Lucia

Getting started in Express

Installation

Install Lucia using your package manager of your choice. While not strictly necessary, we recommend installing Oslo, which Lucia is built on, for various auth utilities (which a lot of the guides use).

npm install lucia oslo

Initialize Lucia

Import Lucia and initialize it with your adapter. Refer to the Database page to learn how to set up your database and initialize the adapter. Make sure you configure the sessionCookie option and register your Lucia instance type.

import { Lucia } from "lucia";

const adapter = new BetterSQLite3Adapter(db); // your adapter

export const lucia = new Lucia(adapter, {
	sessionCookie: {
		attributes: {
			// set to `true` when using HTTPS
			secure: process.env.NODE_ENV === "production"
		}
	}
});

// IMPORTANT!
declare module "lucia" {
	interface Register {
		Lucia: typeof lucia;
	}
}

Polyfill

If you're using Node.js 18 or below, you'll need to polyfill the Web Crypto API. This is not required in Node.js 20, CloudFlare Workers, Deno, Bun, and Vercel Edge Functions. This can be done either by importing webcrypto, or by enabling an experimental flag.

import { webcrypto } from "node:crypto";

globalThis.crypto = webcrypto as Crypto;
node --experimental-web-crypto index.js

Next steps

You can learn all the concepts and APIs by reading the Basics section in the docs. If you prefer writing code immediately, check out the Tutorials page or the examples repository.

If you have any questions, join our Discord server!