Achive Flawless Authentication with FastAPI & JWT.pdf

Secure. Scalable. Simple. Swipe through to see how FastAPI and JWT redefine authentication for modern applications.

1. Achive Flawless
Authentication with
Securely power your APIs – with
speed, clarity, and best practices
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&

2. Enhances user personalization & experience
Why authentication
matters
Acts independently
Ensures accountability & audit trails
Meets regulatory and trust expectations
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3. Core Auth Flow
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User supplies credentials at
/token endpoint
Validate credentials (e.g.
hash check)
Issue JWT access token
with expiry “exp” claim
Client uses token in
Authorization header
Protected endpoints use
dependency to decode &
verify token

4. Handling Real-World
Concerns
Maintain blacklist to invalidate tokens
before expiry
Allow refresh endpoint to issue new
access tokens
Differentiate what routes/resources are
accessible by users vs admins etc.
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Token revocation
Token refresh
Role-Based Access Control (RBAC)

5. Testing & Common
Pitfalls
Always test: valid token, invalid token,
missing token
Test expiry behavior
Be careful with secret management
Payload size: avoid putting too much
sensitive or large data into JWT
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6. Takeaways / Best
Practices
Use strong secrets + secure signing
algorithm
Keep access tokens short-lived, use refresh
tokens for longer sessions
Include minimal necessary claims in
JWT payload
Implement revocation and proper role checks
Always validate tokens for each request
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7. Implement rock-solid
authentication in your APIs
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