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<!doctype html>
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<title data-rh="true">Perspective</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://perspective-dev.github.io/"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docusaurus_tag" content="default"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docsearch:docusaurus_tag" content="default"><meta data-rh="true" property="og:title" content="Perspective"><link data-rh="true" rel="icon" href="https://openjsf.org/favicon.ico"><link data-rh="true" rel="canonical" href="https://perspective-dev.github.io/"><link data-rh="true" rel="alternate" href="https://perspective-dev.github.io/" hreflang="en"><link data-rh="true" rel="alternate" href="https://perspective-dev.github.io/" hreflang="x-default"><script data-rh="true">function insertBanner(){var n=document.createElement("div");n.id="__docusaurus-base-url-issue-banner-container";n.innerHTML='\n<div id="__docusaurus-base-url-issue-banner" style="border: thick solid red; background-color: rgb(255, 230, 179); margin: 20px; padding: 20px; font-size: 20px;">\n <p style="font-weight: bold; font-size: 30px;">Your Docusaurus site did not load properly.</p>\n <p>A very common reason is a wrong site <a href="https://docusaurus.io/docs/docusaurus.config.js/#baseUrl" style="font-weight: bold;">baseUrl configuration</a>.</p>\n <p>Current configured baseUrl = <span style="font-weight: bold; color: red;">/</span> (default value)</p>\n <p>We suggest trying baseUrl = <span id="__docusaurus-base-url-issue-banner-suggestion-container" style="font-weight: bold; color: green;"></span></p>\n</div>\n',document.body.prepend(n);var e=document.getElementById("__docusaurus-base-url-issue-banner-suggestion-container"),s=window.location.pathname,o="/"===s.substr(-1)?s:s+"/";e.innerHTML=o}document.addEventListener("DOMContentLoaded",function(){void 0===window.docusaurus&&insertBanner()})</script><link rel="stylesheet" href="/assets/css/styles.4f443630.css">
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<script>!function(){var t=function(){try{return new URLSearchParams(window.location.search).get("docusaurus-theme")}catch(t){}}()||function(){try{return window.localStorage.getItem("theme")}catch(t){}}();document.documentElement.setAttribute("data-theme",t||"dark"),document.documentElement.setAttribute("data-theme-choice",t||"dark")}(),function(){try{const c=new URLSearchParams(window.location.search).entries();for(var[t,e]of c)if(t.startsWith("docusaurus-data-")){var a=t.replace("docusaurus-data-","data-");document.documentElement.setAttribute(a,e)}}catch(t){}}()</script><div id="__docusaurus"><div class="header-center header-shift"><div role="region" aria-label="Skip to main content"><a class="skipToContent_Q_9i" href="#__docusaurus_skipToContent_fallback">Skip to main content</a></div><nav aria-label="Main" class="theme-layout-navbar navbar navbar--fixed-top"><div class="navbar__inner"><div class="theme-layout-navbar-left navbar__items"><button aria-label="Toggle navigation bar" aria-expanded="false" class="navbar__toggle clean-btn" type="button"><svg width="30" height="30" viewBox="0 0 30 30" aria-hidden="true"><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></button><a class="navbar__brand" href="/"><div class="navbar__logo"><img src="/svg/perspective-logo-light.svg" alt="Perspective" class="themedComponent_xk3r themedComponent--light_AOFg"><img src="/svg/perspective-logo-light.svg" alt="Perspective" class="themedComponent_xk3r themedComponent--dark_lAB1"></div></a></div><div class="theme-layout-navbar-right navbar__items navbar__items--right"><div class="navbar__item dropdown dropdown--hoverable dropdown--right"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Docs</a><ul class="dropdown__menu"><li class=""><a class="dropdown__link" style="font-size:16px;padding:0.25rem 0rem" href="/guide/">User Guide</a></li><li class=""><span style="user-select:none">Python API</span></li><li class=""><a class="dropdown__link" href="/python/"><code>perspective</code></a></li><li class=""><a class="dropdown__link" href="/python/perspective/widget.html"><code>perspective.widget</code></a></li><li class=""><a class="dropdown__link" href="/python/perspective/handlers/aiohttp.html"><code>perspective.handlers.aiohttp</code></a></li><li class=""><a class="dropdown__link" href="/python/perspective/handlers/starlette.html"><code>perspective.handlers.starlette</code></a></li><li class=""><a class="dropdown__link" href="/python/perspective/handlers/tornado.html"><code>perspective.handlers.tornado</code></a></li><li class=""><span style="user-select:none">JavaScript API</span></li><li class=""><a class="dropdown__link" href="/browser/modules/src_ts_perspective.browser.ts.html"> <code>@perspective-dev/client</code> Browser</a></li><li class=""><a class="dropdown__link" href="/node/modules/src_ts_perspective.node.ts.html"> <code>@perspective-dev/client</code> Node.js</a></li><li class=""><a class="dropdown__link" href="/viewer/modules/perspective-viewer.html"> <code>@perspective-dev/viewer</code></a></li><li class=""><a class="dropdown__link" href="/react/index.html"> <code>@perspective-dev/react</code></a></li><li class=""><span style="user-select:none">Rust API</span></li><li class=""><a class="dropdown__link" href="https://docs.rs/perspective/latest/perspective/"><code>perspective</code></a></li><li class=""><a class="dropdown__link" href="https://docs.rs/perspective-client/latest/perspective_client/"><code>perspective-client</code></a></li><li class=""><a class="dropdown__link" href="https://docs.rs/perspective-server/latest/perspective_server/"><code>perspective-server</code></a></li><li class=""><a class="dropdown__link" href="https://docs.rs/perspective-js/latest/perspective_js/"><code>perspective-js</code></a></li><li class=""><a class="dropdown__link" href="https://docs.rs/perspective-python/latest/perspective_python/"><code>perspective-python</code></a></li><li class=""><a class="dropdown__link" href="https://docs.rs/perspective-viewer/latest/perspective_viewer/"><code>perspective-viewer</code></a></li></ul></div><a class="navbar__item navbar__link" href="/examples/">Examples</a><a href="https://github.com/perspective-dev/perspective" target="_blank" rel="noopener noreferrer" class="navbar__item navbar__link">GitHub<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_m07b"><use href="#theme-svg-external-link"></use></svg></a><div class="toggle_oqiV colorModeToggle_zCJm"><button class="clean-btn toggleButton_AR1n toggleButtonDisabled_sTWs" type="button" disabled="" title="system mode" aria-label="Switch between dark and light mode (currently system mode)"><svg viewBox="0 0 24 24" width="24" height="24" aria-hidden="true" class="toggleIcon_niRn lightToggleIcon_NKcQ"><path fill="currentColor" d="M12,9c1.65,0,3,1.35,3,3s-1.35,3-3,3s-3-1.35-3-3S10.35,9,12,9 M12,7c-2.76,0-5,2.24-5,5s2.24,5,5,5s5-2.24,5-5 S14.76,7,12,7L12,7z M2,13l2,0c0.55,0,1-0.45,1-1s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S1.45,13,2,13z M20,13l2,0c0.55,0,1-0.45,1-1 s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S19.45,13,20,13z M11,2v2c0,0.55,0.45,1,1,1s1-0.45,1-1V2c0-0.55-0.45-1-1-1S11,1.45,11,2z M11,20v2c0,0.55,0.45,1,1,1s1-0.45,1-1v-2c0-0.55-0.45-1-1-1C11.45,19,11,19.45,11,20z M5.99,4.58c-0.39-0.39-1.03-0.39-1.41,0 c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0s0.39-1.03,0-1.41L5.99,4.58z M18.36,16.95 c-0.39-0.39-1.03-0.39-1.41,0c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0c0.39-0.39,0.39-1.03,0-1.41 L18.36,16.95z M19.42,5.99c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06c-0.39,0.39-0.39,1.03,0,1.41 s1.03,0.39,1.41,0L19.42,5.99z M7.05,18.36c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06 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class="navbarSearchContainer_TsHz"></div></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div></nav><div id="__docusaurus_skipToContent_fallback" class="theme-layout-main main-wrapper mainWrapper_dx1z"><header class="hero heroBanner_qdFl"><div class="container"><div class="buttons_AeoN"></div></div></header><main><section class="features_t9lD"><div class="container_a30C"><div class="row"><hr><br><br><br><div class=""><div class="text--full padding-horiz--md"><div><h2 id="what-is-perspective">What is Perspective?</h2>
<p>Perspective is an <i>interactive</i> analytics and data visualization component,
which is especially well-suited for <i>large</i> and/or <i>streaming</i>
datasets. Use it to create user-configurable reports, dashboards, notebooks and
applications, then deploy stand-alone in the browser, or in concert with Python
and/or <a href="https://jupyterlab.readthedocs.io/en/stable/">Jupyterlab</a>.</p><br><h3>Features</h3><br><div class="feature_CLW0"><svg xmlns="http://www.w3.org/2000/svg" width="53" height="67" fill="none" viewBox="0 0 53 67" class="featureSvg_GfXr"><path d="M11.648 1.56 1.611 11.244A2 2 0 0 0 1 12.683V64a2 2 0 0 0 2 2h47a2 2 0 0 0 2-2V50.447c0-.775-.628-1.404-1.404-1.404a1.404 1.404 0 0 1-1.403-1.403v-8.497c0-.775.628-1.404 1.403-1.404.776 0 1.404-.628 1.404-1.403V3a2 2 0 0 0-2-2H13.037a2 2 0 0 0-1.389.56"></path><path d="M29.24 29h-8.675L16 43.431h8.217L21.478 56 37 38.776H26.044zM42 8h3v11h-3zM36 8h3v11h-3zM31 8h3v11h-3zM25 8h3v11h-3zM19 8h3v11h-3zM14 8h3v11h-3zM8 14h3v8H8z"></path></svg><p>A fast, memory efficient streaming query engine, written in
C++ and compiled for both <a href="https://webassembly.org/">WebAssembly</a> and
<a href="https://www.python.org/">Python</a>, with read/write/streaming for
<a href="https://arrow.apache.org/">Apache Arrow</a>, and a high-performance columnar
expression language based on <a href="https://github.com/ArashPartow/exprtk">ExprTK</a>.</p></div><div class="feature_CLW0"><svg xmlns="http://www.w3.org/2000/svg" width="49" height="71" fill="none" viewBox="0 0 49 71" class="featureSvg_GfXr"><path d="M1 23.5 24.335 6.166 47.668 23.5 24.335 40.835zM9 41.5l-8 5.834L24.335 64.67l23.334-17.334-8.017-5.956"></path><path d="m9 29.5-8 5.834L24.335 52.67l23.334-17.334-8.017-5.956"></path></svg><p>A framework-agnostic User Interface packaged as a
<a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements">Custom Element</a>,
powered either in-browser via WebAssembly or virtually via
WebSocket server (Python/Node).</p></div><div class="feature_CLW0"><svg xmlns="http://www.w3.org/2000/svg" width="48" height="59" fill="none" viewBox="0 0 48 59" class="featureSvg_GfXr"><rect width="45" height="57" x="2" y="1" rx="2"></rect><circle cx="10" cy="11" r="2" fill="#666"></circle><circle cx="10" cy="30" r="2" fill="#666"></circle><circle cx="10" cy="49" r="2" fill="#666"></circle><path d="M10 11H0M39 10H17M39 14H17M39 18H17M39 22H17M39 26H17M39 30H17M39 34H17M39 38H17M39 42H17M39 46H17M39 50H17M10 30H0M10 49H0"></path></svg><p>A <a href="https://jupyter.org/">JupyterLab</a> widget and Python client library, for
interactive data analysis in a notebook, as well as <em>scalable</em> production
<a href="https://github.com/voila-dashboards/voila">Voila</a> applications.</p></div></div></div></div><hr><br><br><br><div class=""><div class="text--full padding-horiz--md"><h2 id="javascript">JavaScript</h2>
<p>Interactive dashboards built on Perspective.js
<a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements">Custom Elements</a>
are easy to integrate into any web application framework.</p>
<p>Using Perspective's simple query language, elements like
<code><perspective-viewer></code> can be <em>symmetrically</em> configured via API or User
interaction. Web Applications built with Perspective Custom Elements can be
re-hydrated from their serialized state, driven from external Events, or
persisted to any store. Workspaces can mix virtual, server-side Python data
with in-browser client data seamlessly, and independent data Views can be
cross-filtered, duplicated, exported, stacked and saved.</p>
<p>To achieve Desktop-like performance in the Browser, Perspective.js
relies on <a href="https://webassembly.org/">WebAssembly</a> for excellent
<em>query calculation</em> time, and <a href="https://arrow.apache.org/">Apache Arrow</a>
for its conservative <em>memory footprint</em> and efficient <em>data serialization</em>.</p></div></div><hr><br><br><br><div class=""><div class="text--full padding-horiz--md"><h2 id="python">Python</h2>
<p>`perspective-python`, built on the same C++ data engine used by the
<a href="https://perspective-dev.github.io/docs/md/js.html">WebAssembly version</a>,
implements the Perspective API directly in Python, either as a virtualized
server for Production, or as an embedded JupyterLab Widget for Research.</p>
<p>For Application Developers, virtualized <code><perspective-viewer></code> will only consume
the data necessary to render the current screen, enabling <em>ludicrous size</em>
datasets with nearly instant load. Or - efficiently stream the entire dataset to
the WebAssembly runtime via Apache Arrow, and give your server a break!</p>
<p>For Researchers and Data Scientists, <code>PerspectiveWidget</code> is available as a
<a href="https://jupyterlab.readthedocs.io/en/stable/">Jupyter/JupyterLab</a> widget,
allowing interactive <a href="https://pandas.pydata.org/">Pandas</a> and
<a href="https://arrow.apache.org/">Apache Arrow</a> visualization within a notebook.</p></div></div></div><br><hr></div></section><section class="gallerySection_Wpmb features_t9lD"><div class="gallery_OZR8 container"><hr></div></section></main></div><footer class="theme-layout-footer footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="margin-bottom--sm"><a href="ttps://openjsf.org/" rel="noopener noreferrer" class="footerLogoLink_Yqtv"><img src="/img/openjs_foundation-logo-horizontal-black.png" alt="OpenJS Foundation Logo" class="footer__logo themedComponent_xk3r themedComponent--light_AOFg" width="160" height="51"><img src="/img/openjs_foundation-logo-horizontal-white.png" alt="OpenJS Foundation Logo" class="footer__logo themedComponent_xk3r themedComponent--dark_lAB1" width="160" height="51"></a></div><div class="footer__copyright"><br><br>Copyright © 2017 OpenJS Foundation and Perspective contributors.<br><br> All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.<br><br><p><a href="https://openjsf.org">The OpenJS Foundation</a> | <a href="https://terms-of-use.openjsf.org">Terms of Use</a> | <a href="https://privacy-policy.openjsf.org">Privacy Policy</a> | <a href="https://bylaws.openjsf.org">Bylaws</a> | <a href="https://code-of-conduct.openjsf.org">Code of Conduct</a> | <a href="https://trademark-policy.openjsf.org">Trademark Policy</a> | <a href="https://trademark-list.openjsf.org">Trademark List</a> | <a href="https://www.linuxfoundation.org/cookies">Cookie Policy</a></p></div></div></div></footer></div></div>
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