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Bun implements a set of native APIs on the `Bun` global object and through a number of built-in modules. These APIs are heavily optimized and represent the canonical "Bun-native" way to implement some 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
Bun.serve({
fetch(req: Request) {
return new Response("Success!");
},
});
```
Click the link in the right column to jump to the associated documentation.
{% table %}
- Topic
- APIs
---
- HTTP server
- [`Bun.serve`](/docs/api/http#bun-serve)
---
- Bundler
- [`Bun.build`](/docs/bundler)
---
- File I/O
- [`Bun.file`](/docs/api/file-io#reading-files-bun-file) [`Bun.write`](/docs/api/file-io#writing-files-bun-write)
---
- Child processes
- [`Bun.spawn`](/docs/api/spawn#spawn-a-process-bun-spawn) [`Bun.spawnSync`](/docs/api/spawn#blocking-api-bun-spawnsync)
---
- TCP
- [`Bun.listen`](/docs/api/tcp#start-a-server-bun-listen) [`Bun.connect`](/docs/api/tcp#start-a-server-bun-listen)
---
- Transpiler
- [`Bun.Transpiler`](/docs/api/transpiler)
---
- Routing
- [`Bun.FileSystemRouter`](/docs/api/file-system-router)
---
- HTML Rewriting
- [`HTMLRewriter`](/docs/api/html-rewriter)
---
- Hashing
- [`Bun.hash`](/docs/api/hashing#bun-hash) [`Bun.CryptoHasher`](/docs/api/hashing#bun-cryptohasher)
---
- import.meta
- [`import.meta`](/docs/api/import-meta)
---
<!-- - [DNS](/docs/api/dns)
- `Bun.dns`
--- -->
- SQLite
- [`bun:sqlite`](/docs/api/sqlite)
---
- FFI
- [`bun:ffi`](/docs/api/ffi)
---
- Testing
- [`bun:test`](/docs/cli/test)
---
- Node-API
- [`Node-API`](/docs/api/node-api)
---
- Utilities
- [`Bun.version`](/docs/api/utils#bun-version) [`Bun.revision`](/docs/api/utils#bun-revision) [`Bun.env`](/docs/api/utils#bun-env) [`Bun.main`](/docs/api/utils#bun-main) [`Bun.sleep()`](/docs/api/utils#bun-sleep) [`Bun.sleepSync()`](/docs/api/utils#bun-sleepsync) [`Bun.which()`](/docs/api/utils#bun-which) [`Bun.peek()`](/docs/api/utils#bun-peek) [`Bun.openInEditor()`](/docs/api/utils#bun-openineditor) [`Bun.deepEquals()`](/docs/api/utils#bun-deepequals) [`Bun.escapeHTML()`](/docs/api/utils#bun-escapehtml) [`Bun.fileURLToPath()`](/docs/api/utils#bun-fileurltopath) [`Bun.pathToFileURL()`](/docs/api/utils#bun-pathtofileurl) [`Bun.gzipSync()`](/docs/api/utils#bun-gzipsync) [`Bun.gunzipSync()`](/docs/api/utils#bun-gunzipsync) [`Bun.deflateSync()`](/docs/api/utils#bun-deflatesync) [`Bun.inflateSync()`](/docs/api/utils#bun-inflatesync) [`Bun.inspect()`](/docs/api/utils#bun-inspect) [`Bun.nanoseconds()`](/docs/api/utils#bun-nanoseconds) [`Bun.readableStreamTo*()`](/docs/api/utils#bun-readablestreamto) [`Bun.resolveSync()`](/docs/api/utils#bun-resolvesync)
{% /table %}
|
