Security
JWT Decoder
Use a JWT decoder to inspect header and payload claims from JSON Web Tokens without leaving the browser.
JWT input
Paste a token to inspect the header and payload claims in a readable format.
Decoded token
Inspect the token segments, copy the payload, and confirm the claims before you use the token elsewhere.
- Status
- Decoded
- Parts
- 3
- Claims
- 3
- Alg
- HS256
Why use a JWT decoder
A JWT decoder helps you inspect the contents of a token without writing code or opening a shell. It reveals the header and payload so you can check claims, algorithms, and other metadata in a readable format.
That makes this page useful for developers and support teams who search for JWT decoder, decode JWT, or JWT parser and want the token inspection workflow to stay simple.
What the decoder shows
The decoder separates the token into header, payload, and signature segments. The header usually shows the signing algorithm, while the payload contains claims such as user IDs, roles, or expiration timestamps.
Seeing those values side by side makes it easier to debug authentication flows, verify copied tokens, and understand how the token is structured before you use it in another environment.
Why signature verification matters
Decoding a JWT is not the same as verifying it. This tool is meant for inspection, so it does not prove that the signature is valid or that the token is trustworthy.
Use the decoder to read the token, then rely on your application or security stack to verify the signature and enforce the actual authentication rules.
FAQ
What does this JWT decoder display?
It displays the decoded header and payload, plus basic information about the token segments.
Does decoding a JWT verify the signature?
No. Decoding only reveals the contents of the token. Signature verification must happen separately in your app or security stack.
Can I inspect JWT claims with it?
Yes. The payload output makes it easy to inspect claims such as sub, name, roles, or exp.
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