JWT Decoder

Securely decode, verify, and inspect JSON Web Tokens (JWT) locally in your browser. No data ever leaves your device.

ENCODED TOKEN

DECODED CONTENT

Enter a JWT token to decode

Privacy First

All decoding happens in your browser. No data sent to servers.

Instant Inspection

View header, payload, and signature instantly

Timestamp Parsing

Automatically converts timestamps to readable dates

What is JWT?

JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs are digitally signed and can be verified and trusted.

JWT Structure:

• Header: Algorithm & token type
• Payload: Claims (user data)
• Signature: Verification hash

Common Claims:

iss - Issuer
sub - Subject
aud - Audience
exp - Expiration Time
iat - Issued At

What is a JWT Decoder?

A JWT decoder parses JSON Web Tokens and displays the header, payload, and signature as formatted JSON. JWTs are used for authentication in OAuth, SSO, and API security. Quickly inspect claims, expiration, and roles without a backend.

Frequently Asked Questions

Does it verify the signature?

No. This tool displays token contents only. Verify signatures server-side with your secret key.

Is it safe to paste my JWT?

Yes. Decoding happens locally in your browser. The token is never sent anywhere.

What are JWT claims?

Claims are data in the payload like iss (issuer), exp (expiration), sub (subject), and aud (audience).