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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 TypeScript and JavaScript SDK core.
Visit docs.arcjet.com to get started.
Generally, you'll want to use the Arcjet SDK for your specific framework, such
as @arcjet/next
for Next.js. However, this package
can be used to interact with Arcjet if your framework does not have an
integration.
npm install -S arcjet
The 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.
Bot detection is also enabled to block requests from known bots.
import http from "http";
import arcjet, { createRemoteClient, tokenBucket, detectBot } from "arcjet";
import { baseUrl } from "@arcjet/env";
import { createConnectTransport } from "@connectrpc/connect-node";
const aj = arcjet({
// Get your site key from https://app.arcjet.com
// and set it as an environment variable rather than hard coding.
// See: https://www.npmjs.com/package/dotenv
key: process.env.ARCJET_KEY,
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
}),
],
client: createRemoteClient({
transport: createConnectTransport({
baseUrl: baseUrl(process.env),
httpVersion: "2",
}),
}),
});
const server = http.createServer(async function (
req: http.IncomingMessage,
res: http.ServerResponse,
) {
// Any sort of additional context that might want to be included for the
// execution of `protect()`. This is mostly only useful for writing adapters.
const ctx = {};
// Construct an object with Arcjet request details
const path = new URL(req.url || "", `http://${req.headers.host}`);
const details = {
ip: req.socket.remoteAddress,
method: req.method,
host: req.headers.host,
path: path.pathname,
};
const decision = await aj.protect(ctx, details, { requested: 5 }); // Deduct 5 tokens from the bucket
console.log(decision);
if (decision.isDenied()) {
res.writeHead(403, { "Content-Type": "application/json" });
res.end(JSON.stringify({ error: "Forbidden" }));
} else {
res.writeHead(200, { "Content-Type": "application/json" });
res.end(JSON.stringify({ data: "Hello World!" }));
}
});
server.listen(8000);
Reference documentation is available at docs.arcjet.com.
Licensed under the Apache License, Version 2.0.
FAQs
Arcjet TypeScript and JavaScript SDK core
We found that arcjet demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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