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---
name: auth-skill
description: Implement secure authentication systems including signup, signin, password hashing, JWT tokens, and Better Auth integration.
---
# Authentication System Skill
## Instructions
1. **User Signup**
- Collect email and password
- Validate input fields
- Hash password before saving
- Store user in database
2. **User Signin**
- Verify email exists
- Compare hashed passwords
- Handle invalid credentials
- Return auth response
3. **Password Hashing**
- Use bcrypt or argon2
- Never store plain text passwords
- Apply proper salt rounds
4. **JWT Tokens**
- Generate access token on signin
- Include user ID in payload
- Set token expiration
- Verify token on protected routes
5. **Better Auth Integration**
- Configure Better Auth provider
- Connect with database
- Use built-in session handling
- Secure cookies and tokens
## Best Practices
- Always hash passwords
- Use HTTPS only
- Set short token expiry
- Store secrets in environment variables
- Protect all private routes
## Example Flow
```ts
// Signup
User → Hash Password → Save User
// Signin
User → Verify Password → Generate JWT
// Protected Route
Request → Verify JWT → Allow Access
