JWT vs API Key – A Complete Comparison
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Both JWT and API Key are used for securing APIs, but they work differently. This guide explains the key differences.
What is JWT?
JWT is a self‑contained token format that holds user claims. It is stateless and verified by signature.
What is API Key?
API keys are simple alphanumeric strings sent via headers or query parameters. They are static and often used for simple access.
Key differences
| Feature | JWT | API Key |
|---|---|---|
| State | Stateless | Stateful (server stores) |
| Security | Signature verified | Simple string, can be leaked |
| Revocation | Hard (until expiry) | Easy (delete key) |
| Use case | Microservices, SPAs | Simple APIs, server‑to‑server |
Frequently Asked Questions
When should I use JWT over API Key?
Use JWT for distributed systems and fine‑grained authorization; use API Key for simple, low‑risk integrations.