# Bun Write a Blob to a file

> Write a Blob to a file

- Skill: `jarle/bun-write-a-blob-to-a-file` (Agent Skill)
- Install (CLI): `npx skillmds@latest add jarle/bun-write-a-blob-to-a-file`
- Raw SKILL.md: https://api.skillmd.com/api/skills/jarle/bun-write-a-blob-to-a-file/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: jarle (https://skillmd.com/u/jarle)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/jarle/bun-write-a-blob-to-a-file

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# Write a Blob to a file

This code snippet writes a `Blob` to disk at a particular path.

It uses the fast [`Bun.write()`](/runtime/file-io#writing-files-bun-write) API to efficiently write data to disk. The first argument is a *destination*, like an absolute path or `BunFile` instance. The second argument is the *data* to write.

```ts  theme={"theme":{"light":"github-light","dark":"dracula"}}
const path = "/path/to/file.txt";
await Bun.write(path, "Lorem ipsum");
```

***

The `BunFile` class extends `Blob`, so you can pass a `BunFile` directly into `Bun.write()` as well.

```ts  theme={"theme":{"light":"github-light","dark":"dracula"}}
const path = "./out.txt";
const data = Bun.file("./in.txt");

// write the contents of ./in.txt to ./out.txt
await Bun.write(path, data);
```

***

See [Docs > API > File I/O](/runtime/file-io#writing-files-bun-write) for complete documentation of `Bun.write()`.