JWT Decoding Safely: What a Decoder Can and Cannot Tell You
Understand JWT headers, payloads, claims, and why decoding a token is not the same as verifying a token.
A JWT decoder is useful for inspecting token contents, but it does not prove that the token is trustworthy.
Header and payload
The header describes the token type and signing algorithm. The payload contains claims such as subject, issuer, audience, and expiration.
Signature verification
Verification requires the correct secret or public key. A browser decoder can display claims, but your backend should verify tokens before trusting them.
Handle tokens carefully
Tokens can contain sensitive data. Prefer local tools and avoid pasting production credentials into unknown websites.
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