <a class="govuk-link" href="https://developer-specs.company-information.service.gov.uk/"> Developer's API suite</a> documents all of the available Companies House public API operations, from reading public company data to submitting a data change for a specific company. </p> <p class="govuk-body">API specifications for all Companies House public API operations are documented using <a class="govuk-link" href="https://en.wikipedia.org/wiki/OpenAPI_Specification"> OpenAPI specifications</a>. </p> </section> </div> </div> </div> </main>  </div> </div> <footer class="govuk-footer " id="footer"> <div class="govuk-width-container "> <nav class="app-subnav app-hide-mobile"> <div class="govuk-footer__meta"> <div class="govuk-footer__meta-item govuk-footer__meta-item--grow"> <h2 class="govuk-visually-hidden">Support links</h2> <ul class="govuk-footer__inline-list"> <li class="govuk-footer__inline-list-item"> <a class="govuk-footer__link" href="http://www.companieshouse.gov.uk/legal/termsAndConditions.shtml"> Policies </a> </li> <li class="govuk-footer__inline-list-item"> <a class="govuk-footer__link" href="https://find-and-update.company-information.service.gov.uk/help/cookies"> Cookies </a> </li> <li class="govuk-footer__inline-list-item"> <a class="govuk-footer__link" href="https://forum.aws.chdev.org/"> Forum </a> </li> <li class="govuk-footer__inline-list-item"> <a class="govuk-footer__link" href="https://find-and-update.company-information.service.gov.uk/help/contact-us"> Contact us </a> </li> </ul> <svg class="govuk-footer__licence-logo" focusable="false" height="17" viewBox="0 0 483.2 195.7" width="41" xmlns="http://www.w3.org/2000/svg"> <path d="M421.5 142.8V.1l-50.7 32.3v161.1h112.4v-50.7zm-122.3-9.6A47.12 47.12 0 0 1 221 97.8c0-26 21.1-47.1 47.1-47.1 16.7 0 31.4 8.7 39.7 21.8l42.7-27.2A97.63 97.63 0 0 0 268.1 0c-36.5 0-68.3 20.1-85.1 49.7A98 98 0 0 0 97.8 0C43.9 0 0 43.9 0 97.8s43.9 97.8 97.8 97.8c36.5 0 68.3-20.1 85.1-49.7a97.76 97.76 0 0 0 149.6 25.4l19.4 22.2h3v-87.8h-80l24.3 27.5zM97.8 145c-26 0-47.1-21.1-47.1-47.1s21.1-47.1 47.1-47.1 47.2 21 47.2 47S123.8 145 97.8 145" fill="currentColor"></path> </svg> <span class="govuk-footer__licence-description"> All content is available under the <a class="govuk-footer__link" href="https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/" rel="license" >Open Government Licence v3.0</a>, except where otherwise stated </span> </div> <div class="govuk-footer__meta-item"> <a class="govuk-footer__link govuk-footer__copyright-logo" href="https://www.nationalarchives.gov.uk/information-management/re-using-public-sector-information/uk-government-licensing-framework/crown-copyright/" >© Crown copyright</a> </div> </div> </nav> </div> </footer> <script src="//d1n5k7a21n8ko0.cloudfront.net/javascripts/app/body-js-enable.js"></script> <script src="//d1n5k7a21n8ko0.cloudfront.net/javascripts/vendor/require.js"></script> <script src="//d1n5k7a21n8ko0.cloudfront.net/javascripts/vendor/jquery-3.3.1.min.js"></script> <script src="//d1n5k7a21n8ko0.cloudfront.net/javascripts/app/govuk-frontend-2.12.0.min.js"></script> <script src="//d1n5k7a21n8ko0.cloudfront.net/javascripts/app/js-enable.js"></script> <script src="//d1n5k7a21n8ko0.cloudfront.net/javascripts/app/radio-buttons.js"></script> <script src="//d1n5k7a21n8ko0.cloudfront.net/javascripts/app/cookie-consent/cookie-consent-1.0.0.js" type="text/javascript"></script> <script src="//d1n5k7a21n8ko0.cloudfront.net/javascripts/app/cookie-consent/piwik-only-cookie-consent.js" type="text/javascript"></script> </body> </html>

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Companies House API Overview