Web APIs - Bun

Web APIs - BunDocumentation Index

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Skip to main contentBun home pageSearch...⌘KInstall BunSearch...NavigationStandards & CompatibilityWeb APIsRuntimePackage ManagerBundlerTest RunnerGuidesReferenceBlogFeedback:first-child]:!hidden peer-[.is-custom]:[&>:first-child]:sm:!hidden peer-[.is-custom]:[&>:first-child]:md:!hidden peer-[.is-custom]:[&>:first-child]:lg:!hidden peer-[.is-custom]:[&>:first-child]:xl:!hidden">Get StartedWelcome to BunInstallationQuickstartTypeScriptTypeScript 6 and 7bun initbun createCore RuntimeBun RuntimeWatch ModeDebuggingREPLbunfig.tomlFile & Module SystemFile TypesModule ResolutionJSXAuto-installPluginsFile System RouterHTTP serverServerRoutingCookiesTLSError HandlingMetricsNetworkingFetchWebSocketsTCPUDPDNSData & StorageCookiesFile I/OStreamsBinary DataArchiveSQLSQLiteS3RedisConcurrencyWorkersProcess & SystemEnvironment VariablesShellSpawnWebViewCronInterop & ToolingNode-APIFFIC CompilerTranspilerUtilitiesCSRF ProtectionSecretsConsoleTOMLYAMLMarkdownJSON5JSONLHTMLRewriterImageHashingGlobSemverColorUtilsStandards & CompatibilityGlobalsBun APIsWeb APIsNode.js CompatibilityContributingRoadmapBenchmarkingContributingBuilding WindowsBindgenLicenseStandards & CompatibilityWeb APIsCopy pagespan]:line-clamp-1 overflow-hidden group flex items-center py-0.5 gap-1 text-sm text-gray-950/50 dark:text-white/50 group-hover:text-gray-950/70 dark:group-hover:text-white/70 rounded-none rounded-r-xl border px-3 border-gray-200 aspect-square dark:border-white/[0.07] bg-background-light dark:bg-background-dark hover:bg-gray-600/5 dark:hover:bg-gray-200/5" aria-label="More actions" type="button" id="radix-_R_n4ctdbsnlht5lebsnpfdb_" aria-haspopup="menu" aria-expanded="false" data-state="closed">*]:[overflow-wrap:anywhere]">

Web-standard APIs supported by Bun for server-side JavaScript

Copy pagespan]:line-clamp-1 overflow-hidden group flex items-center py-0.5 gap-1 text-sm text-gray-950/50 dark:text-white/50 group-hover:text-gray-950/70 dark:group-hover:text-white/70 rounded-none rounded-r-xl border px-3 border-gray-200 aspect-square dark:border-white/[0.07] bg-background-light dark:bg-background-dark hover:bg-gray-600/5 dark:hover:bg-gray-200/5" aria-label="More actions" type="button" id="radix-_R_1cctdbsnlht5lebsnpfdb_" aria-haspopup="menu" aria-expanded="false" data-state="closed">Some Web APIs aren’t relevant in the context of a server-first runtime like Bun, such as the DOM API or History API. Many others, though, are broadly useful outside of the browser context; when possible, Bun implements these Web-standard APIs instead of introducing new APIs. The following Web APIs are partially or completely supported. CategoryAPIsHTTPfetch, Response, Request, Headers, AbortController, AbortSignalURLsURL, URLSearchParamsWeb WorkersWorker, self.postMessage, structuredClone, MessagePort, MessageChannel, BroadcastChannelStreamsReadableStream, WritableStream, TransformStream, ByteLengthQueuingStrategy, CountQueuingStrategy and associated classesBlobBlobWebSocketsWebSocketEncoding and decodingatob, btoa, TextEncoder, TextDecoderJSONJSONTimeoutssetTimeout, clearTimeoutIntervalssetInterval, clearIntervalCryptocrypto, SubtleCrypto, CryptoKeyDebuggingconsole, performanceMicrotasksqueueMicrotaskErrorsreportErrorUser interactionalert, confirm, prompt (intended for interactive CLIs)RealmsShadowRealmEventsEventTarget, Event, ErrorEvent, CloseEvent, MessageEvent

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