bun.sh/docs/runtime/bun-apis.md

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.

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

---

• Bundler
• Bun.build

---

• File I/O
• Bun.file Bun.write

---

• Child processes
• Bun.spawn Bun.spawnSync

---

• TCP
• Bun.listen Bun.connect

---

• Transpiler
• Bun.Transpiler

---

• Routing
• Bun.FileSystemRouter

---

• HTML Rewriting
• HTMLRewriter

---

• Hashing
• Bun.hash Bun.CryptoHasher

---

• import.meta
• import.meta

---

• SQLite
• bun:sqlite

---

• FFI
• bun:ffi

---

• Testing
• bun:test

---

• Node-API
• Node-API

---

• Utilities
• Bun.version Bun.revision Bun.env Bun.main Bun.sleep() Bun.sleepSync() Bun.which() Bun.peek() Bun.openInEditor() Bun.deepEquals() Bun.escapeHTML() Bun.fileURLToPath() Bun.pathToFileURL() Bun.gzipSync() Bun.gunzipSync() Bun.deflateSync() Bun.inflateSync() Bun.inspect() Bun.nanoseconds() Bun.readableStreamTo*() Bun.resolveSync()

{% /table %}