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track-type="languageSelector"> <option>Language</option> <option value="en" lang="en" track-metadata-original-language="en" track-metadata-selected-language="en" track-name="changed" track-type="languageSelector"> English </option> <option value="id" lang="id" track-metadata-original-language="en" track-metadata-selected-language="id" track-name="changed" track-type="languageSelector"> Bahasa Indonesia </option> <option value="de" lang="de" track-metadata-original-language="en" track-metadata-selected-language="de" track-name="changed" track-type="languageSelector"> Deutsch </option> <option value="es_419" lang="es_419" track-metadata-original-language="en" track-metadata-selected-language="es_419" track-name="changed" track-type="languageSelector"> Español – América Latina </option> <option value="fr" lang="fr" track-metadata-original-language="en" track-metadata-selected-language="fr" track-name="changed" track-type="languageSelector"> Français </option> <option value="it" lang="it" track-metadata-original-language="en" track-metadata-selected-language="it" track-name="changed" track-type="languageSelector"> Italiano </option> <option value="pl" lang="pl" track-metadata-original-language="en" track-metadata-selected-language="pl" track-name="changed" track-type="languageSelector"> Polski </option> <option value="pt_br" lang="pt_br" track-metadata-original-language="en" track-metadata-selected-language="pt_br" track-name="changed" track-type="languageSelector"> Português – Brasil </option> <option value="vi" lang="vi" track-metadata-original-language="en" track-metadata-selected-language="vi" track-name="changed" track-type="languageSelector"> Tiếng Việt </option> <option value="tr" lang="tr" track-metadata-original-language="en" track-metadata-selected-language="tr" track-name="changed" track-type="languageSelector"> Türkçe </option> <option value="ru" lang="ru" track-metadata-original-language="en" track-metadata-selected-language="ru" track-name="changed" track-type="languageSelector"> Русский </option> <option value="he" lang="he" track-metadata-original-language="en" track-metadata-selected-language="he" track-name="changed" track-type="languageSelector"> עברית' </option> <option value="ar" lang="ar" track-metadata-original-language="en" track-metadata-selected-language="ar" track-name="changed" track-type="languageSelector"> العربيّة </option> <option value="fa" lang="fa" track-metadata-original-language="en" track-metadata-selected-language="fa" track-name="changed" track-type="languageSelector"> فارسی </option> <option value="hi" lang="hi" track-metadata-original-language="en" track-metadata-selected-language="hi" track-name="changed" track-type="languageSelector"> हिंदी </option> <option value="bn" lang="bn" track-metadata-original-language="en" track-metadata-selected-language="bn" track-name="changed" track-type="languageSelector"> বাংলা </option> <option value="th" lang="th" track-metadata-original-language="en" track-metadata-selected-language="th" track-name="changed" track-type="languageSelector"> ภาษาไทย </option> <option value="zh_cn" lang="zh_cn" track-metadata-original-language="en" track-metadata-selected-language="zh_cn" track-name="changed" track-type="languageSelector"> 中文 – 简体 </option> <option value="zh_tw" lang="zh_tw" track-metadata-original-language="en" track-metadata-selected-language="zh_tw" track-name="changed" track-type="languageSelector"> 中文 – 繁體 </option> <option value="ja" lang="ja" track-metadata-original-language="en" track-metadata-selected-language="ja" track-name="changed" track-type="languageSelector"> 日本語 </option> <option value="ko" lang="ko" track-metadata-original-language="en" track-metadata-selected-language="ko" track-name="changed" track-type="languageSelector"> 한국어 </option> </select> </devsite-select> </devsite-language-selector> <a class="devsite-header-link devsite-top-button button gc-analytics-event" href="//web.archive.org/web/20210114082206/https://console.firebase.google.com/" data-category="Site-Wide Custom Events" data-label="Site header link"> Go to console </a> <devsite-user enable-profiles fp-auth id="devsite-user"></devsite-user> </div> </div> </div> <div class="devsite-collapsible-section devsite-header-no-lower-tabs "> <div class="devsite-header-background"> <div class="devsite-product-id-row"> <div class="devsite-product-description-row"> <ul class="devsite-breadcrumb-list"> <li class="devsite-breadcrumb-item "> <a href="https://web.archive.org/web/20210114082206/https://firebase.google.com/products-build" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Lower Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail=""> Products </a> </li> </ul> </div> </div> </div> </div> </div> </devsite-header> <devsite-book-nav scrollbars hidden> <nav class="devsite-book-nav devsite-nav nocontent" aria-label="Side menu"> <div class="devsite-mobile-header"> <button type="button" id="devsite-close-nav" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Close navigation" aria-label="Close navigation"> </button> <div class="devsite-product-name-wrapper"> <a href="/web/20210114082206/https://firebase.google.com/" class="devsite-site-logo-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Site logo" track-type="globalNav" track-name="firebase" track-metadata-position="nav" track-metadata-eventdetail="nav"> <img src="https://web.archive.org/web/20210114082206im_/https://www.gstatic.com/devrel-devsite/prod/v45f61267e22826169cf5d5f452882f7812c8cfb5f8b103a48c0d88727908b295/firebase/images/lockup.png" class="devsite-site-logo" alt="Firebase"> </a> <span class="devsite-product-name"> <ul class="devsite-breadcrumb-list"> <li class="devsite-breadcrumb-item "> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/web/20210114082206/https://firebase.google.com/products-build" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Products" track-type="globalNav" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="products"> <span class="devsite-nav-text" tooltip> Products </span> <span class="devsite-nav-icon material-icons" data-icon="forward"> </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip> <span class="devsite-nav-text" tooltip menu="Products"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Products"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/web/20210114082206/https://firebase.google.com/use-cases" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Use Cases" track-type="globalNav" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="useCases"> <span class="devsite-nav-text" tooltip> Use Cases </span> <span class="devsite-nav-icon material-icons" data-icon="forward"> </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210114082206/https://firebase.google.com/pricing" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Pricing" track-type="globalNav" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="pricing"> <span class="devsite-nav-text" tooltip> Pricing </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210114082206/https://firebase.google.com/docs" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Docs" track-type="globalNav" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="docs"> <span class="devsite-nav-text" tooltip> Docs </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210114082206/https://firebase.google.com/community" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Community" track-type="globalNav" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="community"> <span class="devsite-nav-text" tooltip> Community </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210114082206/https://firebase.google.com/support" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Support" track-type="globalNav" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="support"> <span class="devsite-nav-text" tooltip> Support </span> <span class="devsite-nav-icon material-icons" data-icon="forward"> </span> </a> </li> <li class="devsite-nav-item"> <a href="//web.archive.org/web/20210114082206/https://console.firebase.google.com/" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Go to console" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="goToConsole"> <span class="devsite-nav-text" tooltip> Go to console </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom" role="navigation"> <ul class="devsite-nav-list" menu="Products" aria-label="Side menu" hidden> <li class="devsite-nav-item"> <a href="/web/20210114082206/https://firebase.google.com/products-build" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Build" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="build"> <span class="devsite-nav-text" tooltip> Build </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210114082206/https://firebase.google.com/products-release" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Release & Monitor" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="release&Monitor"> <span class="devsite-nav-text" tooltip> Release & Monitor </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210114082206/https://firebase.google.com/products-engage" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Engage" track-type="navMenu" track-metadata-eventdetail="globalMenu" 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.devsite-banner-announcement:not(.devsite-banner-tenant) { background: #202124; color: white; font-weight: 500; } .devsite-banner-announcement a { color: white; font-weight: 700; } .devsite-banner-announcement a:link, .devsite-banner-announcement a:visited { background: 0; } .devsite-banner-announcement a:hover, .devsite-banner-announcement a:focus { text-decoration: none; } .devsite-banner-announcement .devsite-banner-message-text { margin: 0 auto; } </style> Google is committed to advancing racial equity for Black communities. <a href="https://web.archive.org/web/20210114082206/https://google.com/racialequity" class="gc-analytics-event" data-category="Announcement" data-label="Racial Equity">See how.</a> </div> </div> </div> <div class="devsite-article-meta" role="navigation"> <ul class="devsite-breadcrumb-list" aria-label="Breadcrumb"> <li class="devsite-breadcrumb-item "> <a href="https://web.archive.org/web/20210114082206/https://firebase.google.com/" 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track-name="sendFeedbackLink" track-metadata-position="header" project-feedback-url="https://firebase.google.com/support/contact/bugs-features/" project-icon="https://firebase.google.com/_static/firebase/images/logo.png" project-support-url="https://firebase.google.com/support/" feedback-type="star-rating"> <button> Send feedback </button> </devsite-feedback> <devsite-toc class="devsite-nav" devsite-toc-embedded disabled> </devsite-toc> <div class="devsite-article-body clearfix devsite-no-page-title"> <main> <div class="firesite__bg firesite__bg--desktop" aria-hidden="true"> <img src="/web/20210114082206im_/https://firebase.google.com/images/backgrounds/product-detail-bgs/background-rt-db.svg" alt="" role="presentation"/> </div>  <section id="store-and-sync-data-in-real-time" class="product-header product-header--realtime-db"> <header class="product-header__wrapper"> <div class="product-header__content"> <h5 class="product-header__name light no-link" id="firebase-realtime-database" data-text=" Firebase Realtime Database "> Firebase Realtime Database </h5> <h1 id="store-and-sync-data-in-real-time" data-text="Store and sync data in real time">Store and sync <br>data in real time</h1> <div class="product-header__ctas"> <a href="https://web.archive.org/web/20210114082206/https://console.firebase.google.com/u/0/project/_/database/data" data-category="getStarted" data-action="linkClick" data-label="hero" class="cta-button cta-button--white gc-analytics-event"> Visit console </a> <a href="/web/20210114082206/https://firebase.google.com/docs/database" data-category="viewDocs" data-action="linkClick" data-label="hero" class="cta-link cta-link--with-icon cta-link--white gc-analytics-event"> <i class="material-icons" aria-hidden="true" translate="no">subject</i> View docs </a> </div> </div> <div class="product-header__illo" role="presentation" aria-hidden="true"> <img srcset="https://web.archive.org/web/20210114082206im_/https://firebase.google.com/images/products/realtime-database/database-illo_2x.png 2x, https://web.archive.org/web/20210114082206im_/https://firebase.google.com/images/products/realtime-database/database-illo_1x.png 1x" src="/web/20210114082206im_/https://firebase.google.com/images/products/realtime-database/database-illo_1x.png" role="presentation" aria-hidden="true"> </div> </header> </section> <div class="content-wrapper"> <section class="card"> <div class="card__content"> <div id="real-time-syncing-for-json-data" class="card__subpartial product-row "> <div class="product-row__media"> <div class="firesite__video"> <iframe class="devsite-embedded-youtube-video" data-video-id="U5aeM5dvUpA" data-list="PLl-K7zZEsYLmOF_07IayrTntevxtbUxDL" data-autohide="1" data-showinfo="0" frameborder="0" allowfullscreen> </iframe> </div> </div> <div class="product-row__text"> <h4 class="no-link" id="real-time-syncing-for-json-data" data-text="Real time syncing for JSON data">Real time syncing for JSON data</h4> <p>The Firebase Realtime Database is a cloud-hosted NoSQL database that lets you store and sync data between your users in realtime.</p> <div class="product-row__footnote"> <div class="product-row__footnote-text"> <p><strong>NEW:</strong> Cloud Firestore enables you to store, sync and query app data at global scale.</p> <a href="https://web.archive.org/web/20210114082206/https://firebase.googleblog.com/2017/10/introducing-cloud-firestore.html" class="cta-link"> Learn more </a> </div> </div> </div> </div> <hr class="card__divider"> <div id="collaborate-across-devices-with-ease" class="card__subpartial product-row "> <div class="product-row__media"> <img src="/web/20210114082206im_/https://firebase.google.com/images/products/realtime-database/database-2.png" alt="Illustration of syncing cloud data with clients"> </div> <div class="product-row__text"> <h4 class="no-link" id="collaborate-across-devices-with-ease" data-text="Collaborate across devices with ease">Collaborate across devices with ease</h4> <p>Realtime syncing makes it easy for your users to access their data from any device: web or mobile, and it helps your users collaborate with one another.</p> </div> </div> <hr class="card__divider"> <div id="build-serverless-apps" class="card__subpartial product-row "> <div class="product-row__media"> <img src="/web/20210114082206im_/https://firebase.google.com/images/products/realtime-database/database-3.png" alt="Illustration of syncing cloud data with clients"> </div> <div class="product-row__text"> <h4 class="no-link" id="build-serverless-apps" data-text="Build serverless apps">Build serverless apps</h4> <p>Realtime Database ships with mobile and web SDKs so you can build apps without the need of servers. You can also execute backend code that responds to events triggered by your database using <a href="/web/20210114082206/https://firebase.google.com/products/functions">Cloud Functions for Firebase</a>.</p> </div> </div> <hr class="card__divider"> <div id="optimized-for-offline-use" class="card__subpartial product-row "> <div class="product-row__media"> <img src="/web/20210114082206im_/https://firebase.google.com/images/products/realtime-database/database-4.png" alt="Phone screen showing offline status"> </div> <div class="product-row__text"> <h4 class="no-link" id="optimized-for-offline-use" data-text="Optimized for offline use">Optimized for offline use</h4> <p>When your users go offline, the Realtime Database SDKs use local cache on the device to serve and store changes. When the device comes online, the local data is automatically synchronized.</p> </div> </div> <hr class="card__divider"> <div id="strong-user-based-security" class="card__subpartial product-row "> <div class="product-row__media"> <img src="/web/20210114082206im_/https://firebase.google.com/images/products/realtime-database/database-5.png" alt="Diagram showing secure connections"> </div> <div class="product-row__text"> <h4 class="no-link" id="strong-user-based-security" data-text="Strong user-based security">Strong user-based security</h4> <p>The Realtime Database integrates with Firebase Authentication to provide simple and intuitive authentication for developers. You can use our declarative security model to allow access based on user identity or with pattern matching on your data.</p> </div> </div> </div> </section> </div> <div class="content-wrapper"> <section class="card"> <div class="card__content"> <div class="card__subpartial cta-banner card__subpartial--no-margin "> <div class="cta-banner__text"> <h2 class="no-link" id="part-of-the-firebase-platform" data-text="Part of the Firebase platform">Part of the Firebase platform</h2> <p>Firebase helps you develop high-quality apps, grow your user base, and earn more money. 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