# Bun APIs > Overview of Bun's native APIs available on the Bun global object and built-in modules Bun implements a set of native APIs on the `Bun` global object and through several built-in modules. These APIs are heavily optimized and are the canonical "Bun-native" way to implement common functionality. Bun strives to implement standard Web APIs wherever possible. Bun introduces new APIs primarily for server-side tasks where no standard exists, such as file I/O and starting an HTTP server. In these cases, Bun's approach still builds atop standard APIs like `Blob`, `URL`, and `Request`. ```ts server.ts icon="/icons/typescript.svg" Bun.serve({ fetch(req: Request) { return new Response("Success!"); }, }); ``` Use the links in the table to jump to the associated documentation. | Topic | APIs | | -------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | HTTP Server | [`Bun.serve`](https://bun.aphrody.com/docs/runtime/http/server) | | Shell | [`$`](https://bun.aphrody.com/docs/runtime/shell) | | Bundler | [`Bun.build`](https://bun.aphrody.com/docs/bundler) | | File I/O | [`Bun.file`](https://bun.aphrody.com/docs/runtime/file-io#reading-files-bun-file), [`Bun.write`](https://bun.aphrody.com/docs/runtime/file-io#writing-files-bun-write), `Bun.stdin`, `Bun.stdout`, `Bun.stderr` | | Child Processes | [`Bun.spawn`](https://bun.aphrody.com/docs/runtime/child-process#spawn-a-process-bun-spawn), [`Bun.spawnSync`](https://bun.aphrody.com/docs/runtime/child-process#blocking-api-bun-spawnsync) | | TCP Sockets | [`Bun.listen`](https://bun.aphrody.com/docs/runtime/networking/tcp#start-a-server-bun-listen), [`Bun.connect`](https://bun.aphrody.com/docs/runtime/networking/tcp#create-a-connection-bun-connect) | | UDP Sockets | [`Bun.udpSocket`](https://bun.aphrody.com/docs/runtime/networking/udp) | | WebSockets | `new WebSocket()` (client), [`Bun.serve`](https://bun.aphrody.com/docs/runtime/http/websockets) (server) | | Transpiler | [`Bun.Transpiler`](https://bun.aphrody.com/docs/runtime/transpiler) | | Routing | [`Bun.FileSystemRouter`](https://bun.aphrody.com/docs/runtime/file-system-router) | | Streaming HTML | [`HTMLRewriter`](https://bun.aphrody.com/docs/runtime/html-rewriter) | | Headless Browser | [`Bun.WebView`](https://bun.aphrody.com/docs/runtime/webview) | | Hashing | [`Bun.password`](https://bun.aphrody.com/docs/runtime/hashing#bun-password), [`Bun.hash`](https://bun.aphrody.com/docs/runtime/hashing#bun-hash), [`Bun.CryptoHasher`](https://bun.aphrody.com/docs/runtime/hashing#bun-cryptohasher), `Bun.sha` | | CSRF Protection | [`Bun.CSRF.generate`](https://bun.aphrody.com/docs/runtime/csrf), [`Bun.CSRF.verify`](https://bun.aphrody.com/docs/runtime/csrf) | | SQLite | [`bun:sqlite`](https://bun.aphrody.com/docs/runtime/sqlite) | | SQL Client | [`Bun.SQL`](https://bun.aphrody.com/docs/runtime/sql), `Bun.sql` | | Redis (Valkey) Client | [`Bun.RedisClient`](https://bun.aphrody.com/docs/runtime/redis), `Bun.redis` | | FFI (Foreign Function Interface) | [`bun:ffi`](https://bun.aphrody.com/docs/runtime/ffi) | | DNS | [`Bun.dns.lookup`](https://bun.aphrody.com/docs/runtime/networking/dns), `Bun.dns.prefetch`, `Bun.dns.getCacheStats` | | Testing | [`bun:test`](https://bun.aphrody.com/docs/test) | | Workers | [`new Worker()`](https://bun.aphrody.com/docs/runtime/workers) | | Module Loaders | [`Bun.plugin`](https://bun.aphrody.com/docs/bundler/plugins) | | Glob | [`Bun.Glob`](https://bun.aphrody.com/docs/runtime/glob) | | Cookies | [`Bun.Cookie`](https://bun.aphrody.com/docs/runtime/cookies), [`Bun.CookieMap`](https://bun.aphrody.com/docs/runtime/cookies) | | Node-API | [`Node-API`](https://bun.aphrody.com/docs/runtime/node-api) | | `import.meta` | [`import.meta`](https://bun.aphrody.com/docs/runtime/module-resolution#import-meta) | | Utilities | [`Bun.version`](https://bun.aphrody.com/docs/runtime/utils#bun-version), [`Bun.revision`](https://bun.aphrody.com/docs/runtime/utils#bun-revision), [`Bun.env`](https://bun.aphrody.com/docs/runtime/utils#bun-env), [`Bun.main`](https://bun.aphrody.com/docs/runtime/utils#bun-main) | | Sleep & Timing | [`Bun.sleep()`](https://bun.aphrody.com/docs/runtime/utils#bun-sleep), [`Bun.sleepSync()`](https://bun.aphrody.com/docs/runtime/utils#bun-sleepsync), [`Bun.nanoseconds()`](https://bun.aphrody.com/docs/runtime/utils#bun-nanoseconds) | | Random & UUID | [`Bun.randomUUIDv7()`](https://bun.aphrody.com/docs/runtime/utils#bun-randomuuidv7) | | System & Environment | [`Bun.which()`](https://bun.aphrody.com/docs/runtime/utils#bun-which) | | Comparison & Inspection | [`Bun.peek()`](https://bun.aphrody.com/docs/runtime/utils#bun-peek), [`Bun.deepEquals()`](https://bun.aphrody.com/docs/runtime/utils#bun-deepequals), `Bun.deepMatch`, [`Bun.inspect()`](https://bun.aphrody.com/docs/runtime/utils#bun-inspect) | | String & Text Processing | [`Bun.escapeHTML()`](https://bun.aphrody.com/docs/runtime/utils#bun-escapehtml), [`Bun.stringWidth()`](https://bun.aphrody.com/docs/runtime/utils#bun-stringwidth), `Bun.indexOfLine` | | URL & Path Utilities | [`Bun.fileURLToPath()`](https://bun.aphrody.com/docs/runtime/utils#bun-fileurltopath), [`Bun.pathToFileURL()`](https://bun.aphrody.com/docs/runtime/utils#bun-pathtofileurl) | | Compression | [`Bun.gzipSync()`](https://bun.aphrody.com/docs/runtime/utils#bun-gzipsync), [`Bun.gunzipSync()`](https://bun.aphrody.com/docs/runtime/utils#bun-gunzipsync), [`Bun.deflateSync()`](https://bun.aphrody.com/docs/runtime/utils#bun-deflatesync), [`Bun.inflateSync()`](https://bun.aphrody.com/docs/runtime/utils#bun-inflatesync), `Bun.zstdCompressSync()`, `Bun.zstdDecompressSync()`, `Bun.zstdCompress()`, `Bun.zstdDecompress()` | | Stream Processing | [`Bun.readableStreamTo*()`](https://bun.aphrody.com/docs/runtime/utils#bun-readablestreamto), `Bun.readableStreamToBytes()`, `Bun.readableStreamToBlob()`, `Bun.readableStreamToFormData()`, `Bun.readableStreamToJSON()`, `Bun.readableStreamToArray()` | | Memory & Buffer Management | `Bun.ArrayBufferSink`, `Bun.allocUnsafe`, `Bun.concatArrayBuffers` | | Module Resolution | [`Bun.resolveSync()`](https://bun.aphrody.com/docs/runtime/utils#bun-resolvesync) | | Parsing & Formatting | [`Bun.semver`](https://bun.aphrody.com/docs/runtime/semver), [`Bun.TOML.parse`](https://bun.aphrody.com/docs/runtime/toml), [`Bun.XML`](https://bun.aphrody.com/docs/runtime/xml), [`Bun.markdown`](https://bun.aphrody.com/docs/runtime/markdown), [`Bun.color`](https://bun.aphrody.com/docs/runtime/color), [`Bun.Image`](https://bun.aphrody.com/docs/runtime/image) | | Low-level / Internals | `Bun.mmap`, `Bun.gc`, `Bun.generateHeapSnapshot`, [`bun:jsc`](https://bun.com/reference/bun/jsc) |