saas-starter

better-auth: Easy SaaS Auth

Name: better-auth: Easy SaaS Auth
Author: better-auth

Get comprehensive authentication with better-auth. For SaaS founders.

29,046 stars2,682 forksTypeScriptQuality 8/10Updated 7/7/2026100% free · open source

What it does

Better-auth provides a comprehensive authentication system for SaaS applications, handling user registration, login, and authorization in a secure and scalable manner.

Install / run

npm install @better-auth/core

When to use it

•When building a SaaS application that requires secure user authentication and authorization
•When needing to integrate multiple authentication providers, such as Google, Facebook, or GitHub
•When requiring a customizable and extensible authentication system to fit specific business needs

Quick start

1Create a new instance of the BetterAuth class, passing in your application's configuration: `const betterAuth = new BetterAuth({ clientId: 'your_client_id', clientSecret: 'your_client_secret' })`
2Configure the authentication providers using the `betterAuth.providers` object, for example: `betterAuth.providers.google = { clientId: 'your_google_client_id', clientSecret: 'your_google_client_secret' }`
3Implement the authentication flow using the `betterAuth.authenticate()` method, which returns a promise that resolves to an authentication result object
4Use the `betterAuth.authorize()` method to check if a user has permission to access a specific resource or perform a specific action
5Refer to the example configuration file `config.example.ts` in the BetterAuth repository for a complete example of how to configure the library

Ready-to-paste prompt

To authenticate a user with Google, use the following code: `betterAuth.authenticate('google').then((result) => console.log(result))`

Heads up: Make sure to handle errors properly when using the `betterAuth.authenticate()` and `betterAuth.authorize()` methods, as they can throw exceptions if the authentication or authorization process fails, for example: `betterAuth.authenticate('google').catch((error) => console.error(error))`

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