# Authsignal Node.js SDK [](https://npmjs.org/package/@authsignal/node) [](https://github.com/authsignal/authsignal-node/blob/main/LICENSE.md) The official Authsignal Node.js library for server-side applications. Use this SDK to easily integrate Authsignal's multi-factor authentication (MFA) and passwordless features into your Node.js backend. ## Installation Using npm: ```bash npm install @authsignal/node ``` Using yarn: ```bash yarn add @authsignal/node ``` Using pnpm: ```bash pnpm add @authsignal/node ``` Using bun: ```bash bun add @authsignal/node ``` ## Getting Started Initialize the Authsignal client with your secret key from the [Authsignal Portal](https://portal.authsignal.com/) and the API URL for your region. ```typescript import { Authsignal } from "@authsignal/node"; // Initialize the client const authsignal = new Authsignal({ apiSecretKey: process.env.AUTHSIGNAL_SECRET_KEY, apiUrl: process.env.AUTHSIGNAL_API_URL, // Use region-specific URL }); ``` ### API URLs by Region | Region | API URL | | ----------- | -------------------------------- | | US (Oregon) | https://api.authsignal.com/v1 | | AU (Sydney) | https://au.api.authsignal.com/v1 | | EU (Dublin) | https://eu.api.authsignal.com/v1 | ## License This SDK is licensed under the [MIT License](LICENSE.md). ## Documentation For more information and advanced usage examples, refer to the official [Authsignal Server-Side SDK documentation](https://docs.authsignal.com/sdks/server/overview).