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Hot reload an HTTP server - Bun

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Hot reload an HTTP server - BunSkip to main contentBun home pageSearch...⌘KInstall BunSearch...NavigationHTTP & NetworkingHot reload an HTTP serverRuntimePackage 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 iteratorsStream 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 & NetworkingHot reload an HTTP serverCopy 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">Bun supports the --hot flag to run a file with hot reloading enabled. When any module or file changes, Bun re-runs the file. terminalCopybun --hot run index.ts Bun detects when you are running an HTTP server with Bun.serve(). It reloads your fetch handler when source files change, without restarting the bun process. This makes hot reloads nearly instantaneous. Note that this doesn’t reload the page on your browser. index.tsCopyBun.serve({ port: 3000, fetch(req) { return new Response("Hello world"); }, });

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