Workbox | Chrome for Developers

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class="devsite-collapsible-section "> <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://developer.chrome.com/docs/workbox" 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="Workbox" > Workbox </a> </li> </ul> <div class="devsite-product-description"> Build progressive web apps (PWAs) with Workbox - the Service Worker library from the Chrome team </div> </div> </div> <div class="devsite-doc-set-nav-row"> <devsite-tabs class="lower-tabs"> <nav class="devsite-tabs-wrapper" aria-label="Lower tabs"> <tab class="devsite-active"> <a href="https://developer.chrome.com/docs/workbox" 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aria-hidden="true"></div> <a href="https://developer.chrome.com/docs/workbox" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="3" track-type="globalNav" track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="Workbox" > Workbox </a> </li> </ul> </div> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded disabled> </devsite-toc> <div class="devsite-article-body clearfix "> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-67 devsite-landing-row-hero devsite-landing-row-no-image-background" background="deep-orange" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item" description-position="bottom" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <picture> <img alt="" src="https://developer.chrome.com/static/docs/workbox/workbox.png" srcset="https://developer.chrome.com/static/docs/workbox/workbox_36.png 36w,https://developer.chrome.com/static/docs/workbox/workbox_48.png 48w,https://developer.chrome.com/static/docs/workbox/workbox_72.png 72w,https://developer.chrome.com/static/docs/workbox/workbox_96.png 96w,https://developer.chrome.com/static/docs/workbox/workbox_480.png 480w,https://developer.chrome.com/static/docs/workbox/workbox_720.png 720w,https://developer.chrome.com/static/docs/workbox/workbox_856.png 856w,https://developer.chrome.com/static/docs/workbox/workbox_960.png 960w,https://developer.chrome.com/static/docs/workbox/workbox_1440.png 1440w,https://developer.chrome.com/static/docs/workbox/workbox_1920.png 1920w,https://developer.chrome.com/static/docs/workbox/workbox_2880.png 2880w" sizes="(max-width: 600px) 100vw, (max-width: 840px) 50vw, 464px" fetchpriority="high"> </picture> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="workbox" data-text="Workbox" class="hide-from-toc no-link" tabindex="0"> Workbox </h3> <div class="devsite-landing-row-item-description-content"> Production-ready service worker libraries and tooling. </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-4-up devsite-landing-row-cards devsite-landing-row-padding-xlarge" background="white" header-position="top" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="intro-to-service-workers" data-text="Intro to service workers" tabindex="0"> Intro to service workers </h2> <div class="devsite-landing-row-description"> Learn how service workers can progressively enhance your website and how Workbox helps. </div> </div> </header> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <a href="https://developer.chrome.com/docs/workbox/service-worker-overview"> <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="service-worker-overview" data-text="Service worker overview" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/service-worker-overview"> Service worker overview </a> </h3> <div class="devsite-landing-row-item-description-content"> Service workers are specialized JavaScript assets that act as proxies between web browsers and web servers. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <a href="https://developer.chrome.com/docs/workbox/service-worker-lifecycle"> <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="lifecycle" data-text="Lifecycle" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/service-worker-lifecycle"> Lifecycle </a> </h3> <div class="devsite-landing-row-item-description-content"> Understanding the way that service workers behave to make offline applications possible. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <a href="https://developer.chrome.com/docs/workbox/caching-strategies-overview"> <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="caching-strategies" data-text="Caching strategies" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/caching-strategies-overview"> Caching strategies </a> </h3> <div class="devsite-landing-row-item-description-content"> Strategies for interaction between a service worker's fetch event and the Cache interface. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <a href="https://developer.chrome.com/docs/workbox/what-is-workbox"> <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="workbox-overview" data-text="Workbox overview" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/what-is-workbox"> Workbox overview </a> </h3> <div class="devsite-landing-row-item-description-content"> A set of modules that simplify common service worker routing and caching. </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-3-up devsite-landing-row-padding-xlarge" header-position="left" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="what-you-need-to-know" data-text="What you need to know" tabindex="0"> What you need to know </h2> <div class="devsite-landing-row-description"> Guidance to consider when building a service worker. </div> </div> </header> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="expectations-around-service-worker-deployment" data-text="Expectations around service worker deployment" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/service-worker-deployment"> Expectations around service worker deployment </a> </h3> <div class="devsite-landing-row-item-description-content"> Understand the effect a service worker has on a website once deployed. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="remove-buggy-service-workers" data-text="Remove buggy service workers" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/remove-buggy-service-workers"> Remove buggy service workers </a> </h3> <div class="devsite-landing-row-item-description-content"> How to fix a service worker that is causing problems. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="improve-the-service-worker-development-experience" data-text="Improve the service worker development experience" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/improving-development-experience"> Improve the service worker development experience </a> </h3> <div class="devsite-landing-row-item-description-content"> Solve some of the local development issues you may encounter when using service workers. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="troubleshoot-and-logging" data-text="Troubleshoot and logging" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/troubleshooting-and-logging"> Troubleshoot and logging </a> </h3> <div class="devsite-landing-row-item-description-content"> A look at Workbox's logging features, and in-browser service worker debugging tools. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="strategies-for-different-architectures" data-text="Strategies for different architectures" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/different-architectures"> Strategies for different architectures </a> </h3> <div class="devsite-landing-row-item-description-content"> Introduction to the two different website architectures. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="application-shell-model" data-text="Application shell model" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/app-shell-model"> Application shell model </a> </h3> <div class="devsite-landing-row-item-description-content"> How to pair the application shell model with a service worker in your SPA. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="navigation-preload-for-network-first-html" data-text="Navigation Preload for Network-first HTML" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/navigation-preload"> Navigation Preload for Network-first HTML </a> </h3> <div class="devsite-landing-row-item-description-content"> What Navigation Preload is, how it speeds up navigation, and how to use it in Workbox. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="faster-multipage-applications-with-streams" data-text="Faster multipage applications with streams" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/faster-multipage-applications-with-streams"> Faster multipage applications with streams </a> </h3> <div class="devsite-landing-row-item-description-content"> Use workbox-streams to create multi-page applications to create fast experiences that render almost instantaneously. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="pre-caching-dos-and-donts" data-text="Pre-caching dos and don'ts" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/precaching-dos-and-donts"> Pre-caching dos and don'ts </a> </h3> <div class="devsite-landing-row-item-description-content"> Learn the do's and don'ts of pre-caching. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="storage-quota" data-text="Storage quota" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/workbox/understanding-storage-quota"> Storage quota </a> </h3> <div class="devsite-landing-row-item-description-content"> A guide on configuring Workbox to avoid storage quota issues. </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-3-up devsite-landing-row-cards devsite-landing-row-padding-xlarge" background="grey" header-position="top" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="use-cases-and-recipes" data-text="Use cases and recipes" tabindex="0"> Use cases and recipes </h2> <div class="devsite-landing-row-description"> Learn how to handle different use cases to get the most out of Workbox. </div> </div> </header> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="use-workbox-window" data-text="Use workbox-window" class="hide-from-toc no-link" tabindex="0"> Use workbox-window </h3> <div class="devsite-landing-row-item-description-content"> Sometimes users go offline. Learn how to adapt, and help them resume requests when they eventually go back online. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/using-workbox-window" class="button " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="caching-resources-during-runtime" data-text="Caching resources during runtime" class="hide-from-toc no-link" tabindex="0"> Caching resources during runtime </h3> <div class="devsite-landing-row-item-description-content"> Learn how to handle caching resources during runtime, including cross-origin resources. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/caching-resources-during-runtime" class="button " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="force-network-timeout" data-text="Force network timeout" class="hide-from-toc no-link" tabindex="0"> Force network timeout </h3> <div class="devsite-landing-row-item-description-content"> Learn how to force a network timeout in the presence of a slow network connection, with the right timing. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/forcing-a-network-timeout" class="button " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="access-caches-from-the-window" data-text="Access caches from the window" class="hide-from-toc no-link" tabindex="0"> Access caches from the window </h3> <div class="devsite-landing-row-item-description-content"> Accessing cache instances isn't just restricted to the service worker scope. Learn how to access them from the window context. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/access-caches-from-the-window" class="button " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="serve-cached-audio-and-video" data-text="Serve cached audio and video" class="hide-from-toc no-link" tabindex="0"> Serve cached audio and video </h3> <div class="devsite-landing-row-item-description-content"> Learn how to use workbox-range-request to deal with audio and video resource requests in a predictable way. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/serving-cached-audio-and-video" class="button " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="manage-fallback-responses" data-text="Manage fallback responses" class="hide-from-toc no-link" tabindex="0"> Manage fallback responses </h3> <div class="devsite-landing-row-item-description-content"> Sometimes users encounter network failures or go offline. Learn how to adapt to those situations and provide a fallback response. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/managing-fallback-responses" class="button " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="handle-updates-immediately" data-text="Handle updates immediately" class="hide-from-toc no-link" tabindex="0"> Handle updates immediately </h3> <div class="devsite-landing-row-item-description-content"> How to update users when you update a service worker. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/handling-service-worker-updates" class="button " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="retrying-requests-when-back-online" data-text="Retrying requests when back online" class="hide-from-toc no-link" tabindex="0"> Retrying requests when back online </h3> <div class="devsite-landing-row-item-description-content"> Sometimes users go offline. Learn how to adapt, and help them resume requests when they come back online. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/retrying-requests-when-back-online" class="button " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="workbox-plugins" data-text="Workbox plugins" class="hide-from-toc no-link" tabindex="0"> Workbox plugins </h3> <div class="devsite-landing-row-item-description-content"> While Workbox offers lots of off-the-shelf utility, you may need to extend it to satisfy application requirements. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/using-plugins" class="button " >Read the doc</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-2-up devsite-landing-row-cards devsite-landing-row-padding-xlarge" background="white" header-position="top" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="additional-resources" data-text="Additional resources" tabindex="0"> Additional resources </h2> <div class="devsite-landing-row-description"> Dive deeper into Workbox modules, source code, and more. </div> </div> </header> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="workbox-modules" data-text="Workbox modules" class="hide-from-toc no-link" tabindex="0"> Workbox modules </h3> <div class="devsite-landing-row-item-description-content"> Service workers are specialized JavaScript assets that act as proxies between web browsers and web servers. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.chrome.com/docs/workbox/modules" class="button " >Read the docs</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> web </div> </div> <div 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