How do I use the JWT Decoder?

Paste a JSON Web Token into the decoder input. Inspect the decoded header and payload to review claims such as issuer, subject, audience, and expiration. Use the readable output to debug authentication flows or confirm token contents before deployment.

Is the JWT Decoder free?

Yes, the JWT Decoder is completely free. It runs entirely in your browser with no signup, no download, and no data sent to any server.

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JWT Decoder

Decode JWT headers and payloads, inspect token claims, and review signature bytes without sending data anywhere.

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This tool only DECODES tokens. It does not verify signatures.

JWT token

Paste a JWT to inspect its header, payload, and signature bytes.

Token parts

header.payload.signature

Encoded token segments will appear here.

exp

—

iat

—

sub

—

iss

—

Header

Part 1

Decoded header JSON will appear here.

Payload

Part 2

Decoded payload JSON will appear here.

Signature

Part 3

Decoded signature hex will appear here.

How to use

How to Use the JWT Decoder

1 Paste a JSON Web Token into the decoder input.
2 Inspect the decoded header and payload to review claims such as issuer, subject, audience, and expiration.
3 Use the readable output to debug authentication flows or confirm token contents before deployment.

The JWT Decoder lets you inspect JSON Web Token headers and payload data instantly without sending the token to a backend service. It is a useful JWT decoder for developers working with authentication, sessions, and API security.

If you need a JWT parser, a JSON Web Token decoder, or a simple JWT debugger for checking exp, iat, aud, or custom claims, this browser based tool makes token analysis fast and clear.

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