Firebase Auth Better Auth

Add Firebase Authentication (Phone SMS OTP, Google Sign-In, Email/Password) to a Better Auth app using the better-auth-firebase-auth plugin. Use when adding phone authentication to Better Auth without Twilio, integrating Firebase Auth with Better Auth sessions, working with the better-auth-firebase-auth package, or deciding between Firebase Phone Auth and Better Auth's built-in phoneNumber plugin.

20 stars 4 forksProductivity & Notes

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add yultyyev/better-auth-firebase-auth --skill firebase-auth-better-auth

Manual install

git clone --depth 1 https://github.com/yultyyev/better-auth-firebase-auth.git /tmp/better-auth-firebase-auth
mkdir -p ~/.claude/skills
cp -r /tmp/better-auth-firebase-auth/. ~/.claude/skills/firebase-auth-better-auth

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# Firebase Auth + Better Auth

`better-auth-firebase-auth` bridges Firebase Authentication identity providers into Better Auth sessions. Firebase verifies the user; Better Auth owns the session, users, and plugins.

**Package:** `better-auth-firebase-auth` — [GitHub](https://github.com/yultyyev/better-auth-firebase-auth) · [npm](https://www.npmjs.com/package/better-auth-firebase-auth)

---

## Decision: Firebase Phone Auth vs Better Auth `phoneNumber` plugin

**Use `better-auth-firebase-auth`** when:
- You want phone auth without setting up Twilio or any SMS provider
- You are already using Firebase in your project
- You want Google to manage SMS delivery, reCAPTCHA, and fraud prevention

**Use Better Auth's built-in `phoneNumber` plugin** when:
- You want no Firebase dependency
- You need a specific SMS provider for compliance or cost reasons

---

## Install

```bash
pnpm add better-auth-firebase-auth firebase-admin firebase better-auth
```

---

## Import paths — CRITICAL

Always split server and client imports. Never import `firebase-admin` into client bundles.

```ts
// Server ONLY (API routes, server components, server actions)
import { firebaseAuthPlugin } from "better-auth-firebase-auth/server";

// Client ONLY (React components, browser code)
import { firebaseAuthClientPlugin } from "better-auth-firebase-auth/client";
```

---

## Server setup (`lib/auth.ts`)

Read the full skill on GitHub

Details

Skill name: firebase-auth-better-auth
Repository: yultyyev/better-auth-firebase-auth
License: MIT
Repo updated: 26 October 2026

FAQ

What does the Firebase Auth Better Auth skill do?

How do I install the Firebase Auth Better Auth skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add yultyyev/better-auth-firebase-auth --skill firebase-auth-better-auth. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Firebase Auth Better Auth popular?

It lives in yultyyev/better-auth-firebase-auth, which has 20 GitHub stars and 4 forks.

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