@arcjet/fastify

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 SDK for Fastify.

Getting started

Visit the quick start guide to get started.

What is this?

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

When should I use this?

You can use this if you are using Fastify. See our Get started guide for other supported frameworks.

Install

This package is ESM only. Install with npm in Node.js:

npm install @arcjet/fastify

Use

import arcjetFastify, { shield } from "@arcjet/fastify";
import Fastify from "fastify";

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

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

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

const fastify = Fastify({ logger: true });

fastify.get("/", async function (request, reply) {
  const decision = await arcjet.protect(request);

  if (decision.isDenied()) {
    return reply
      .status(403)
      .header("Content-Type", "application/json")
      .send({ message: "Forbidden" });
  }

  return reply
    .status(200)
    .header("Content-Type", "application/json")
    .send({ message: "Hello world" });
});

await fastify.listen({ port: 8000 });

License

Apache License, Version 2.0 © Arcjet Labs, Inc.