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Server-Sent Events (SSE) with Bun - Bun

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Server-Sent Events (SSE) with Bun - BunSkip to main contentBun home pageSearch...⌘KInstall BunSearch...NavigationHTTP & NetworkingServer-Sent Events (SSE) with BunRuntimePackage ManagerBundlerTest RunnerGuidesReferenceBlogFeedbackdiv:first-child]:!hidden peer-[.is-custom]:[&>div:first-child]:sm:!hidden peer-[.is-custom]:[&>div:first-child]:md:!hidden peer-[.is-custom]:[&>div:first-child]:lg:!hidden peer-[.is-custom]:[&>div:first-child]:xl:!hidden">OverviewGuidesDeploymentDeploy on VercelDeploy on RailwayDeploy on RenderDeploy on AWS LambdaDeploy on DigitalOceanDeploy on Google Cloud RunRuntime & DebuggingTypeScript typesRe-map import pathsVS Code debuggerWeb debuggerHeap snapshotsBuild-time constantsDefine constantsGitHub ActionsCodesign on macOSUtilitiesUpgrade BunDetect BunGet Bun versionHash passwordGenerate UUIDBase64 encodingGzip compressionDEFLATE compressionEscape HTMLDeep equalitySleepFile URL to pathPath to file URLFind executable pathimport.meta.dirimport.meta.fileimport.meta.pathCheck entrypointGet entrypoint pathEcosystem & FrameworksAstro with BunDiscord.js with BunDocker with BunDrizzle with BunGel with BunElysia with BunExpress with BunHono with BunMongoose with BunNeon Drizzle with BunNeon Serverless Postgres with BunNext.js with BunNuxt with BunPM2 with BunPrisma ORM with BunPrisma Postgres with BunQwik with BunReact with BunRemix with BunTanStack Start with BunSentry with BunSolidStart with BunSSR React with BunStricJS with BunSvelteKit with Bunsystemd with BunVite with BunUpstash with BunHTTP & NetworkingHTTP Server with BunSimple HTTP Server with BunFetch with BunHot reload an HTTP serverStart a cluster of HTTP serversConfigure TLSProxy HTTP requests using fetch()Stream file responseUpload files via HTTP using FormDataFetch with unix domain socketsStream with iteratorsServer-Sent EventsStream with Node.jsWebSocketSimple serverPub-sub serverContextual dataEnable compressionProcesses & SystemSpawn child processRead stdoutRead stderrParse command-line argumentsRead from stdinSpawn a child process and communicate using IPCListen for CTRL+COS signalsProcess uptimeRun shell commandSet time zoneSet env variablesRead env variablesPackage ManagerAdd a dependencyAdd a dev dependencyAdd an optional dependencyAdd a peer dependencyAdd a Git dependencyAdd a tarball dependencyInstall with aliasWorkspaces with BunOverride the default npm registryConfigure a scoped registryAzure Artifacts with BunJFrog Artifactory with BunAdd a trusted dependencyGenerate a yarn-compatible lockfileMigrate from npm to bunConfigure git to diff Bun's lockfileInstall Bun in GitHub ActionsTest RunnerRun testsWatch modeMigrate from JestMock functionsSpy on methodsMock system timeSnapshot testingUpdate snapshotsCoverage reportsCoverage thresholdConcurrent test globSkip testsTodo testsTest timeoutBail earlyRe-run testsTesting LibraryDOM testsTest SvelteRuntime & DebuggingVS Code debuggerWeb debuggerHeap snapshotsBuild-time constantsDefine constantsGitHub ActionsCodesign on macOSModule SystemImport JSONImport TOMLImport YAMLImport JSON5Import HTMLimport.meta.dirimport.meta.fileimport.meta.pathCheck entrypointGet entrypoint pathFile SystemRead as stringRead to BufferRead to Uint8ArrayRead to ArrayBufferRead JSON fileGet MIME typeCheck file existsWatch directoryRead as streamWrite string to fileWrite BlobWrite ResponseAppend to fileIncremental writeWrite streamWrite to stdoutWrite file to stdoutCopy fileDelete fileDelete filesDelete directoriesUtilitiesHash passwordGenerate UUIDBase64 encodingGzip compressionDEFLATE compressionEscape HTMLDeep equalitySleepFile URL to pathPath to file URLFind executable pathHTML ProcessingExtract links using HTMLRewriterOpenGraph tagsBinary DataArrayBuffer to stringArrayBuffer to BufferArrayBuffer to BlobArrayBuffer to ArrayArrayBuffer to Uint8ArrayBuffer to stringBuffer to ArrayBufferBuffer to BlobBuffer to Uint8ArrayBuffer to ReadableStreamBlob to stringBlob to ArrayBufferBlob to Uint8ArrayBlob to DataViewBlob to ReadableStreamUint8Array to stringUint8Array to ArrayBufferUint8Array to BufferUint8Array to BlobUint8Array to DataViewUint8Array to ReadableStreamDataView to stringStreamsStream to stringStream to JSONStream to BlobStream to BufferStream to ArrayBufferStream to Uint8ArrayStream to arrayReadable to stringReadable to JSONReadable to BlobReadable to Uint8ArrayReadable to ArrayBufferHTTP & NetworkingServer-Sent Events (SSE) with BunCopy 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_2shjinpfd9rqaabsnpfdb_" aria-haspopup="menu" aria-expanded="false" data-state="closed">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_5hjinpfd9rqaabsnpfdb_" aria-haspopup="menu" aria-expanded="false" data-state="closed">Server-Sent Events let you push a stream of text events to the browser over a single HTTP response. The client consumes them via EventSource. In Bun, you can implement an SSE endpoint by returning a Response whose body is a streaming source and setting the Content-Type header to text/event-stream. Bun.serve closes idle connections after 10 seconds by default. A quiet SSE stream counts as idle, so the examples below call server.timeout(req, 0) to disable the timeout for the stream. See idleTimeout for details. ​Using an async generator In Bun, new Response accepts an async generator function directly. This is usually the simplest way to write an SSE endpoint — each yield flushes a chunk to the client, and if the client disconnects, the generator’s finally block runs so you can clean up. server.tsCopyBun.serve({ port: 3000, routes: { "/events": (req, server) => { // SSE streams are often quiet between events. By default, // Bun.serve closes connections after 10 seconds of inactivity. // Disable the idle timeout for this request so the stream // stays open indefinitely. server.timeout(req, 0); return new Response( async function* () { yield `data: connected at ${Date.now()}\n\n`; // Emit a tick every 5 seconds until the client disconnects. // When the client goes away, the generator is returned // (cancelled) and this loop stops automatically. while (true) { await Bun.sleep(5000); yield `data: tick ${Date.now()}\n\n`; } }, { headers: { "Content-Type": "text/event-stream", "Cache-Control": "no-cache", }, }, ); }, }, }); ​Using a ReadableStream If your events originate from callbacks — message brokers, timers, external pushes — rather than a linear await flow, a ReadableStream often fits better. When the client disconnects, Bun calls the stream’s cancel() method automatically, so you can release any resources you set up in start(). server.tsCopyBun.serve({ port: 3000, routes: { "/events": (req, server) => { server.timeout(req, 0); let timer: Timer; const stream = new ReadableStream({ start(controller) { controller.enqueue(`data: connected at ${Date.now()}\n\n`); timer = setInterval(() => { controller.enqueue(`data: tick ${Date.now()}\n\n`); }, 5000); }, cancel() { // Called automatically when the client disconnects. clearInterval(timer); }, }); return new Response(stream, { headers: { "Content-Type": "text/event-stream", "Cache-Control": "no-cache", }, }); }, }, });

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