@arcjet/bun/README.md

Arcjet SDK for Bun

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# `@arcjet/bun`

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[Arcjet][arcjet] helps developers protect their apps in just a few lines of
code. Implement rate limiting, bot protection, email verification, and defense
against common attacks.

This is the [Arcjet][arcjet] SDK for [Bun.sh][bun-sh].

- [npm package (`@arcjet/bun`)](https://www.npmjs.com/package/@arcjet/bun)
- [GitHub source code (`arcjet-bun/` in `arcjet/arcjet-js`)](https://github.com/arcjet/arcjet-js/tree/main/arcjet-bun)

## Getting started

Visit the [quick start guide][quick-start] to get started.

## Example app

Try an Arcjet protected app live at [https://example.arcjet.com][example-url]
([source code][example-source]).

## What is this?

This is our adapter to integrate Arcjet into Bun.
Arcjet helps you secure your Bun server.
This package exists so that we can provide the best possible experience to
Bun users.

## When should I use this?

You can use this if you are using Bun.
See our [_Get started_ guide][arcjet-get-started] for other supported
runtimes.

## Install

This package is ESM only.
Install with Bun:

```sh
bun add @arcjet/bun
```

## Use

```ts
import arcjet, { shield } from "@arcjet/bun";

// Get your Arcjet key at <https://app.arcjet.com>.
// Set it as an environment variable instead of hard coding it.
const arcjetKey = Bun.env.ARCJET_KEY;

if (!arcjetKey) {
  throw new Error("Cannot find `ARCJET_KEY` environment variable");
}

const aj = arcjet({
  key: arcjetKey,
  rules: [
    // Shield protects your app from common attacks.
    // Use `DRY_RUN` instead of `LIVE` to only log.
    shield({ mode: "LIVE" }),
  ],
});

export default {
  port: 8000,
  fetch: aj.handler(async function (request: Request) {
    const decision = await aj.protect(request);

    if (decision.isDenied()) {
      return Response.json({ message: "Forbidden" }, { status: 403 });
    }

    return Response.json({ message: "Hello world" });
  }),
};
```

For more on how to configure Arcjet with Bun and how to protect Bun,
see the [Arcjet Bun SDK reference][arcjet-reference-bun] on our website.

## License

[Apache License, Version 2.0][apache-license] © [Arcjet Labs, Inc.][arcjet]

[arcjet-get-started]: https://docs.arcjet.com/get-started
[arcjet-reference-bun]: https://docs.arcjet.com/reference/bun
[arcjet]: https://arcjet.com
[bun-sh]: https://bun.sh/
[example-url]: https://example.arcjet.com
[quick-start]: https://docs.arcjet.com/get-started/bun
[example-source]: https://github.com/arcjet/arcjet-js-example
[apache-license]: http://www.apache.org/licenses/LICENSE-2.0