@arcjet/remix

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 Remix.

Example app

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

Installation

npm install @arcjet/remix

Rate limit + bot detection example

The Arcjet rate limit example below applies a token bucket rate limit rule to a route where we identify the user based on their ID e.g. if they are logged in. The bucket is configured with a maximum capacity of 10 tokens and refills by 5 tokens every 10 seconds. Each request consumes 5 tokens.

import { useLoaderData } from "@remix-run/react";
import { json, LoaderFunctionArgs } from "@remix-run/node";

import arcjet, { tokenBucket, detectBot } from "@arcjet/remix";

const aj = arcjet({
  key: process.env.ARCJET_KEY!, // Get your site key from https://app.arcjet.com
  characteristics: ["userId"], // track requests by a custom user ID
  rules: [
    // Create a token bucket rate limit. Other algorithms are supported.
    tokenBucket({
      mode: "LIVE", // will block requests. Use "DRY_RUN" to log only
      refillRate: 5, // refill 5 tokens per interval
      interval: 10, // refill every 10 seconds
      capacity: 10, // bucket maximum capacity of 10 tokens
    }),
    detectBot({
      mode: "LIVE", // will block requests. Use "DRY_RUN" to log only
      // configured with a list of bots to allow from
      // https://arcjet.com/bot-list
      allow: [], // "allow none" will block all detected bots
    }),
  ],
});

export async function loader(args: LoaderFunctionArgs) {
  const decision = await aj.protect(args);

  if (decision.isDenied()) {
    if (decision.reason.isRateLimit()) {
      throw new Response(null, {
        status: 429,
        statusText: "Too Many Requests",
      });
    } else {
      throw new Response(null, { status: 403, statusText: "Forbidden" });
    }
  }

  return json({ message: "Hello Arcjet" });
}

export default function Index() {
  const data = useLoaderData<typeof loader>();
  return <h1>{data.message}</h1>;
}

Shield example

Arcjet Shield protects your application against common attacks, including the OWASP Top 10. You can run Shield on every request with negligible performance impact.

import { useLoaderData } from "@remix-run/react";
import { json, LoaderFunctionArgs } from "@remix-run/node";

import arcjet, { shield } from "@arcjet/remix";

const aj = arcjet({
  key: process.env.ARCJET_KEY, // Get your site key from https://app.arcjet.com
  rules: [
    shield({
      mode: "LIVE", // will block requests. Use "DRY_RUN" to log only
    }),
  ],
});

export async function loader(args: LoaderFunctionArgs) {
  const decision = await aj.protect(args);

  if (decision.isDenied()) {
    throw new Response(null, { status: 403, statusText: "Forbidden" });
  }

  return json({ message: "Hello Arcjet" });
}

export default function Index() {
  const data = useLoaderData<typeof loader>();
  return <h1>{data.message}</h1>;
}

License

Licensed under the Apache License, Version 2.0.