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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/20210425201709/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/20210425201709/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/20210425201709/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 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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/20210425201709/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> <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="Docs"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Docs"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a 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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/20210425201709/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/20210425201709/https://firebase.google.com/products-release" class="devsite-nav-title 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Overview" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="overview"> <span class="devsite-nav-text" tooltip> Overview </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210425201709/https://firebase.google.com/docs/guides" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Fundamentals" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="fundamentals"> <span class="devsite-nav-text" tooltip> Fundamentals </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210425201709/https://firebase.google.com/docs/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/20210425201709/https://firebase.google.com/docs/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/20210425201709/https://firebase.google.com/docs/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" track-metadata-position="nav" track-name="engage"> <span class="devsite-nav-text" tooltip> Engage </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210425201709/https://firebase.google.com/docs/reference" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Reference" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="reference"> <span class="devsite-nav-text" tooltip> Reference </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210425201709/https://firebase.google.com/docs/samples" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Samples" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" track-name="samples"> <span class="devsite-nav-text" tooltip> Samples </span> </a> </li> <li class="devsite-nav-item"> <a href="/web/20210425201709/https://firebase.google.com/docs/libraries" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Libraries" track-type="navMenu" track-metadata-eventdetail="globalMenu" track-metadata-position="nav" 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Register to get the most out of the digital experience: Build your schedule, reserve space, participate in Q&As;, earn Google Developer profile badges, and more. <a href="https://web.archive.org/web/20210425201709/https://events.google.com/io/?utm_source=firebase&utm_medium=embedded_marketing&utm_campaign=svd-2021-fb" target="_blank" rel="noopener noreferrer">Register now</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/20210425201709/https://firebase.google.com/" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Firebase"> Firebase </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" 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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/20210425201709im_/https://firebase.google.com/images/backgrounds/nachos/products/product_mid.svg" alt="" role="presentation"/> </div> <div class="firesite__bg--top"> <svg width="5494" height="5614" viewbox="0 0 5494 5614" fill="none" xmlns="http://www.w3.org/2000/svg"><path opacity=".5" d="M5134.73 3946.02c-44.22 489.57-1391.4 1154.88-2007.46 1023.73-616.06-131.15-1802.35-1281.82-1715.71-1816.35 86.63-534.52 1590.06-956.61 2142.86-819.11 552.81 137.51 1624.54 1122.17 1580.31 1611.73z" fill="#607D8B" fill-opacity=".12"/><path d="M3897.07 3349.92c-353.17 337.39-2360.09 1092.15-2893.89 582.57-533.797-509.58-146.735-2480.36 447.6-2917.86 594.33-437.508 2647.88 33.35 2918.99 439.62 271.11 406.26-119.52 1558.28-472.7 1895.67z" fill="#37474F"/><path opacity=".8" 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cta-button--white gc-analytics-event"> Visit console </a> <a href="/web/20210425201709/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/20210425201709im_/https://firebase.google.com/images/products/realtime-database/database-illo_2x.png 2x, https://web.archive.org/web/20210425201709im_/https://firebase.google.com/images/products/realtime-database/database-illo_1x.png 1x" src="/web/20210425201709im_/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/20210425201709/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/20210425201709im_/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/20210425201709im_/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/20210425201709/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/20210425201709im_/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/20210425201709im_/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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