api-authentication
Secure API authentication with JWT, OAuth 2.0, API keys. Use for authentication systems, third-party integrations, service-to-service communication, or encountering token management, security headers, auth flow errors.
- Installs
- 536
- Last 24h
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- Security
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/secondsky/claude-skills --skill api-authentication- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads api-authentication automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
API Authentication
Implement secure authentication mechanisms for APIs using modern standards and best practices.
Authentication Methods
| Method | Use Case | Security Level |
|---|---|---|
| JWT | Stateless auth, SPAs | High |
| OAuth 2.0 | Third-party integration | High |
| API Keys | Service-to-service | Medium |
| Session | Traditional web apps | High |
JWT Implementation (Node.js)
const jwt = require('jsonwebtoken');
const generateTokens = (user) => ({
accessToken: jwt.sign(
{ userId: user.id, role: user.role },
process.env.JWT_SECRET,
{ expiresIn: '15m' }
),
refreshToken: jwt.sign(
{ userId: user.id, type: 'refresh' },
process.env.REFRESH_SECRET,
{ expiresIn: '7d' }
)
});
const authMiddleware = (req, res, next) => {
const authHeader = req.headers.authorization;
// Validate authorization header format
if (!authHeader || !authHeader.startsWith('Bearer ')) {
return res.status(401).json({ error: 'Malformed authorization header' });
}
const parts = authHeader.split(' ');
if (parts.length !== 2) {
return res.status(401).json({ error: 'Malformed authorization header' });
}
const token = parts[1];
if (!token) {
return res.status(401).json({ error: 'No token provided' });
}
try {
req.user = jwt.verify(token, process.env.JWT_SECRET);
next();
} catch (err) {
res.status(401).json({ error: 'Invalid token' });
}
};
Security Requirements
- Always use HTTPS
- Store tokens in HttpOnly cookies (not localStorage)
- Hash passwords with bcrypt (cost factor 12+)
- Implement rate limiting on auth endpoints
- Rotate secrets regularly
- Never transmit tokens in URLs
Security Headers
app.use((req, res, next) => {
res.setHeader('X-Content-Type-Options', 'nosniff');
res.setHeader('X-Frame-Options', 'DENY');
res.setHeader('Strict-Transport-Security', 'max-age=31536000');
next();
});
Additional Implementations
See references/python-flask.md for:
- Flask JWT with role-based access control decorators
- OAuth 2.0 Google integration with Authlib
- API key authentication with secure hashing
Common Mistakes to Avoid
- Storing plain-text passwords
- Using weak JWT secrets
- Ignoring token expiration
- Disabling HTTPS in production
- Logging sensitive tokens
FAQ
What does the api-authentication skill do?
Secure API authentication with JWT, OAuth 2.0, API keys. Use for authentication systems, third-party integrations, service-to-service communication, or encountering token management, security headers, auth flow errors.
How do I install api-authentication?
Run npx skills add https://github.com/secondsky/claude-skills --skill api-authentication in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/api-authentication/ (personal) or .claude/skills/api-authentication/ (project).
Which AI agents can use api-authentication?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is api-authentication safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains api-authentication?
It is published by secondsky in secondsky/claude-skills. It has 536 recorded installs.
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