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better-auth

Integrate Better Auth shared-secret JWT authentication between Next.js and FastAPI.

1|Updated Dec 8, 2025
Search Tags:#security#authentication#fastapi#jwt#better-auth#nextjs
One-click install
npx skills add https://github.com/uneezaismail/hackathon-todo --skill better-auth-uneezaismail
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: better-auth
Source: https://github.com/uneezaismail/hackathon-todo/tree/main/.claude/skills/better-auth
Command: npx skills add https://github.com/uneezaismail/hackathon-todo --skill better-auth-uneezaismail

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill provides a robust and secure authentication system for the Todo application, ensuring that only authorized users can access and manage their tasks.

Core Features & Use Cases

  • Shared Secret JWT Authentication: Implements a simplified JWT authentication flow using a shared secret (HS256) between a Next.js frontend (with Better Auth) and a FastAPI backend.
  • User Data Isolation: Enforces strict user data isolation, ensuring users can only access and modify their own tasks.
  • Use Case: When a user logs into the Todo application, this Skill ensures their session is securely managed, and all subsequent API requests to fetch, create, update, or delete tasks are authenticated and authorized based on their identity.

Quick Start

Implement the Better Auth shared secret JWT integration for the Phase 2 Todo application.

Frequently Asked Questions about better-auth

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I implement JWT authentication between Next.js and FastAPI?▼

To implement JWT authentication between Next.js and FastAPI, use Better Auth with a shared secret to generate HS256 tokens on the frontend and verify them on the backend for secure API access.

Can I use Better Auth with a FastAPI backend for user data isolation?▼

Yes, you can use Better Auth with a FastAPI backend for user data isolation. The symmetric HS256 token verification ensures that authenticated users can only access and modify their own specific tasks.

What is symmetric HS256 JWT signing and when do I need it?▼

Symmetric HS256 JWT signing uses a shared secret to both sign and verify tokens. You need it when a Next.js frontend and FastAPI backend share a secure trust relationship to authenticate users without asymmetric key management.

Does Better Auth support FastAPI integration for secure user sessions?▼

Better Auth supports FastAPI integration by issuing JWT tokens from the Next.js frontend that the FastAPI backend verifies using a shared secret, ensuring secure user session management and authenticated API requests.

How do I enforce user data isolation in a Todo app with JWT?▼

To enforce user data isolation in a Todo app with JWT, verify the HS256 token on your FastAPI backend to authenticate the user's identity, ensuring they can only fetch, create, update, or delete their own tasks.

Why does my FastAPI backend reject tokens from my Next.js frontend?▼

Your FastAPI backend rejects tokens from your Next.js frontend if the shared secret used for HS256 signing and verification does not match, or if the Better Auth token configuration is incorrectly applied.

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