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Convert a ReadableStream to a Buffer with Bun

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Bun provides a number of convenience functions for reading the contents of a ReadableStream into different formats. This snippet reads the contents of a ReadableStream to an ArrayBuffer, then creates a Buffer that points to it.

const stream = new ReadableStream();
const arrBuf = await Bun.readableStreamToArrayBuffer(stream);
const nodeBuf = Buffer.from(arrBuf);

See Docs > API > Utils for documentation on Bun's other ReadableStream conversion functions.

Ecosystem

Use React and JSX

Use EdgeDB with Bun

Use Prisma with Bun

Create a Discord bot

Add Sentry to a Bun app

Use Drizzle ORM with Bun

Run Bun as a daemon with PM2

Build an app with Nuxt and Bun

Build an app with Qwik and Bun

Build an app with Astro and Bun

Build an app with Remix and Bun

Run Bun as a daemon with systemd

Build an app with Next.js and Bun

Deploy a Bun application on Render

Build an app with SvelteKit and Bun

Build a frontend using Vite and Bun

Build an app with SolidStart and Bun

Use Neon Postgres through Drizzle ORM

Build an HTTP server using Hono and Bun

Use Neon's Serverless Postgres with Bun

Build an HTTP server using Elysia and Bun

Containerize a Bun application with Docker

Build an HTTP server using Express and Bun

Server-side render (SSR) a React component

Build an HTTP server using StricJS and Bun

Read and write data to MongoDB using Mongoose and Bun

HTTP

Common HTTP server usage

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Stream a file as an HTTP Response

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fetch with unix domain sockets in Bun

Streaming HTTP Server with Async Iterators

Streaming HTTP Server with Node.js Streams

Package manager

Add a dependency

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Using bun install with Artifactory

Generate a human-readable lockfile

Migrate from npm install to bun install

Configuring a monorepo using workspaces

Install a package under a different name

Configure git to diff Bun's lockb lockfile

Install dependencies with Bun in GitHub Actions

Override the default npm registry for bun install

Using bun install with an Azure Artifacts npm registry

Configure a private registry for an organization scope with bun install

Processes

Read from stdin

Listen for CTRL+C

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Parse command-line arguments

Read stderr from a child process

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Spawn a child process and communicate using IPC

Reading files

Read a JSON file

Check if a file exists

Read a file to a Buffer

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Get the MIME type of a file

Read a file to a Uint8Array

Read a file to an ArrayBuffer

Watch a directory for changes

Read a file as a ReadableStream

Runtime

Import a JSON file

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Set a time zone in Bun

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Import a HTML file as text

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Debugging Bun with the web debugger

Install and run Bun in GitHub Actions

Install TypeScript declarations for Bun

Debugging Bun with the VS Code extension

Define and replace static globals & constants

Streams

Convert a ReadableStream to JSON

Convert a Node.js Readable to JSON

Convert a ReadableStream to a Blob

Convert a Node.js Readable to a Blob

Convert a ReadableStream to a Buffer

Convert a ReadableStream to a string

Convert a Node.js Readable to a string

Convert a ReadableStream to a Uint8Array

Convert a ReadableStream to an ArrayBuffer

Convert a Node.js Readable to an Uint8Array

Convert a Node.js Readable to an ArrayBuffer

Convert a ReadableStream to an array of chunks

Test runner

Mock functions in bun test

Spy on methods in bun test

Using Testing Library with Bun

Update snapshots in bun test

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Set the system time in Bun's test runner

Write browser DOM tests with Bun and happy-dom

Set a per-test timeout with the Bun test runner

Mark a test as a "todo" with the Bun test runner

Re-run tests multiple times with the Bun test runner

Set a code coverage threshold with the Bun test runner

Generate code coverage reports with the Bun test runner

import, require, and test Svelte components with bun test

Utilities

Hash a password

Escape an HTML string

Get the current Bun version

Encode and decode base64 strings

Check if two objects are deeply equal

Detect when code is executed with Bun

Get the directory of the current file

Get the file name of the current file

Convert a file URL to an absolute path

Compress and decompress data with gzip

Convert an absolute path to a file URL

Get the path to an executable bin file

Sleep for a fixed number of milliseconds

Compress and decompress data with DEFLATE

Get the absolute path of the current file

Check if the current file is the entrypoint

Get the absolute path to the current entrypoint

WebSocket

Build a simple WebSocket server

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Writing files

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Copy a file to another location

Write a ReadableStream to a file