JWT decoder (header and payload)
FavoriteJWT decoder shows the header and payload of a token so you can debug auth flows. It does not verify the signature. Free and private in your browser.
This only decodes the parts. It does not check the signature — never trust a JWT from a stranger without verifying it on a server.
How it works
- 1
Enter your data
Text, a link, or settings — right on this page.
- 2
Instant result
Everything runs on your device. We do not get a copy.
- 3
Copy or save
Use it right away.
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Fast
You get the result in a second. No waiting in a line.
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Use a JWT decoder without leaving your browser
A JWT decoder helps you inspect claims like exp, sub, and roles while you debug login or API auth. Paste the token and read the header and payload as JSON.
This JWT decoder does not validate the signature. Use it to understand what a token contains, then verify on your server before you trust any claim.
Decoding runs in your browser with no account. Still treat production tokens carefully and prefer local-only workflows when secrets are involved.
Good for
- Auth debugging
- Claim checks
- Expiry inspection
- API token peeks
Tips
- Paste the full three-part token
- Read exp and iss first
- Never trust decoded claims alone
- Verify signatures on the server
Common questions
What does a JWT decoder show?
It Base64-decodes the header and payload so you can read the JSON claims. It does not prove the token is valid.
Does this JWT decoder check the signature?
No. Always verify JWTs on a trusted server. Treat decoded claims as untrusted data.
Is a JWT decoder safe for production tokens?
Prefer local tools for live secrets. This page decodes in your browser and does not upload the token, but avoid pasting prod tokens when you can.
Is this JWT decoder free?
Yes. No account and no daily limit.
How is a JWT decoder different from base64 decode?
A JWT has three parts. This tool splits them and formats header and payload as JSON instead of decoding one raw string.